Table Of ContentBASEMENT TECTONICS 13
Proceedings of the International Conferences on Basement Tectonics
VOLUME 7
The titles published in this series are listed at the end oft his volume.
BASEMENT TECTONICS 13
Proceedings of the
Thirteenth International Conference on Basement Tectonics,
held in Blacksburg, Virginia, U .S.A., June 1997
Edited by
A. KRISHNA SINHA
Virginia Polytechnic Institute arul State Vniversity,
Blacksburg, Virginia, V.SA.
SPRINGER SCIENCE+BUSINESS MEDIA, B.V.
A C.I.P. Catalogue record for this book is available from the Library of Congress.
ISBN 978-94-010-6015-8 ISBN 978-94-011-4800-9 (eBook)
DOI 10.1007/978-94-011-4800-9
Cover: Schematic cross section of the Grenville basement in the Blue Ridge of Virginia
(from Sinha and Bartholomew, 1984 in The Grenville Event in the
Appalachians, Geological Society of America Special Paper 194)
Printed on acid-free paper
AlI Rights Reserved
© 1999 Springer Science+Business Media Dordrecht
Originally published by Kluwer Academic Publishers in 1999
Softcover reprint ofthe hardcover Ist edition 1999
No part of the material protected by this copyright notice may be reproduced or
utilized in any form or by any means, electronic or mechanical,
including photocopying, recording or by any information storage and
retrieval system, without written permission from the copyright owner.
CONTENTS
Trustees ......................................................................................................... vii
Foreword ......................................................................................................... ix
Selected Proceedings Papers
Geotectonics and Characteristic Features of Fertile and Non-Fertile Younger Granites,
Eastern Desert, Egypt
F.S. Bakhit, H.A. Hussein, M.M. Ali. .................................................................. 1
Structural Associations of the Basement and Sedimentary Cover of the Georgian Part of
the Caucasus
L.Basheleishvili. ................................................... ........................................... 25
The Eastern Edge of the Rio de la Plata Craton: A History of Tangential Collisions
N. Campal, A.Schipilov. ...................................................... ............................. 33
New Data and Interpretations for the Precambrian, Midcontinent USA
M.P. Car/son, S.B.Treves, R.J. Goble, A. Xu ...................................................... .49
Allochthonous Units in the Variscan Belt of NW Iberia: Terranes and Accretionary
History
l.R.Martinez Catalan, R.Arenas, F.Diaz Garcia, l.Abati. ......................................... 65
Early Compression and Late Dextral Transpression Within the Grenvillian Event of the
Hudson Highlands, NY, USA
A.E. Gates .... ................................................................................................... 85
Crust-Forming Processes: Basement and Basements in the Southern Appalachian Orogen
R.D. Hatcher. .................................................................................................. 99
Petrogenesis of Pan-African Granitoids, Gabal Hamra Area, Southwestern Sinai, Egypt
H.A.Hussien, A.G.El Shazly, I.E. El Assy, M.M. El Galy .................................... 119
Geology of the Blue River Gneiss, Eastern Arbuckle Mountains, Oklahoma
E.G. Lidiak, R.E. Denison ............................................................................... 139
vi
Zircon Ages of Basement Orthogneisses from the Northern Segment of the Araguaia Belt,
Brazil
C.A. V.Moura, H.E.Gaudette ............................................................................ 155
Damodar Graben - A Centre of Contrasting Magmatism in the Eastern Indian Shield
Margin
D.Mukherjee, N.C.Ghose ................................................................................ 179
A New Tectonic Belt in the Baltic Sea Region - Farther Interpretation of the Deep
Seismic Results from the "Baltic Sea" and "Babel-B" Profiles
A.A. Ostrovsky ............................................................................................. 203
A Geochemical Reconnaissance of the Roseland Anorthosite Complex, Virginia, and
Comparisons with Andesine Anorthosites from the Grenville Province, Quebec
B.E.Owens, R.F.Dymek. ................................................................................. 217
Basement Tectonic Structures Delineated from Aeromagnetic Survey Data South Eastern
Desert, Egypt
S.I. Rabie, A.F. Khalil.. ................................................................................. 233
Appalachians in the Time Interval Between the Grenville Orogeny and Variscan Collision
N.Rast, J. W.Skehan ....................................................................................... 257
Geodynamics of the Early Precambrian: Evidence for the Baltic Shield
E. V.Sharkov ................................................................................................. 277
Lead Isotope Mapping of Crustal Reservoirs Within the Grenville Superterrane: II.
