Publication:
Unravelling the complex sub-ice geology of the Wilkes Subglacial Basin region of East Antarctica from marine sediment provenance analyses

Simple item page
dc.contributor.authorPandey, Mayuri
dc.contributor.authorPant, Naresh Chandra
dc.contributor.authorArora, Devsamridhi
dc.contributor.authorFerraccioli, Fausto
dc.contributor.authorGupta, Rashmi
dc.contributor.authorJoshi, Sonalika
dc.date.accessioned2025-01-28T09:42:54Z
dc.date.available2025-01-28T09:42:54Z
dc.date.issued2023
dc.description.abstractDeciphering the sub-ice geology in the Wilkes Subglacial Basin region is important for understanding solid earth-ice sheet evolution and for assessing geological ties between East Antarctica and formerly contiguous Australia. We analyse marine sediment samples derived from drill site U1359 of Integrated Oceanic Drilling Program Expedition 318. Our study reports for the first time that the inland sediment source area comprises a complex mafic igneous terrain and a metamorphosed Precambrian subglacial basement. Pyroxene geochemical analyses confirm the presence of tholeiitic to calc-alkaline basalts. The high-grade part of the subglacial terrain contains upper amphibolite to granulite facies rocks that are comparable to Archaean to Palaeoproterozoic rocks exposed in the Terre Ad�lie Craton and the formerly adjacent Gawler Craton in Australia. Chemical Th-U-total Pb isochron method (CHIME) ages extracted from a subhedral monazite grain associated with the low-grade biotite-muscovite schist rock fragment provide a unimodal age of 799 � 13 Ma. Rare occurrences of 800 Ma age in the Terre Ad�lie Craton and/or George V Coast provide evidence for the presence of at least one late Neoproterozoic magmato-metamorphic event in the interior of Wilkes Land. The affinity of the unexposed geological domains of Wilkes Land, East Antarctica, with their Australian counterparts is discussed in the context of the Rodinia supercontinent. Copyright � The Author(s), 2023. Published by Cambridge University Press on behalf of Antarctic Science Ltd.
dc.identifier.doihttps://doi.org/10.1017/S0954102023000123
dc.identifier.issn9541020
dc.identifier.urihttps://dl.bhu.ac.in/ir/handle/123456789/22130
dc.language.isoen
dc.publisherCambridge University Press
dc.subjectAustralo-Antarctica
dc.subjectheavy minerals
dc.subjectTonian-Cryogenian
dc.subjectWilkes Subglacial Basin
dc.titleUnravelling the complex sub-ice geology of the Wilkes Subglacial Basin region of East Antarctica from marine sediment provenance analyses
dc.typeArticle
dspace.entity.typePublication
journal.titleAntarctic Science
journalvolume.identifier.volume35

Files

Collections

2023