Sm-Nd isotopic evidence for the provenance of sediments from the Adelaide Fold Belt and

20 Pages·2002·2.27 MB·English

Geochimica n Cosmochimica Aclo Vol. 57. pp. 1837-1856 0016-7037/93/$6.00 + 03
CopyrigQh t1993 nomagrcP sserP .dtL detnirP ni .A.S.U
Sm-Nd isotopic evidence for the provenance of sediments from the Adelaide Fold Belt and
southeastern Australia with implications for episodic crustal addition
SIMON ,RENRUT * JOHN ,NEDOF EKIM ,DROFIDNAS dna DIVAD ECURB
tnemtrapeD of ygoloeG dna ,scisyhpoeG ytisrevinU of ,edialedA OPG xoB 498, AS 500 ,I ailartsuA
(Received June 19, ;2991 accepted ni revised form October 24, 1992)
nI-tcartsbA ,ailartsuA Late ciozoretorP dna nairbmaC stnemides were detisoped ni snisab demrof
nihtiw naeahcrA ot ylraE ciozoretorP-diM .tnemesab esehT secneuqes were yltneuqesbus demrofed dna
detfilpu yb the naicivodrO-orbmaC nairemaleD ynegorO ot mrof the edialedA dloF .tleB nI gnisu the
edialedA dloF tleB ot address sledom for cirehpsohtil ,noitulove ti si yrassecen ot dnatsrednu the -hcem
smsina of nisab noitamrof dna whether the secneuqes ylerem tcelfer gnikrower of gnitsixe cinotarc lairetam
or fi there were wen latsurc .snoitidda sihT yduts stneserp lacimehcoeg dna cipotosi data no the stnemides
dna tnemesab rocks ot tnemelpmoc gnitsixe data no the nairemaleD suoengi rocks as a snaem of -sevni
gnitagit eseht .snoitseuq
ehT data laever that the diM-naeahcrA ciozoretorP tnemesab rocks of the relwaG notarC evah Nd
detelped eltnam ledom ages hcihw egareva tuoba 2.6 aG dna tNd seulav at 800 Ma ni the egnar 9- ot
42- or at 500 Ma morf 11- ot .82- ehT Late ciozoretorP naedialedA ,stnemides ,revewoh evah na
egareva ledom age of 1.9 aG dna laitini tNd seulav ni the egnar 5- ot - 11. ehT ecneuqes nac eb dedivid
otni tsomrewol esahp-tfir stnemides devired morf noisore of lacol relwaG notarC ,lairetam dna a -bus
,tneuqes ylediw ,detubirtsid esahp-gas-lamreht noitatnemides whose cipotosi erutangis si ton elbitapmoc
htiw the .tnemesab sihT seilpmi that a erom evitimirp or elinevuj ecruos was accessed aiv gninedaorb of
the ecnanevorp .noiger ehT nairbmaC stnemides evah ylthgils redlo ledom ages (2.1 )aG dna rewol eNd
( 9- ot - 13) dna nac eb deterpretni as serutxim of tnemesab dna reworked naedialedA .sutirted
ehT ylraE ciozoealaP yratnemides secneuqes of the nalhcaL dloF tleB ot the east evah cipotosi -moc
snoitisop yrev ekil the htuoS nailartsuA Late ciozoretorP dna nairbmaC .secneuqes yehT evah na egareva
ledom age of 1.85 Ma tub hcum rehgih .O,aN/OZK sihT setacidni that the daerpsediw hcsylf of nretsae
ailartsuA si the tluser of gnilcycer of the Late ciozoretorP dna nairbmaC stnemides yb noisore of the
edialedA dloF ,tleB htiw emos noitacifidom yb the erutxim of the naicivodrO-orbmaC cifam dna cislef
citamgam rocks ni siht .negoro
ruO data tseggus ,lanoiger ,latnenitnocartni latsurc noitulove denibmoc htiw gnilcycer of redlo latsurc
lairetam htiw wen snoitidda morf the eltnam gnirud sisenegoro ,dna ot a ressel ,tnetxe sedosipe of noisnetxe
dna .noitatnemides
NOITCUDORTNI Late nairbmaC-ciozoretorP edialedA dloF tleB htiw the mia
of gniniartsnoc rieht ecnanevorp snoiger dna ybereht gnissessa
MODELS EHT NOITULOVE of the latnenitnoc erehpsohtil
FOR cirehpsohtil noitulove ni siht .negoro
evah two rebmemdne .spmac ehT etats-ydaets ledom -ovda
cated yb GNORTSMRA ( 198 1, 199 1) proposes yrev ylrae earth
EHT EDIALEDA DLOF ,TLEB HTUOS AILARTSUA
noitaitnereffid otni a tnatsnoc emulov tsurc dna detelped
eltnam htiw tneuqesbus lacigoloeg yrotsih yllapicnirp -ni
ehT cinotarcartni edialedA dloF tleB smrof part of eno of
gnivlov .gnilcycer nA evitanretla ,weiv y dbeniatniam ynam
the tsegral dna tseb devreserp Late ylraE-ciozoretorP -maC
workers (e.g., YEWED dna ,YELDNIW 198 ;1 ,ERG~LLA ;2891
nairb dlof stleb ni the .dlrow tI sdnetxe hguorht tsom of the
REYMER dna ,TREBUHCS ;4891 ROLYAT dna ,NANNELCM
htgnel of htuoS ailartsuA htiw tnelaviuqe secneuqes ni -tsew
1985)) si that the stnenitnoc evah nworg ylidaets or -dosipe
me ainamsaT (e.g., ,SMAILLIW 1978) dna ni htron airotciV
yllaci tuohguorht lacigoloeg .emit cinegorO stleb are elbissop
,dnaL acitcratnA (e.g., DRIAL dna GRINDLEY, 1982), gnidael
setis of latnenitnoc noitercca dna growth, dna yllacipyt these
suoirav srohtua (e.g., ,EILLAB 1985 ) ot propose that na -giro
evlovni kciht yratnemides secneuqes yltneuqesbus demrofed
yllani suougitnoc dlof tleb demrof the neht nretsae nigram
gnirud na cinegore tneve gnivlovni msihpromatem dna
of .dnalanawdnoG
.msitamgam gnidiceD whether the noitulove of hcus cinegore
nI htuoS ,ailartsuA naeahcrA ot ciozoretorP-dim cinegore
stleb evlovni fresh snoitidda morf the ,eltnam or ylevitanretla
secneuqes of the relwaG notarC are tnemesab ot kciht -es
ylpmis record latsurc gnikrower si na tnatropmi tsrif order
secneuq of stnemides detisoped gnirud Late ciozoretorP dna
step ni gniniartsnoc tnerruc setabed no latsurc growth .sledom
ylraE nairbmaC emit .sgiF( 1 dna 2). nO eryE ,alusnineP
nI siht ,noitubirtnoc we tneserp lacipotosi dna lacimehcoeg
the naeahcrA ot ciozoretorP-diM rocks ofthe relwaG notarC
data no dna rieht laitnetop ecruos rocks morf the
show a yrotsih detautcnup yb three elpicnirp sedosipe of
msitamgam dna ,noitamrofed desrepsretni yb sdoirep of -des
* Present address: tnemtrapeD of htraE ,secneicS nepO ,ytisrevinU noitatnemi (see WEBB et ,.la ;6891 FANNING et al., 1988,