Adirondack Massif, New York
A.K.Sinha, J.M.McLelland .............................................................................. 297
Paleomagnetism of the Boot-Phantom Pluton and the Amalgamation of the Juvenile
Domains in the Paleoproterozoic Trans-Hudson Orogen, Canada
D. T.A.Symons, C.D.MacKay .......................................................................... 313
Dengying Formation Gas System of the Sichuan Basin, Southwest China: Model for
Precambrian Indigenous Hydrocarbon Accumulation
G.Zhang, A.B.Dickas, J.Song ...... .................................................................... 333
Morpholog~ and Isotopic Age of Zircons from Shear-Zones Within Granitoids of the
Belomorian Tectonic Zone, Baltic Shield, Russia
T.F.Zinger, V.S.Baikova, B. V.Belyatsky, S. V. Klepinin, J.Gotze, O.A.Levchenkov,
I. K. Shuleshko .... ........................................................................................... 3 4 5
TRUSTEES
International Basement Tectonics Association, Inc.
Chief Trustee
Chairman of the Board of Trustees
M.Charles Gilbert
School of Geology and Geophysics
University of Oklahoma
Norman, OK 73019 USA
Trustee
Treasurer
Stephen Marshak
Department of Geology
University of Illinois
Urbana, IL 61801 USA
Trustee
Secretary
A. Krishna Sinha
Department of Geological Sciences
Virginia Polytechnic Institute and State University
Blacksburg, VA 24061 USA
Trustee
Marvin Carlson
Nebraska Geological Survey
University of Nebraska
Lincoln, NE 58588 USA
Past Chief Trustee
MJ. Bartholomew
Earth Sciences and Resources Institute
University of South Carolina
Columbia, SC 29208 USA
vii
FOREWORD
The Thirteenth International Conference on Basement Tectonics was held on the campus
of Virginia Polytechnic Institute and State University in Blacksburg, Virginia from June
2 - 6, 1997. The oral presentations and discussions over three days covered a wide range
of topics, and provided the international audience with a perspective on scientific efforts
underway around the world. The conference participants were able to attend two separate
field trips: (I) a pre-conference trip guided by Professor Robert Hatcher of the University
of Tennessee, Knoxville, examined the Basement rocks in the North Carolina - Tennessee
region of the Appalachian Mountains, and (2) a mid-conference field trip guided by A.K.
Sinha, convener of the conference, allowed participants to examine the complex rock
associations and structures of the> 1000 m.y. old basement rocks in Virginia. Both the
field trip guidebooks and abstract volumes were published for the conference.
The meeting brought together scientists from more than 14 countries. Their
participation, and the fiscal success of the meeting would not have been possible without
the support of the Department of Geological Sciences, the College of Arts and Sciences
(VPI&SU) and the Basement Tectonics Association. Their support is gratefully
acknowledged.
As Chairman of the Organizing Committee, I would like to thank Margie Sentelle, Jay
Thomas, Peter Welch, and Barry Robinson for the smooth operation of the conference.
Jyl Smithson - Riehl, Assistant Director of Program Development at VPI&SU provided
the support necessary to host an International meeting in a university setting. Kim
Bevan's ability to assemble and edit the manuscripts that constitute this volume is
gratefully acknowledged. On behalf of the participants, I also thank the Trustees of the
International Basement Tectonics Association, Inc. for their permission to hold the
conference in Blacksburg. Finally, a thank you to all the participants who have provided
the manuscripts for this volume.
