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Refined geological history of the polyphase plutonometamorphic complex in the Thala Hills area (Enderby Land, East Antarctica) from zircon SHRIMP dating and implications for Neoproterozoic amalgamation of Gondwanaland

By
Evgeniy Mikhalsky
Evgeniy Mikhalsky
Gramberg Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia), 1 Angliiskii Prospekt, 190121 St Petersburg, Russia
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Dmitry Krylov
Dmitry Krylov
Institute of Precambrian Geology and Geochronology (IPGG RAS), 2 Makarova Embankment, 199034 St Petersburg, Russia
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Nickolay Rodionov
Nickolay Rodionov
Karpinsky Geological Institute (VSEGEI), 74 Srednii Prospekt, 199106 St Petersburg, Russia
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Sergey Presnyakov
Sergey Presnyakov
Karpinsky Geological Institute (VSEGEI), 74 Srednii Prospekt, 199106 St Petersburg, Russia
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Sergey Skublov
Sergey Skublov
Institute of Precambrian Geology and Geochronology (IPGG RAS), 2 Makarova Embankment, 199034 St Petersburg, RussiaSaint-Petersburg Mining University (SPMU), 2 21st Liniya, 199106 St Petersburg, Russia
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Oleg Myasnikov
Oleg Myasnikov
Belarus Institute for Natural Management, National Academy of Sciences, 10 F. Skoriny Street, 220114 Minsk, Republic of Belarus
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Published:
January 01, 2017

Abstract

The Thala Hills area occupies a key position in Gondwanaland reconstructions near the India–Sri Lanka–Antarctica junction. We present U–Pb zircon isotopic age determinations from SHRIMP II obtained on four granite gneiss samples. Three high-temperature tectonomagmatic episodes may be distinguished in the study area at c. 980–970, c. 780–720 and c. 545–530 Ma. The c. 980–970 Ma event corresponds to the Rayner Structural Episode that affected East Antarctica, including the Sør Rondane Mountains to the west and Kemp Land to the east. The c. 780–720 Ma episode included two events at approximately 780 Ma (high-grade anatexis) and 720 Ma (syntectonic granitoid emplacement), and was roughly coeval with tectonomagmatic events in Dronning Maud Land of East Antarctica, as well as in other Gondwanaland regions, such as Madagascar, Sri Lanka and eastern Africa. The c. 780–720 Ma episode may be correlated with the East African Orogeny. These correlations argue for a similar geological evolution and conjugate position for Dronning Maud Land and Enderby Land despite a postulated Cambrian Lützow–Holm Bay suture separating them. The Cambrian (c. 545–530 Ma) episode was manifested by high-grade anatexis that confirms previously identified late Neoproterozoic–Cambrian tectonothermal activities in the study area.

Supplementary material: Trace element compositions of zircons and whole-rock chemical compositions obtained by previous studies are available at https://doi.org/10.6084/m9.figshare.c.3738332

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Contents

Geological Society, London, Special Publications

Crustal Evolution of India and Antarctica: The Supercontinent Connection

N. C. Pant
N. C. Pant
University of Delhi, India
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S. Dasgupta
S. Dasgupta
Jamia Millia Islamia, India
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The Geological Society of London
Volume
457
ISBN electronic:
9781786203380
Publication date:
January 01, 2017

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