notliM .dnalgnE dna secnerefer niereht for deliated snoissucsid of relwaG
Keynes, MK7 6AA,
1837
.S Turner te .la
LOCATION MAP
0’
-1 ciozoeafaP nalhcaL ni B
nairbmaC z _& lc”J
enotsneerg stleb ’
l vvvvv G -
ootnamnaK hguorT JJ.~J,)‘. ;V
L
gfenefG xelpmoC
diM-nael ciozoretorP
etaL ciozoretorP lnen,,,
~edf~edA
GIF _ .I Map of nretsaehtuos ailartsuA gniwohs the naeahcrA ot ciozoretorP-diM rekwaG ,notarC the Late ciozoretorP
edialedA dloF ,tleB gnidulcni the nairbmaC ootnamnaK hguorT ni the nrehtuos edialedA dloF ,tleB dna the ciozoeafaP
nalhcaL dloF tleB ot the east. ehT tresni noitacol pam shows the nanawdnoG noitalerroc htiw .acitcratnA
notarC ,yhpargitarts ,spihsnoitaler dna .)ygolonorhcoeg dna yllaretal evisnetxe noitatnemides of the ,arruB -rebmU
elpitluM demrofed sessiengarap were dedurtni yb cifam dna ,anata dna anepliW spuorG si yllareneg deziretcarahc yb
cislef samgam gnirud the 0032-0052 Ma naidrofaelS -gorO wollahs water stisoped dna a lareneg ecnesba of cinaclov
.yne ,yltneuqesbuS the -0281 1580 Ma nabmiK ynegorO -ed .ytivitca
demrof regnuoy stnemides dna citamgam rocks of the noitatnemideS deunitnoc otni the nairbmaC ,dna ni the
nosihctuH puorG dna nlocniL .xelpmoC deweneR cislef nrehtuos edialedA dloF ,tleB the nairbmaC ellivnamroN
,msitamgam ,noitatnemides dna ronim noitamrofed kram puorG stsoh the cifam orurT scinacloV SEBROF( et ,.la ;2791
the emit of noitazinotarc at dnuora 1 580- 1400 Ma (War- NAV DER ,TDLETS 1990). gniylrevO rehtie the naedialedA
nakat tnevE ) . or the ellivnamroN ,puorG hcihw si ylno yllacol ,devreserp
ehT Late ciozoretorP stnemides of the edialedA dloF tleB the nairbmaC ootnamnaK puorG stsisnoc of yldipar -soped
(see ,SSIERP 1987, for )weiver were detisoped ni flehs ot -raen deti ekil-hcsylt stnemides (e.g., ,SSIERP 1987 ). ehT -acretni
flehs stnemnorivne depoleved ni elbaborp cinotarcartni stfir noital of the ellivnamroN puorG htiw ctfam scinaclov dna
ni siht tnemesab .lairetam SNIKNEJ ( 1990), gniwollof sledom the neddus xulfni of the kciht citidibrut secneuqes of the
for the lamreht noitulove of lanoisnetxe snisab ,EIZNEKCM( ootnamnaK puorG tseggus dewener ,noisnetxe dna these
1978), detaler these secneuqes ni the nrehtron flah of the nairbmaC stnemides yam evah neeb detisoped ni a gnipoleved
dlof tleb ot selcyc gniwohs a cissalc Steer’s Head ,ygolohprom tfir ( VON DER ,HCROB 1980). tneceR nocriz gnitad no a -ffut
each gniniatnoc na ylrae ,detcirtser esahp-tfir dedeeccus yb suoeca reyal ni the reppu part of the ellivnamroN puorG
a yllaretal evisnetxe .esahp-gas-lamreht tsuJ gnidecerp the secalp the gninnigeb of siht tsal noitatnemides edosipe at
tseilrae stages of no~t~nemid~ are the c&am sekyd of the 625- Ma (COOPER et at., 1992 f . yreV dipar noit~nemi~
- 1000 Ma rendriaG ekyD ,mrawS tslihw the ,ylrae -etiropave si deilpmi esuaceb the ootnamnaK secneuqes were yltnedive
gniraeb annallaC puorG noitatnemides was deinapmocca yb deirub ot -ol 15 mk depth, desohpromatem dna dedurtni yb
the 009- Ma, tlasab-doolf-latnenitnoc ,elyts anatlooW -loV citinarg samgam yb 5-025 16 Ma ( NEDOF et ,.la .)b3991
scinac DROFWARC( dna ,DRAYLIH 1990). ehT tneuqesbus ehT ,naedialedA ,ellivnamroN dna ootnamnaK -nemides
dN-mS sepotosi morf eht edialedA dloF Belt 1839
etatS Circle elahS
tiewarraD miuG enot&uM
ogidneB elahS riihuqiaB noitamroF g&nelG
attitaknuT noitamroF River
Tappanappa noitamroF
sriatskcaB egassaP Fom
agnilakctnaC noitamroF
amaronE etahS
1
E puorG anitE noitamroF
yelpaT Hill noitamroF
Appila Tillite
rialeB sub-group
annallaC annallaC puorG
retwaG egnaR scinacloV
I
aloocraT noitamroF
0571
$S rogerGcM scinacloV
08
Ec
81
Bmadview tsihcS
az
ra
%2 kooC- paG- tsihcS -
epaG notgnlnn~ etftrius
Waddikee skcoR sessieng-arap
Devils dnuorgyalP scinaclov
tomaC sessienG
FIG. 2. cihp~t~t~ efbat gnitsil the seigolohtil deIpmaS ni siht yduts dna rieht evitaler
yrat secneuqes were yltneuqesbus demrofed yb the -orbmaC relwaG notarC ot the west dna ralimis slairetam ot the -htron
naicivodrO nairemaleD ynegorO ,NOSPMOHT( ;9691 YLIAD east (e.g., ,SSIERP 1987 ) . ,revewoH the ekil-hcsylf stnemides
et ,.la 1976). nI the ylrehtuos exposed snoitces of the dlof of the nairbmaC ootnamnaK puorG are osla the tsom ylhgih
,tleb the nairemaleD ynegorO detluser ni xelpmoc -ylop desohpromatem dna ,demrofed dna siht lausunu erutaef has
phase noita~ofed dna elyts-nahcuB msih~om~m (e.g., yltnecer del ot lacitirc slasiarppa-er of the cinotcet yrotsih of
,WOLETKCNAM 1979; SANDIF~RD et ,.la 1990, 1992). -gaM the dlof tleb dna the noitseggus that the ootnamnaK puorG
citam ,ytivitca tslihw ton ,suonimulov derrucco tuohguorht yam eb suonohthcolla (e.g., ,SNIKNEJ 1986, 1990). -itsevnI
hcum of the yrotsih of the dlof tleb (FODEN et ,.la ;0991 snoitag ni nretsew airotciV RENRUT( et ,.la )b2991 tseggus
TURNER dna FODEN, 1990) morf yratnemides-nys cifam noitalerroc of the cinotcet noitulove of the glenelG reviR
sekyd dna scinaclov gnikram sdoirep of mumixam noisnetxe xelpmoC .giF( 1) htiw that of the ootnamnaK ni htuoS -suA
ot the eham dna cicilis ytivitca cinegore( -I dna epyt-S setinarg .ailart
dna a cinegore-etal ladomib etius of epyt-A setinarg dna citam nairemaleD noitamrofed devlovni gnitsurht dna latsurc
)sevisurtni hcihw dennaps the noisserpmoc of the nairemaleD gninekciht ( ,WOLETK~NA~ ;9791 DROFIDNAS et ,.la 1990).
