Palinspastic (pre-rift and -drift) fit of India and conjugate Antarctica and geological connections across the suture

The passive continental margins of India and conjugate Antarctica (30 degrees-80 degrees E) have been reconstructed quantitatively by eliminating the intervening ocean floor. Recently acquired seismic and gravity data from the margins define the boundary between continental and oceanic crust (COB) a...

Full description

Bibliographic Details
Published in:Gondwana Research
Main Author: Veevers, J. J.
Format: Article in Journal/Newspaper
Language:English
Published: 2009
Subjects:
Palinspastic fit
Antarctica
India
Gondwanaland
Eastern Ghats-Rayner Complex
Lambert-Mahanadi Rift
EASTERN GHATS BELT
PRINCE-CHARLES MOUNTAINS
U-PB GEOCHRONOLOGY
KEMP-LAND COAST
CONTINENTAL-MARGIN
NAPIER COMPLEX
SRI-LANKA
CRUSTAL STRUCTURE
PENINSULAR INDIA
THERMAL HISTORY
Antarctic
Indian
Kemp Land
MacRobertson Land
Napier
Prince Charles Mountains
Rayner
The Antarctic
Vestfold
Vestfold Hills
Antarc*
Online Access:https://researchers.mq.edu.au/en/publications/88ef1be8-5c86-4c95-be9e-4681ec4c1d6e
https://doi.org/10.1016/j.gr.2009.02.007
Description
Summary:The passive continental margins of India and conjugate Antarctica (30 degrees-80 degrees E) have been reconstructed quantitatively by eliminating the intervening ocean floor. Recently acquired seismic and gravity data from the margins define the boundary between continental and oceanic crust (COB) and indicate the thickness of the extended (rifted) continental crust. The COBs are restored to their pre-rift position by eliminating pre-drift extension and are fitted together. This fully palinspastic reconstruction reveals the Lambert and Mahanadi Rifts aligned in a Permian-Triassic rift system, the Napier salient draped by the bight of India, and strong connections within each of four sectors: (1) Southern Granulite Terrain-Sri Lanka-Lutzow-Holm Terrane-Rayner Complex; (2) Napier-southern Eastern Ghats Mobile Belt-Dharwar Craton: (3) Kemp Land-MacRobertson Land-northern Eastern Ghats Mobile Belt-Bastar Craton: and (4) Prydz-Rauer-Vestfold Hills-Singhbhum Province. Major events registered are (a) a 0.9-1.3 Ga (Grenville) convergence that formed the Eastern Ghats-Rayner Mobile Belt in Rodinia, and (b) 0.50-0.60 Ga (Pan-Gondwanaland) events that accreted the Southern Granulite Terrain and Sri Lanka to the Antarctic-Indian region. Gondwanaland broke up at 0.14 Ga along the grain of the Eastern Ghats-Rayner Mobile Belt and across the composite Archean Dharwar-Napier Craton and the long axis of the Permian-Triassic rift system. (C) 2009 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Similar Items