A. Krishna Sinha, Convener
Professor of Geology
Virginia Polytechnic Institute and State University
Blacksburg, VA 24061
ix
GEOTECTONICS AND CHARACTERISTIC FEATURES OF FERTILE AND
NON-FERTILE YOUNGER GRANITES, EASTERN DESERT, EGYPT
F.S. Bakhit, H.A. Hussein and M.M. Ali
Nuclear Materials Authority, Cairo, Egypt.
P.O. Box: 530 EI-Maadi - Cairo
Abstract: The present article is concerned with the geochemistry of red-pink granites
in the Late Orogenic Plutonites and their relationship with uranium content in order to
discriminate the fertile from non-fertile types. Chemical analysis has been carried out,
including the major oxides, trace elements and REE, to detennine their geotectonic
affinity, and the relationship between U and major oxides, trace elements and rare
earth elements.
Geotectonically, the study revealed that the post orogenic red-pink granites are
either within-plate granites or volcanic arc granites. Chemically, the granites are
subalkaline and peraluminous to metaluminous. Also, the younger granites occur in
three phases. The highly differentiated phase is the fertile type which is characterized
by high silica content, with respect to alumina, impoverished in calcium, as well as in
ferromagnesian elements (Fe203+MgO) and is enriched in alkali elements
(Na20+K20). Moreover, the fertile type ;s characterized by high Rb and low Sr. Also,
direct relation between Si02 and Rb is obtained, while with Ba and Sr do not correlated
well. The REE illustrate that the fertile granites possess high negative Eu value relative
to the normal type.
The relationship between U and La, Ce, Sm, Pb, Rb, Zr, F and Mo was found to be
direct relation, while Co, Sr, Eu, and Ba was found to be a weak correlation ..
1. Introduction
The study area including six younger granitic plutons namely; Gabal Hadrabiya,
Gabal EI Dob, Gabal El Urf, Gabal El Erediya, Gabal EI Missikat aild Gabal Kab
Amiri. They lie within the limits oflatitudes 26 18' and 26 43' N and longitudes
33 IS' and 33 40' E in the Central Eastern Desert of Egypt. These six granite
plutons lie just at the north and south the midway of Qena-Safaga road (Fig. I ).
Aerial radiometric and magnetic surveys were carried out for an area covering
about 4500 km" including the six mentioned granitic plutons in the studied area
(Fig.2). The aerial survey indicated the presence of significant radioactive anomalies
scattered in the area (Ammar, 1973). The subsequent field "'ork for ground checking
and follo,\ing these airborne anomalies was carried out and some highly radioactiyc
occurrences with visible uranium mineralization were discovered ( EI-Kassas, 1974 ;
Bakhit, 1978).
A. K. Sinha (ed.), Basement Tectonics 13, 1-24.
@ 1999 Kluwer Academic Publishers.
N
LEG END
ROCK TYPES
D FORELAND SEDIMENTS
r::zJ NUBIAN SANDSTONES
~ BASIC DYKES
0APLITE DYKES
~ LATE OROGENIC GRANITES
rrII SYNOROGENIC
L.I..J PLUTONITES
~ ... AIN GEOSYNCLINAL
L....A..J VOLCANICS
F.:'":l GEOSYNCLINAL
~ SEDIMENTS
STRUCTURES
/ GEOLOGICAL CONTACT
CASHen WHEN INf£RRED
/ FAIUNLFTE RDRAESDH ED WHEN
• TRIANGULATION
POINTS
~ OLD MINES
Uo URANIUM
o 2 4 Km
~
!'Tl
!=Il
t:tJ
~
Figure 1. Geological and structural map of the studied granite plutons, Eastern Desert, Egypt. ~
(after El-Kassas and Bakhit, 1989).
~