ynegorO NEDOF( et ,.la ;b,a3991 DROFIDNAS et ,.la ;2991 cihpromateM grades ni the ootnamnaK reach reppu -ma
RENRUT et ,.la 1992a). etilobihp grade htiw lacol tnempoleved of etinamillis-etinayk
ehT Late ciozoretorP naedialedA yratnemides secneuqes .segalbmessa DROFIDNAS et .la ( 1990) showed that these -ruc
evah yllausu neeb deterpretni ot evah neeb devired morf the yltner exposed segalbmessa demrof at dnuora 5-3 rabk ( -ol
1840 .S Turner te al
17 mk depth) aiv noitcevda of heat morf cinotcetnys samgam seitilacol gnidnetxe revo - 1000 mk ni redro ot etagitsevni elbissop
decalpme dnuora 094-025 Ma ( FODEN te ,.la .)b3991 neviG ecnanevorp snoitairav gnola eht .nisab nI ,noitidda a noitceles fo
cifam dna cisfef cinotulp dna cinaclov skcor erew nekat morf eht
that these rocks are exposed at the emas larutcurts level as
naeahcrA dna rewoL ot ~iozoreto~-diM fo eht rekwaG notarC ni
,~~ofednu level-hgih cicilis setinarg dna scinaclov
redro ot eziretcarahc eseht laitnetop ecruos .slairetam lareveS -atem
RENRUT( et ,.la 1992a) dedurtni at 486 Ma NEDOF( et at., stnemides erew osla delpmas morf eht relwaG notarC sa gnieb -op
,)b2991 siht stseggus a dipar gnifoornu ( - 10 )mk of the yllaitnet evitatneserper fo eht egareva cinotarc noitisopmoc at rieht
negoro dna a elbissop nigiro for the evisnetxe naicivodrO emit fo .noitisoped nA eniltuo fo eht tnaveler yhpargitarts si detneserp
ni .giF 2.
etidibrut secneuqes of the nalhcaL dloF tleB (e.g., ,SAC 1983 )
ot the east f .giF I ,1
rojaM dna ecart tnemele snoitartnecnoc erew denimreted yb spilihP
SEVIaEJBO
WP 148 FRX dna “Rb/?3r saw detaluclac morf bR dna rS sesylana
deniatbo morf na dednetxe tnemerusaem .enituor lamrehT noitazinoi
sihT yduts was detaitini htiw the mia of gniniartsnoc lareves
ssam yrtemortceps saw desu ot esylana eht erar htrae stnemele (REE),
rebmemdne sledom for the noitulove of the edialedA dloF
dN dna mS ,snoitartnecnoc dna dN dna rS cipotosi .snoitisopmoc
,tleB these ni nrut gnivah snoitacilpmi for latsurc noitulove ehT snoitartnecnoc erew denimreted no 100 gm fo elpmas hcihw
dna growth .sledom ,yllacificepS do the naedialedA -ides saw devlossid dna dexim htiw a tnemeleitlum EER ro mS74‘-dw‘
yratnem secneuqes ylerem tcelfer gnikrower of the cinotarc recart gnisu FH dna JONH-FH ni a AFP .laiv sihT saw detrevnoc ot
edirolhc gnisu 6N .lCH ,mumydoeN muiramas dna muitnorts erew
lairetam ot the west no eryE alusnineP or was there latsurc
detarapes gnisu a egats-owt noitac egnahcxe nmuloc ,erudecorp -se
growth aiv ,suonorhcnys wen snoitidda morf the ,eltnam ni yllaitnes eht emas sa taht debircsed yb DRAHCIR te .la ( 1976). ehT
hcihw case these eltnam snoitidda yam eb detcelfer ni the gnitluser ,dN ,mS dna rS selpmas erew dedaol otno elbuod eR-aT
cipotosi/lacimehc erutangis of yratnemides ?sutirted -imiS muinehr dna elgnis mulatnat ,stnemalif ,ylevitcepser dna desylana
rof rieht cipotosi snoitisopmoc no a na&nniF TAM 261 dilos ecruos
,ylral does the ootnamnaK puorG tcelfer rehtruf noisore morf
ssam .retemortceps Data skcolb fo net snacs erew run litnu elbatpecca
the ,notarc or gnikrower dna noitisopeder of the naedialedA
nur-nihtiw scitsitats erew deveihca (8-15 skcolb rof rS htiw dexif
?secneuqes ,ylevitanretlA was the ootnamnaK devired morf elbuod rotcelloc dna 15-25 skcolb rof dN htiw elgnis .)rotcelloc llA
a yletelpmoc tnereffid ,ecruos hcus as na ghigreme dnalerof rS dna dN cipotosi soitar erew detcerroc rof ssam noitanoitcarf yb
ot the ?tsae niagA there yam evah neeb latsurc growth -noc gnizilamron rS68/rS*R ot 8.3752 dna dN@‘/dN*‘ ot 0.7219. cipotosI
oitar tnemerusaem srorre detouq ni selbaT 2-6 era naemu2 dna -erp
yraropmet htiw ootnamnaK noitisoped dna siht yam eb -er
noisic no eht dN/mS ecnadnuba soitar si tuoba 0.01% evitaler -ed
detcelf ni sti .erutangis gnikaT a redaorb ,evitcepsrep are -des noitaiv ( I .)ip sknalB derusaem gnirud siht krow erew 2 gn of Sr dna
stnemi morf suougitnoc parts of acitcratnA dna the glenelG 400 gp fo dN dna .mS detceleS selpmas erew desylana rof eht EER
reviR xelpmoC tnelaviuqe ot rehtie the ootnamnaK or the ,aL( ,eC ,dN ,mS Eu, ,dG ,yD ,rE dna fbY yb gnitpada eht elbuod
noitac egnahcxe nmuloc seuqinhcet fo KCORC te .la ( 1984), dna
,naedialedA dna do the evisnetxe naicivodrO etidibrut -es
ssam yrtemortceps sdohtem depoleved yb NUS dna NESB~T ( 1978).
secneuq of the nalhcaL dloF tleB tneserper lairetam eroded
nur-nihtiW oitar evitaler dradnats snoitaived erew ssel naht 0.2%.
