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A cryptic Gondwana-forming orogen located in Antarctica

Citation

Daczko, NR and Halpin, JA and Fitzsimons, ICW and Whittaker, JM, A cryptic Gondwana-forming orogen located in Antarctica, Scientific Reports, 8 Article 8371. ISSN 2045-2322 (2018) [Refereed Article]


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Copyright Statement

The Author(s) 2018. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/s41598-018-26530-1

Abstract

The most poorly exposed and least understood Gondwana-forming orogen lies largely hidden beneath ice in East Antarctica. Called the Kuunga orogen, its interpolation between scattered outcrops is speculative with differing and often contradictory trends proposed, and no consensus on the location of any sutures. While some discount a suture altogether, paleomagnetic data from Indo-Antarctica and Australo-Antarctica do require 30005000 km relative displacement during Ediacaran-Cambrian Gondwana amalgamation, suggesting that the Kuunga orogen sutured provinces of broadly Indian versus Australian affinity. Here we use compiled data from detrital zircons offshore of East Antarctica that fingerprint two coastal subglacial basement provinces between 60 and 130E, one of Indian affinity with dominant ca. 980900 Ma ages (Indo-Antarctica) and one of Australian affinity with dominant ca. 11901140 and ca. 1560 Ma ages (Australo-Antarctica). We combine this offshore compilation with existing and new onshore U-Pb geochronology and previous geophysical interpretations to delimit the Indo-Australo-Antarctic boundary at a prominent geophysical lineament which intersects the coast east of Mirny at ~94E.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, plate reconstruction, Gondwana
Research Division:Earth Sciences
Research Group:Geology
Research Field:Tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Halpin, JA (Dr Jacqueline Halpin)
Author:Whittaker, JM (Dr Jo Whittaker)
ID Code:126730
Year Published:2018
Deposited By:Oceans and Cryosphere
Deposited On:2018-06-21
Last Modified:2018-10-18
Downloads:7 View Download Statistics

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