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Gondwana Six: Structure, Tectonics, and Geophysics

Gondwana Six: Structure, Tectonics, and Geophysics

Garry D. McKenzie (Editor)

ISBN: 978-1-118-66448-3

Mar 2013, American Geophysical Union

323 pages

Select type: O-Book

Description

Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 40.

This volume contains many of the papers presented at the Sixth International Gondwana Symposium, held at the Institute of Polar Studies, The Ohio State University, Columbus, Ohio, August 19-23, 1985. The symposium was the first held outside the Gondwanaland continents; other symposia were held in Buenos Aires, Argentina, 1967; Cape Town and Johannesburg, South Africa, 1970; Canberra, Australia, 1973; Calcutta, India, 1977; and Wellington, New Zealand, 1980.

The Columbus symposium attracted 150 scientist from 19 countries to five days of technical sessions, six field trips, commission and working group meetings, and workshops. Topics covered in the technical sessions were generally similar to those of earlier meetings and included reconstruction of Gondwanaland, vertebrate and invertebrate paleontology, biogeography, glacial geology, Gondwana stratigraphy, economic geology, and tectonics and sedimentation at plate margins. A notable difference was in geographic coverage. As might be expected at a meeting co-hosted by the Institute of Polar Studies and the Department of Geology and Minerology at The Ohio State University, the focus of the meeting was on Antarctica, with 45% of the 102 papers covering the Ross Sea sector, West Antarctica, and northern Victoria Land.

Dedication vii

Preface xi

Acknowledgments xii

Seismic Refraction Measurements of Crustal Structure in West Antarctica
Sean T. Rooney, Donald D. Blankenship, and Charles R. Bentley 1

Satellite Magnetic Anomalies and Continental Reconstructions
R. R. B. von Frese, W. J . Hinze, R. Olivier, and C. R. Bentley 9

A Revised Reconstruction of Gondwanaland
Lawrence A. Lawver and Christopher R. Scotese 17

The Handler Formation, a New Unit of the Robertson Bay Group, Northern Victoria Land, Antarctica
Thomas O. Wright and Colin Brodie 25

Radiometric Ages of Pre-Mesozoic Rocks From Northern Victoria Land, Antarctica
H. Kreuzer, A. Hohndorf, H. Lenz, P. Midler, and U. Vetter 31

A Review of the Problems Important for Interpretation of the Cambro-Ordovician
Paleogeography of Northern Victoria Land (Antarctica), Tasmania, and New Zealand
R. H. Findlay 49

Paleozoic Magmatism and Associated Tectonic Problems of Northern Victoria Land, Antarctica
S. G. Borg and E. Stump 67

Construction of the Pacific Margin of Gondwana During the Pannotios Cycle
Edmund Stump 11

Early Paleozoic Westward Directed Subduction at the Pacific Margin of Antarctica
G. Kleinschmidt and F. Tessensohn 89

Joint U.K.-U.S. West Antarctic Tectonics Project: An Introduction
Ian W. D. Dalziel and Robert J . Pankhurst 107

Crustal Structure of the Area Around Haag Nunataks, West Antarctica: New Aeromagnetic
and Bedrock Elevation Data
S. W. Garrett, L. D. B. Herrod, and D. R. Mantripp 109

Outline of the Structural and Tectonic History of the Ellsworth Mountains-Thiel Mountains
Ridge, West Antarctica
B. C. Storey and I. W. D. Dalziel 117

Correlation of Gabbroic and Diabasic Rocks From the Ellsworth Mountains, Hart Hills, and
Thiel Mountains, West Antarctica
Walter R. Vennum and Bryan C. Storey 129

Petrology, Geochemistry, and Tectonic Setting of Granitic Rocks From the Ellsworth-Whitmore Mountains Crustal Block and Thiel Mountains, West Antarctica
Walter R. Vennum and Bryan C. Storey 139

Rb-Sr Geochronology of the Region Between the Antarctic Peninsula and the Transantarctic
Mountains: Haag Nunataks and Mesozoic Granitoids
I. L. Millar and R. J . Pankhurst 151

Ellsworth-Whitmore Mountains Crustal Block, Western Antarctica: New Paleomagnetic
Results and Their Tectonic Significance
A. M. Grunow, I. W. D. Dalziel, and D. V. Kent 161

The Ellsworth-Whitmore Mountains Crustal Block: Its Role in the Tectonic Evolution of West
Antarctica
I. W. D. Dalziel, S. W. Garrett, A. M. Grunow, R. J . Pankhurst, B. C. Storey, and W. R. Vennum 173

Sedimentary Rocks of the English Coast, Eastern Ellsworth Land, Antarctica
T. S. Laudon, D. J . Lidke, T. Delevoryas, and C. T. Gee 183

The Gondwanian Orogeny Within the Antarctic Peninsula: A Discussion
B. C. Storey, M. R. A. Thomson, and A. W. Meneilly 191

Sandstone Detrital Modes and Basinal Setting of the Trinity Peninsula Group, Northern
Graham Land, Antarctic Peninsula: A Preliminary Survey
L. Smellie 199

Structural Evolution of the Magmatic Arc in Northern Palmer Land, Antarctic Peninsula
A. W. Meneilly, S. M. Harrison, B. A. Piercy, and B. C. Storey 209

Late Paleozoic Accretionary Complexes on the Gondwana Margin of Southern Chile: Evidence
From the Chonos Archipelago
John Davidson, Constantino Mpodozis, Estanislao Godoy, Francisco Herve, Robert Pankhurst, and Maureen Brook 221

Early Paleozoic Structural Development in the NW Argentine Basement of the Andes and Its
Implication for Geodynamic Reconstructions
A. P. Willner, U. S. Lottner, and H. Miller 229

Paleomagnetism of Permian and Triassic Rocks, Central Chilean Andes
Randall D. Forsythe, Dennis V. Kent, Constantino Mpodozis, and John Davidson 241

Late Paleozoic Pseudoalbaillellid Radiolarians From Southernmost Chile and Their Geological
Significance
Hsin Yi Ling and Randall D. Forsythe 253

The Late Paleozoic Evolution of the Gondwanaland Continental Margin in Northern
Chile
C. M. Bell 261

Permian to Late Cenozoic Evolution of Northern Patagonia: Main Tectonic Events, Magmatic Activity, and Depositional Trends
M. A. Uliana and K. T. Biddle 271

Petrology and Facies Analysis of Turbiditic Sedimentary Rocks of the Puncoviscana Trough
(Upper Precambrian-Lower Cambrian) in the Basement of the NW Argentine
Andes P. Jezek and H. Miller 287

Aspects of the Structural Evolution and Magmatism in Western New Schwabenland, Antarctica
G. Spaeth 295

Plate Tectonic Development of Late Proterozoic Paired Metamorphic Complexes in Eastern
Queen Maud Land, East Antarctica
Kazuyuki Shiraishi, Yoshikuni Hiroi, Yoichi Motoyoshi, and Keizo Yanai 309

Tectonic Position of Karoo Basalts, Western Zambia
Raphael Unrug 319

Symposium Participants 323