off a nairemaleD niatnuom ?egnar muimvdoeN ledom sretemarao deteloed( eltnam dN@‘/dN’41
0.513+iO8, ‘47Sm/‘44N6 0.2157 RU&‘dna ‘43Nd/‘44Nd 0.512638,
fmi?‘ i44Nd 0.1967) era desab no esoht desu yb ED~RABLA dna
.HCAORPPA
LEXUORB ( 1987). A noitalipmoc fo sesylana no sdradnats ni siht
yrotarobal si detneserp ni elbaT .I
gnilpmaS
lacimehcoeG dna cipotosi data nac eb lufrewop ni gnitanimircsid LACIMEHCOEG DNA ClPOTOSI STLUSER
eht secruos fo ,suoengi dna spahrep ot a ressel ,tnetxe yratnemides
.skcor nI eht retal ,esac eht ssentsubor fo eht dN-mS cipotosi ,metsys selbaT 7-2 tneserp the ,rojam trace, dna rare earth tnemele
neve hguorht yratnemides dna cih~omatem ,selcyc selbane ti ot eb sesylana dna the cipotosi data for the selahs dna tnemesab
desu sa a recart fo eht ecruos slairetam fo yratnemides skcor
rocks .delpmas ehT ages detouq dna desu ni the noitaluclac
( HCOLLUCCM dna ,GRUBRESSAW 1978; ERG~LLA dna ,UAESSUOR
of laitini soitar were nekat morf or detalopartxe morf data
1984; RELLIM te ,.la 1986). hguohtlA noituac tsum eb desicrexe ni
noitaterpretni ,.g.e( ARNDT dna GOLDSTEIN, 1987; RELLIWWA dna nevig yb BBEW et .la (1986), GNINNAF et .la (1988), or .R
,KCAM 1991), ni lareneg eht dN/mS dna dN“‘/dN’I soitar fo a tnilF ( .srep ).nummoc for the relwaG notarC selpmas elbaT(
yratnemides kcor tcelfer eht egareva fo eht ecruos skcor ni sti -evorp 2) dna dezirammus ni SSIERP ( 1987) for the naedialedA -des
ecnan ,noiger tslihw sti dN detelped eltnam 1edom ega TDM stcelfer
.stnemi ehT ootnamnaK selpmas were nekat ot eil neewteb
eht egareva emit fo eht noitarapes fo siht enarret morf eht ,eltnam
,.e.i sti latsurc ycnediser emit ,.g.e( HCOLLUCCM dna ,GRIIBRESSAW 526 Ma, the age of scinaciov ni the reppu eliivnamroN puorG
1978). selahS era yllausu desu ni eseht seiduts ,esuaceb gnieb llew (COOPER et ,.la 1992 ) , dna 5 16 Ma, the age of the nairemaleD
dexim dna ,latsid yeht era ylekil ot edivorp a doog egareva gnilpmas nejhtaR ssienG ( FODEN te ,.la 1992b). ,cipotosI ,lacimehcoeg
fo a ecnanevorp .noiger gnitcirtseR eht yduts ot selahs yam pleh ot
dna lacigoionorhcoeg data rof emos evitatneserper -remaleD
diova eht stceffe fo yratnemides gnitros dna noitanoitcarf debircsed
nai evisurtni skcor era nevig ni elbaT 5. nA evisnetxe -oeg
yb FROST dna WINSTON ( 1987), NANNELCM te .la ( 1989) dna OAHZ
te ,la ( 1992). ,y~nidro~~A sa a snaem fo gnilkcat eht snoitseuq -erp lacimehc dna cipotosi data esab si won elbaliava for these
ylsuoiv ,deniltuo ew evah detceles a seires fo hcir-elahs stnemides rocks dna lanoitidda data nac eb dnuof ni FODEN te .la ( t 990;
morf eht naedialedA dna ootnamnaK secneuqes sa llew sa lareves 1993a,b), TURNER (1991), dna TURNER te ,.la (1992a).
morf eht glenelG reviR ,xelpmoC ,acitcratnA dna eht ylraE ciozoealaP
etidibrut secneuqes fo eht nalhcaL dloF tleB rof dN-mS .sisylana
ehT ecnerrucco fo na tcapmi atceje noziroh nihtiw eht ooreynuB naeahcrA tnemesaB
noitamroF ehtfo naedialedA ecneuqes (GOSTIN te ,.la 1986) sedivorp
a euqinu enilemit nihtiw na evisnetxe yratnemides ,noita~of dna htoB citam setilunarg dna zOiS-hgih cislef sessieng were
os selpmas erew nekat 40 mc woleb eht atceje noziroh morf ruof delpmas morf the drofaelS xelpmoC no nrehtuos eryE -neP
dN-mS sepotosi morf the edialedA dloF tleB 1841
alusni .giF( 1) gnola htiw two sessiengarap dna selpmas of tNd 9.2+ dna yllamrehtordyh deifidom laitini r%81rS“
desohpromatemnu etiloyhr dna .tlasab nI ,latot these selpmas 0.7029 tslihw eno morf the anatlooW scinacloV has eNd + 1.5
enifed a egnar ni laitini rS”8frS“ of 3417.0-1996.0 htiw the dna laitini 87Sr/86Sr 0.7 153. A seires of selahs were delpmas
erom emertxe selpmas ylbissop gnitcelfer tneuqesbus -ibom morf the htron lartnec dna nrehtuos edialedA dloF tleB
noitazil of bR dna Sr. tNd seulav are erom ,detcirtser gnignar hguorht the ruof elpicnirp snoisividbus of the naedialedA
morf 2.4+ ot 2.6- .giF( 7) htiw Nd detelped eltnam ledom :metsyS the annallaC ,puorG arruB ,puorG anatarebmU
ages ( MDT ) gnidnetxe morf 2.6 ot 4.1 .aG Rare earth snrettap ,puorG dna anepliW puorG .giF( 2). snoitairaV ni the klub
for the cislef sessieng dna the ssiengarap are LREE dehcirne rock rojam dna trace tnemele yrtsimehc ylegral tcelfer -fid
dna HREE detelped dna the cislef ssieng has a evitagen uE secneref ni rieht dnas/elahs oitar dna htiw few snoitpecxe
ylamona ( .giF 3 ) . ehT cifam ,etilunarg ni ,tsartnoc has a talf (e.g., MgO, hcihw senilced tuohguorht the naedialedA -es
REE nrettap htiw rehgih HREE stnetnoc naht the .sessieng ecneuq dna was yllaitini thguoht ot tneserper a gniyaced -lov
ehT llarevo yrtsimehc of these selpmas yltnerappa sreffid morf cinac ,)noitubirtnoc there are on tnerehoc .sdnert nI ,lareneg
the debircsed-llew naisiweL naeahcrA of dnaltocS REVAEW( the naedialedA shows etiuq evitimirp tNd htiw a ,dnert -ed
dna ,YENRAT 198 1) ni that the selpmas desylana here show gnisaerc htiw age, morf 4.4- ot - 10.8. ehT annallaC puorG
na ecnesba of evitisop uE seilamona dna on noitelped of ,K selpmas (cNd 8.8- dna - 10.6) dna the alippA etilliT morf
,bR ,hT dna .U the anatarebmU puorG (eNd )5.8- depart morf siht dnert
ot erom evitagen tNd seulav .giF( 7). detelpeD eltnam ledom
ages eil neewteb 1.8 dna 2.2 aG htiw a naidem of 1.9 .aG
diM-ylraE ciozoretorP tnemesaB
htiW the noitpecxe of emos of the redlo ,selahs laitini 87Sr/
ciozoretorP-ylraE rocks, gnirevoc a egnar of snoitisopmoc 86Sr si ssel elbairav naht for the tnemesab rocks, gnigareva
morf citlasab hguorht ot ilakla ,etinarg were delpmas morf dnuora 0.7195. ehT rare earth snrettap for the naedialedA
the nosihctuH puorG dna nlocniL xelpmoC of eryE -nineP selahs show a elbakramer ycnetsisnoc of shape egareva( La/
.alus selpmaS of the Cook paG tsihcS dna weivdaorB tsihcS NbY 10.6) dna etulosba ecnadnuba .giF( 5), yllaitnesse -ni
were dezylana as laitnetop latsurc segareva for the ylraE -orP elbahsiugnitsid morf those for the -ylraE ot ciozoroetorP-diM
.ciozoret htiW the noitpecxe of a citlasab ekyd morf Cape .giF( 3).
