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Proterozoic geological evolution of the northern Vestfold Hills, Antarctica

Published online by Cambridge University Press:  01 May 2009

C. W. Passchier ,
R. F. Bekendam ,
J. D. Hoek ,
P. G. H. M. Dirks  and
H. de Boorder
C. W. Passchier
Affiliation:
Institute of Earth Sciences, Budapestlaan 4, Utrecht, The Netherlands
R. F. Bekendam
Affiliation:
Institute of Earth Sciences, Budapestlaan 4, Utrecht, The Netherlands
J. D. Hoek
Affiliation:
Institute of Earth Sciences, Budapestlaan 4, Utrecht, The Netherlands
P. G. H. M. Dirks
Affiliation:
Department of Geology, University of Melbourne, Parkville, Victoria 3052, Australia
H. de Boorder
Affiliation:
Institute of Earth Sciences, Budapestlaan 4, Utrecht, The Netherlands
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Abstract

The presence of polyphase shear zones transected by several suites of dolerite dykes in Archaean basement of the Vestfold Hills, East Antarctica, allows a detailed reconstruction of the local structural evolution. Archaean and early Proterozoic deformation at granulite facies conditions was followed by two phases of dolerite intrusion and mylonite generation in strike-slip zones at amphibolite facies conditions. A subsequent middle Proterozoic phase of brittle normal faulting led to the development of pseudotachylite, predating intrusion of the major swarm of dolerite dykes around 1250 Ma. During the later stages and following this event, pseudotachylite veins were reactivated as ductile, mylonitic thrusts under prograde conditions, culminating in amphibolite facies metamorphism around 1000–1100 Ma. This is possibly part of a large-scale tectonic event during which the Vestfold block was overthrust from the south. In a final phase of strike-slip deformation, several pulses of pseudotachylite-generating brittle faulting alternated with ductile reactivation of pseudotachylite.

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Articles
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Geological Magazine , Volume 128 , Issue 4 , July 1991 , pp. 307 - 318
Copyright
Copyright © Cambridge University Press 1991

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