notgninnoD dna the weivdaorB tsihcS (cNd 4.7- dna ,)5.7- ehT CNd cipotosi stluser no the ruof selpmas nekat morf
these selpmas evah yletaredom evitimirp Nd cipotosi -rahc the ooreynuB noitamroF woleb the atceje noziroh are detsil
scitsiretca ( ENd 4.2 ot ;4.3- TDM 1.9-2.8) .giF( 7). laitinI ni elbaT 4 ,dna for the dN-mS ,metsys show tsomla on -irav
87Sr/86Sr seulav are ylhgih elbairav dna ton detalerroc htiw noita of tNd nihtiw error ( 5.0- 6 .)stinu muimydoeN ledom
tNd, gnitcelfer ylhgih elbairav rS/bR soitar eud ot tneuqesbus ages yalpsid erom ,noitairav gnidnetxe morf 1.9 ot 2.2, hguoht
.noitazilibom ehT rogerGcM dna relwaG egnaR ,scinacloV siht si ton detalerroc htiw elpmas noitacol dna tsom ylbaborp
the annuroC ,etaremolgnoC dna a elahs morf the aloocraT stcelfer the noitagaporp of llams errors ni the dN44‘/mS74‘
noitamroF tneserper the ciozoretorP-diM htiw eNd seulav .oitar laitinI r%8frS“ segnar morf 0.7 143 ot 0.7342.
gnignar morf + 1.2 ot 8.3- dna TDM 3.2-0.2 .aG Rare earth
snrettap for the -ylraE ot ciozoretorP-diM selpmas .giF( 4)
Lower ciozoealaP
show a elbakramer ,ycnetsisnoc gniredisnoc the snoitairav ni
ygolohtil dna klub yrtsimehc (see elbaT 3 ). yehT reffid morf A cihpargitarts noisseccus of selahs was nekat hguorht the
the naeahcrA selpmas ni that yeht kcal HREE noitelped dna nairbmaC ellivnamroN dna ootnamnaK spuorG morf the
neve the cifam selpmas are .dehcirne-EERL nI etulosba nrehtuos edialedA dloF tleB dna ooragnaK .dnalsI etipseD
secnadnuba dna shape, these selpmas are yrev ralimis ot those the worran emit lavretni of rieht noitisoped (526 ot 5-025 16
delipmoc yb ROLYAT dna NANNELCM ( 1985) gnidulcni rieht Ma), these selpmas yalpsid a elbaredisnoc egnar of CNd seulav
naeahcrA-tsop egareva elahs ( .)SAAP 4.9-( ot )4.31- hcihw are, ni ,lareneg erom evitagen naht
those for the naedialedA .giF( ;7 elbaT 5). laitinI 87Sr/86Sr
segareva 0.7 167, rewol naht that for the ,naedialedA whereas
Late ciozoretorP gnidulcnI naedialedA
TDM show a ralimis egnar morf 1.9 ot 2.2 aG tub htiw a
tnemecalpmE of the rendriaG ekyD mrawS dna noitpure rehgih naidem of 2.1 .aG nI smret of rieht rojam dna trace
of the anatlooW ,scinacloV dna ,stnelaviuqe preceded dna tnemele ,yrtsimehc the nairbmaC selahs yalpsid ssel noitairav
deinapmocca the tesno of naedialedA ,noitatnemides -er naht those of the .naedialedA sihT si detcelfer ni the rare
.ylevitceps A elpmas morf the rendriaG ekyD mrawS has earth snrettap for these nairbmaC selahs .giF( 6) hcihw show
BCR-I 46.43 322.1 28.63 6.54 0.704951 is4 0.512507 s?4
BHVO-I 9.24 3% 25.08 6.17 0.703469 i86 0.512964 MS
SRM 987 0.710183 zt37
La Jolla 0.511846f30
1842 .S Turner te .la
Sk&rd Skford Slqfwd Sle+wd A?Ch&lll Alch&?m ArcLoran AlCkW
Colnplu ConplU Carlplrr C-b Waddikec Rock
JC3 Ublzs6 446lF30 446NX42 DPA DPB 603lRS60 6131RSl4
r.mdite
lrvogrviss Au8etm 8ni.u Bon’c 8mulite Basic Rhyolite BWolr PorqSiUiSS POragMiSS
cape ccrma cqn cmw cape emnot cqn clmot DCUiLc DCVilS W Eyre Pen KiWlb4
Pl-V8r-d Pkryg=-d
2837 2643 2640 2640 2525 252s 2400 2400
2OiS 51.67 70.08 47.54 96.05 73.15 58.13 73.24 65.16
2oiT s20 0.64 2.67 0.84 0.33 1.36 0.27 0.84
Al203 12.87 14.97 13.03 14.57 12.45 15.43 14.30 16.06
Fe203 1.77 3.59 17.n 12.94 425 11.01 2.45 5.40
OIIM 002 0.04 0.26 0.21 006 0.16 0.02 0.05
Me OdO 2oa 6.83 7.17 1.53 5.50 0.69 1.75
0it 2.02 1.32 10.04 11.76 0.83 0.78 1.16 2.41
0t&N 3.75 279 1.64 0.94 3.69 4.01 3.24 3.32
K20 2.31 5.50 0.25 0.65 1.66 0.49 4.62 4.46
P205 0.03 0.09 1.09 0.06 0.05 0.26 0.09 0.22
I)u 0.33 0.15 -0.54 -0.01 2.31 3.58 0.27 0.48
latoT 100.50 101.25 100.58 100.42 13.ool 100.7 1 53.ool 100.15
Cr 398 434 223 368 146 39 240 209
iN 11 21 65 87 5 12 29
CS 4 6 42 43 ai 9
V 17 60 460 278 10 140 27 106
Pb 14.9 40 3 6.6 4.5 4.9 31 27
bR 43.0 126.0 52 19.1 45.9 13.6 177.1 138.0
rS 135.0 140.0 61.4 80.4 48.2 77.6 59.6 w2.7
Ba 503 664 317 203 503 145 415 1331
¶.G 13 19 20 17 15 18 17.6 21
Nb 6 7 17 4 12 12 13
zx 171 275 170 51 300 166 135 1%
Y 10 16 60 24 45 30 12 .n
7h 11 52 11 4 32 i;
U 0.2 2.3 0 0.7 1.8 0.6 14.4 0
aL 39 aa 37 1 28 23 s2 52
Ce 70 215 70 17 59 36 61 130
Nd 17.12 40.24 28.8) 8.34 26.46 28.56 29.37 32.62
mS 2.64 6.78 7.49 2.32 6.09 5.93 5.46 6.59
rS6alrS78 0.74320 3i 0.79880 t.2 0.71321 ltz 0.73215 k7 0.78548 7f 0.72266 bf I o. 3&21 M 7f91747.0
87RbPXr 09.225 2.6066 0.1869 0.67 11 2.7580 0.5076 8.6046 1.3209
rShE/rS78 (I) 0.70528 0.69912 0.70708 0.70651 0.68480 0.70414 0.71430 0.70140
TSr (DM) 3.2 2.6 4.9 3.2 2.1 2.9 2.5 2.4
dN441ldN341 82f619015.0 0.510933 82t 0.511981 62i 0.511820 62f 0.511528 63f 0.511589 7it 0.511377 k20 0.511235 73f
dN4411mS741 0.0933 0.1019 0.1572 0.1679 0.1392 0.1255 0.1124 0.1221
&Nd (1) 4.2 -1.0 0.6 -6.2 -3.0 2.7 0.6 -0.3
TNd (DM) 2.7 2.9 2.9 4.1 3.1 2.6 2.8 2.8
selpmaS 45ZW4,3CJ m/644 and 4461c142 morf eit noitcelloc fo gninnaF (1975).
neve ssel noitairav naht those for the naedialedA .selahs ehT nos enarreT of North airotciV ,dnaL acitcratnA elbaT( 6).
egareva m/aL (13.9) si ylthgils rehgih naht that for the eerhT selahs morf the glenelG reviR xelpmoC evah ralimis
,naedialedA hguoht llarevo htob the naedialedA dna -maC klub rock dna epotosi yrtsimehc (at 527 :aM tNd 5.8- ot
nairb selahs evah ralimis ,snrettap ,secnadnuba dna llams I- ;0.1 TDM 2-8.1 ;aG laitini *‘Sr/‘%r 0.7 199 ot 0.7261)
evitagen uE .seilamona tslihw two Late ciozoretorP selpmas morf the nosliW enarret
selpmaS morf the ekil-hcsylf etidibrut secneuqes of the evah (at 600 Ma) tNd 2.7- & ,0.8- TDM 1.7 & 1.9 aG dna
nalhcaL dloF tleB gninnaps the reppu ,nairbmaC the rewol laitini *‘Sr/%r 0.7129 & 0.7142.
dna reppu ,naicivodrO dna the nairuliS evah CNd 8.8-( ot
- 11.1) ralimis ot the selahs morf the edialedA dloF .tleB ehT
NOITATERPRETNI DNA NOISSUCSID
REE ,nrettap denimreted no the ogidneB elahs shows greater
tnemhcirne-EERL naht the nairbmaC selahs elbaT( 7, .giF
ehT stluser ylsuoiverp nevig etacidni that the rS-bR cipotosi
6). detelpeD eltnam ledom ages are -8.1 1.9 aG tslihw laitini
metsys has ton deniamer debrutsidnu ni the naeahcrA dna
rS?‘*/rS‘* for these selpmas (0.7 7.0-231 17 1) si ylthgils rewol
emos of the -ylraE dna ciozoretorP-diM rocks dna si ton
naht the egareva for the nairbmaC of the edialedA dloF .tleB
detalerroc htiw the dN-mS .metsys sihT si tsomla niatrec ot
eb the case htiw the stnemides eud ot the laitnereffid lacimehc
Glenelg River Complex and Antarctic Samples
ruoivaheb of the dN-mS dna rS-bR smetsys (e.g.,
~LDSTECIN,
emoS yranimilerp data were detcelloc no stnemides morf 1988 ) ,eroferehT eud ot sti greater ,ssentsubor hcum of the
the glenelG reviR xelpmoC ni nretsew airotciV dna the -liW gniwollof noissucsid si detcirtser ot the dN-mS cipotosi -sys
dN-mS sepotosi morf eht edialedA dLoF tleB 1843
’1 . ‘. n . I n ’ ” ( . ”
La eC dN mS Eu dG DY rE by
.GIF 3. dezilamron-etirdnahC erar htrae snrettap rof detceles naeahcrA :seigolohtil cifam etilunarg nepo( ;)serauqs
ssiengarap dellif( ;)sdnomaid negua ssieng dellif( .}serauqs
0001 L I
Early-Mid ciozoretorP
11 I‘
.‘. c * I‘,“ ’ n * 8
La eC dN Sm uE dG DY rE Yb
.GIF .4 dezilamron-etirdnohC erar htrae snrettap rof detceles -ylraE dna ciozoretorP-diM :seigolohtiI weivdaorB
tsihcS nepo( )sdnomaid ; citlasab ekyd dellif( ;)serauqs alkali etinarg dellif( ;)sdnomaid aloocraT noitamroF elahs
dellif( ;)selgnairt enehtsrepyh-orref etinarg nepo( )serauqs _
1000 1
Late Proterozoic )naedialedA(
1
La eC Nd mS Eu Gd DY rE Yb
.GIF 5. dezilamron-etirdnohC erar htrae snrettap rof detceles naedialedA :selahs annallaC sdeB etitoib dellif(
;)serauqs Burra puorG elahs nepo( ;)serauqs alippA etilliT dellif( sdnomaid ;) anitE noitamroF elahs nepo( ;)sdnomaid
anihcarB noitamroF elahs dellif( )selgnairt _
1844 .S Turner et .la
elbaT 3. iacinahcoeG aad cipotosi anal- fo kwaG crsuo0 diM-y&E Proterozoic bwanent
yhpmgita?ts I!iwdn nlocniL Lhcdn Liwl~ Hutchinra pG >Htuchi.ucn pG
COmprU x?+oC bpnoC Complex kooC Gq Schist weivdah tsihcS
Smplr 8 1028-SIS 515626 5156143 251B-s15 939-w-13 74ISR1316
ygodhtiL Ltirano&aizt citdsaB hyd htm&-eF tG idklA Qia?g tsihcS tsihcS
ytilaxL. notgninnoD .P not~ninmcD .P aotgaimmD .P notqiuwkL .P ndcniL nlocniL
69.55 52.89 73.56 77.01 61.85 61.89
0.80 0.80 0.87 0.07 0.69 0.85
3021A 14.78 15.13 14.92 11.88 15.76 15.71
Fe203 9.93 10.67 6.09 W.l 8.07 8.23
MnO 0.15 0.17 0. OI 0.03 0.18 0.15
OgM 5.95 7.04 1.57 0.18 2.92 1.97
cao 6.94 9.88 3.37 0.74 0.66 1.05
Na20 2.47 2.41 2.98 3.03 182 3.68
K20 221 1.13 4.43 5.20 4.12 4.50
P205 020 0.19 0.24 0.00 0.13 0.18
aL 0.44 a.10 0.09 0.22 2.42 2.08
latOT 99.83 100.27 30.ool 99.40 99.22 100.29
Cr 575 345 16 204 159
iN lli 79 22 11 s3 50
CS 29 35 bl 12 18
V 157 228 58 96 154
Pb 15 6.4 26.4 48.6 1101 5.H
bR 102.0 28.0 201.0 413.0 229.2 181.1
rS 231.0 318.0 171.0 12.0 4.96 109.0
Ba 0OS 72a 885 6 542 1126
Ca 16 6.4 17.4 16 26 19
b-h 12 17 6 17 13
% 168 113 2w 118 193 177
31 26.1 47 52 36 21
bT 8 2.2 i.I” 36 24 12
IJ 7.6 0.5 9.4 13.3 6.1 2.9
al 38 24 95 39 50 fi
Ce 74 51 3iv 74 93 53
Xd 28.80 23.30 09.05 33.80 37.48 14.29
mS 5.68 4.48 85.9 5.74 86.tf 3.05
87w8bSr 0.73871 *5 0.71087 3f 0.79506 4f 4.35480 4f o.w741 6f 0.80340 bf
rSbSlbR78 1.2789 0.27 15 3.4043 99.4714 9.5653 4.8119
rSb8/rS78 (I) 0.70381 0.70364 0.70580 1.75055 0.69280 0.67882
TSr (D&4) 2.0 2.4 1.9 2.5 1.8 1.5
143Nd1144Nd 0.511518%24 31f482115.0 0.511469 31f blf827115.0 0.511405 l3k 74fbS41lS.O
dN441/mS741 0.1194 0.1163 0.1139 0.1027 0.1077 0.1292
eNd (1) -3.0 -7.4 “3.4 4.2 -2.9 -7.5
TNd (DM) 2.5 2.8 2.4 1.9 2.4 2.9
selpmaS 515-B201,515-B26,515-B143 and 515-B152 morf etIt noitcelltu fo Mceimer (1984)
,nret ni ralucitrap the tNd noitulove margaid ni .giF 7. -lA or evoba the klub earth dna detelped eltnam sevruc gnitacidni
hguoht ti was detpmetta ot tcirtser the gnilpmas ot hcir-elahs yeht yam eb ylegral eltnam devired dna that eltnam devired
,stnemides ti si raelc morf the rojam tnemele yrtsimehc -aT( msitamgam was ylbaborp tnatropmi gnirud siht doirep of
selb ;6-2 elbaT 7) that emos of the selpmas niatnoc a -gis relwaG notarC .tnempoleved ehT gniniamer three selpmas
tnacifin dnas .tnenopmoc ,revewoH a kcal of noitalerroc -eb evah yltnacifingis evitagen ENd, hcihw setacidni that yeht
neewt zOiS dna eNd, or TDM dn a dN44‘/mS74‘ was ,deton niatnoc a rojam tnenopmoc of delcycer redlo latsurc .lairetam
gnivig su ecnedifnoc that the dN-mS cipotosi scitametsys of ehT dN44’fmS74r ,oitar desu ot enifed a emit yrotcejart enil
these selpmas were ton detceTIa yb yratnemides gnitros ni for each ,eipmas stluser ni a set of senil gninifed na epolevne
the rennam devresbo yb TSORF dna NOTSNIW ( 1987) or gniwohs the noitulove-emit of the% naeahcrA selpmas as a
OAHZ et .la ( 1992 ) . eW etartnecnoc ruo gniwollof noissucsid .puorg sihT epolevne .giF( 7) si neht nekat ot tneserper the
no ENd seulav esuaceb the desaercni noitalopartxe dnoyeb ylekil egnar of cNd seulav for the naeahcrA tnemesab at yna
laitini cNd ot evired TDM lliw yfingam yna errors ni the /mS’4r ralucitrap .emit
‘44Nd .oitar ehT egnar of CNd seulav for the -ylraE ot ciozoretorP-diM
selpmas sdnetxe morf ralimis ot the detelped eltnam CNd ot
Nature of the South Australian Archaean and Proterozoic etiuq evitagen seulav for the weivdaorB tsihcS dna a -atem
Basement citlasab .ekyd ,revewoH htiw the noitpecxe of these two retal
ehT naeahcrA selpmas egnar of laitini eNd seulav are morf ,seigolohtil lla of the gniniamer seigolohtil tolp edistuo dna
2.4+ ot 2.6- .giF( 7). eviF of the thgie selpmas eil esolc ot evoba the naeahcrA epolevne at that .emit sihT nac eb -ni
dN-mS sepotosi morf the edialedA dloF tleB 1845
elbaT 3. )deunitnoC(
,,,&,e&S? Vdc McGraga WC Pm-A&f&dean Tmoda Fm GRV Goirdwr mkyD
Ya&o
2GM 4Gfb 11-W-939 41-09-939 01YW&
R.927
Bardt Rhpdocite C0l8glCWUM shale DOCd.2 Dderite
CavMn CCTrvW CLWVW Wilgetm-I Chder Rages SQwi sheij
1740 1740 1700 I654 1592 I&70
44.74 65.59 68.71 7250 20.B6 so.55
1.06 0.77 0.45 0.40 0.67 1.57
14.57 14.82 15.33 1224 13.68 12.44
11.78 5.29 328 4.18 5.10 G.53
0.21 0.13 0.03 0.04 0.14 0.31
36.8 1.56 1.48 1.64 0.57 7.95
12.12 2.17 0.19 0.61 2.03 10.99
2.30
2.56 1.06 0.99 3.29 1.77
O.&Q
5.57 5.38 3.37 5.19 0.18
0.29
0.23 005 0.08 0.17 0.10
0.51 0.10 3.16 4.33 0.95 0.48
99.75 99.39 99.12 100.38 99.81 99.87
756 13 22 88 5 216
262 7 12 20 3 89
33 15 8 1.5 44
225 53 3s 41 20 3.56
B 17 35 16 26
53.7 238.2 235.0 161.7 208.4 6.7
662.0 218.0 70.4 36.1 165.6 154.6
183 887 846 585 1410 27
16 19 16 I5 21 22
13 16 15 13 21 5.1
91 305 210 144 432 87
24 43 35 29 66 28
4.7 20.3 13 16 31
4.5 4.3 2.7 85
39 61 45 41 48 6
75 134 89 76 871 18
33.46 55.53 37.90 26.61 25.86 10.70
5.15 9.83 6.87 4.94 13.07 3.29
0.71011 f9 0.78493 f3 0.92249 f4 0.99480 f9 0.78767 .t9 0.70579 f5
2.3495 3.1619 9.6606 12.9818 3.6441 0.12s3
0.65 133 0.70584 0.68644 0.68629 0.70435 0.70299
0.2 1.8 1.6 1.6 1.6 1.4
0.511418f16 0.511440 f31 0511755 f18 0.511679k20 0.511593 f33 OS12714k25
0.0926 0.1070 0.1124 0.1121 0.1154 0.1860
6.0- -3.4 1.2 -0.8 -3.8 2.9
2.1 23 2.0 2.1 2.3 2.0
terpreted ni two :syaw rehtie there stsixe erom yllacipotosi Origin of the Adelaidean
evitimirp naeahcrA rocks morf hcihw the -ylraE ot -orP-diM
ciozoret seno were ,devired or ,ylevitanretla tsom of these
fI the naedialedA stnemides were ylpmis devired yb noisore
rocks niatnoc htob a delcycer naeahcrA dna a eltnam -moc
of relwaG notarC ,lairetam yeht dluow eb expected ot eil
.tnenop fI the rettal sisehtopyh si correct, neht the -ylraE ot
nihtiw the ENd egnar denifed yb the naeahcrA dna -ylraE ot
ciozoretorP-diM tnempoleved of the relwaG notarC osla -ni
ciozoretorP-diM ;sepolevne tub noitcepsni of .giF 7 shows
devlov tnacifingis eltnam .tupni troppuS for siht seil ni the
siht si ton the case ehT ytirojam of the selahs evah rehgih
ecnetsixe of htob ciiam sevisurtni dna scinaclov nihtiw siht
eNd gniyl evoba the tnemesab ,sepolevne hguoht two selpmas
.yhpargitarts nA epolevne gnibircsed the noitulove of the
-ylraE ot cioz~~o~-dE selpmas si denifed ni .giF 7 ,dna morf the annallaC puorG dna the naitrutS etilliT evah erom
eud ot the yllareneg rewol /mS74‘ ‘43Nd of these ,selpmas siht evitagen CNd dna do eil nihtiw the tnemesab sepolevne .giF(
epolevne stcesretni dna ylegral spalrevo the naeahcrA eno 7). erugiF 8a shows siht ni liated dna osla shows that a ralimis
after the Late .ciozoretorP nrettap si devresbo for the TDM ages hcihw are tsehgih for
tnemesaB areas osla porctuo ot the tsaehtron of the -edA the annallaC selpmas 1.2-2.2( )aG tub yldipar drop ni the
edial dloF tleB at .tM retniaP dna nekorB ,lliH dna ni noitidda arruB puorG ( - 1.8 ,)aG dna neht esir morf 1.8 ot 2.2 aG
meht are sreilni nihtiw the dlof tleb flesti ,revewoH the detimil hguorht the gniniamer naedialedA ecneuqes htiw the naitrutS
dehsilbup data no these rocks ( ,HCOLLUCCM 1987) etacidni etilliT niaga gnimrof na .ylamona ylbatoN these ledom ages
yeht are yldaorb ralimis ot the relwaG notarC sesylana -erp are yIlareneg regnuoy naht those for the tnemesab (see -aT
detnes here. elb 4).
1846 .S Turner te .la
is 50.49 49.38 49.96 49.46 80.56 88.96 46.55 56.37
l-m l.n 0.49 0.92 0.84 1.25 0.75 0.90 0.78
Al203 13.81 18.98 14.84 14.77 10.99 13.26 13.35
Fe203 1267 4.61 7.61 6.35 4.92 6.33 6.14
0.25 O.Cn Cl)1 0.02 0.00 0.06 0.08
E 8.16 1252 12.20 355 3.04 4.39 6.71 3.93
4.25 6M 0.12 0.36 0.12 1.01 3.82 6.03
lW!O 4.38 039 0.68 1.16 1.14 0.26 1.61 1.54
KZO 0.63 3.61 8.n 321 4.06 3.12 2.85 293
P24x 0.14 0.10 0.07 0.18 0.11 0.11 0.19 0.16
LO1 282 12.63 2.11 4.12 3.62 4.39 8.33 8.51
TOW 99.37 99.67 98.50 100X? 99.36 99.82 99.70 99.82
Cr 203 60 136 121 72 97 99
Ni 114 29 48 63 62 14 44 35
SC 47 11 21 14 16 12 15 16
V 297 73 168 215 135 91 la6 137
m 3.9 0 31 12 11.2 29 20
Rb 25.0 66.2 336.4 145.8 186.5 119.7 114.4 122.4
Sr 141.9 38.4 43.3 36.3 76.8 25.3 179.6 105.7
Ba 79 289 loaD 651 360 321 481 384
Ga 21 11 23 18 19 12 16 16
W 6 10 17 12 16 13 13 13
z.r 10s 128 161 1Sl 235 280 173 181
Y 28 18 32 31 38 26 29 30
nt 7 8 8 18 11 8.8 10
U 3.1 u’ n 3.3 3.6 3 4.4 3
L 9 19 29 42 32 40 38
Ce ?A 38 42 62 83 73 73 76
Nd 15.60 16.89 8.62 29.62 39.57 26.11 32.66 29.76
Sm 4.33 327 1.63 6.1s 7.86 5.27 6.56 5.95
87Sri86Sr 0.72189 k.5 0.77728 fs 0.84297 i5 0.81517 f5 0.77533 f7 0.85421 f5 0.13879 f6 0.74678 f4
87RW6Sr 0.5099 4.9933 22.5259 11.6381 7.3211 13.7161 1.8451 3.3530
I
87w86Sr 0) 0.71533 0.71665 0.56947 0.67552 0.68958 0.6975 0.71904 0.71329
TSr (DM) 2.8 1.1 0.4 0.7 0.7 0.8 1.4 0.9
143NdWiNd 0.512544f28 0511744k22 0.511639f27 0.Sl20Zdfl7 0.511%7&24 0.511811f23 0.512COSf18 0511962f30
147Sml144Nd 0.1679 0.1172 0.1146 0.1257 0.1202 0.1222 0.1214 0.1210
L?Nd(0 1.5 -8.8 -10.6 -4.4 -55 -8.5 -5.1 -6.4
TNd (DM) 1.8 21 2.2 1.8 1.9 2.1 1.8 1.8
SNIKNEJ ( 1990) derrefni a elpitlum ecneuqes of -tfir dna ecnanevorp noiger ni order ot wolla gnidnelb of gnireffid
sesahp-gas-lamreht for the edialedA dloF .tleB sihT si ton ecruos .sutirted ,yltnatropmI siht tluser stseggus that -ides
delaever yb the tneserp data ylbissop( eud ot the egral -mas yratnem packages nac eb etiuq mrofinu gnola ekirts so that
gnilp ,)slavretni hcihw si deterpretni ni smret of eno rojam the snoitairav debircsed ni siht paper are ylekil ot tneserper
elcyc .giF( Sa). ehT tseilrae ,stnemides the annallaC ,puorG eurt cihpargitarts segnahc rather naht ekirts-gnola snoitairav
are ylekil ot evah neeb detisoped ni ,detcirtser ylrae -arcartni ni ecnanevorp snoitubirtnoc deunitnoC noitavacxe of the
cinot stfir gnirud the esahp-tfir of noitatnemides dna therefore ecnanevorp noiger neht sesuac the dnert of laudarg decrease
rieht CNd erutangis stcelfer the lacol tnemesab lairetam won ni cNd dna esaercni ni ledom age, ylbamuserp as ylevissergorp
exposed no the relwaG notarC dna sreilni ni the dlof .tleb redlo dna erom devlove tnemesab slairetam are eroded. nI
ehT gniniamer naedialedA stnemides are yllaera evisnetxe ,noitidda cihpargitarts ,nrutrevo yberehw annallaC puorG
dna gnoleb ot the esahp-gas-lamreht of noitatnemides .giF( lairetam was thguorb ot the ecafrus ni sripaid dna denibmocer
8a). riehT rehgih CNd setacidni that tnemegralne of the ecruos ni the retal anatarebmU dna anepliW puorG stnemides (N.
area dewolla gnilpmas of yllacipotosi erom evitimirp ecruos ,nomeL pers. ).nummoc dluow etubirtnoc ot the gnirewol of
.slairetam A erom evisnetxe ecnanevorp noiger for these -gas tNd dna esaercni ni ledom age ni these retal tnemides -gis
phase stnemides si osla detroppus yb the eNd ytienegomoh .serutan
of the ruof ooreynuB .selpmas sihT si etiuq elbakramer -noc sA .giF 7 shows, the esahp-gas stnemides do ton evah 6Nd
gniredis the laretal ecnatsid revo hcihw the selpmas were nekat serutangis ekil the relwaG notarC tnemesab .lairetam sihT
( - 1000 )mk dna setacidni a yrev egral dna etiuq latsid si gniugirtni dna lareves seitilibissop .esira esehT stnemides