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Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy

Hunter, Morag A.; Cantrill, David J.; Flowerdew, Michael J.; Millar, Ian L.. 2005 Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy. Journal of the Geological Society, 162 (5). 745-748. 10.1144/0016-764905-051

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Abstract/Summary

New U–Pb zircon ion-microprobe ages from the alluvial conglomerates and flood plain sediments of the Botany Bay Group demonstrate that sedimentation occurred at c. 167 Ma, coeval with rift-related silicic volcanism in the northern Antarctic Peninsula. In contrast, rift-related volcanism and sedimentation in the southern Antarctic Peninsula (Latady Basin) occurred at c. 183 Ma. The new data indicate that syn-rift sedimentation and volcanism was diachronous from south to north, consistent with early opening of the Weddell Sea embayment by anti-clockwise rotation of the Antarctic Peninsula in the Mid-Jurassic. A definitive date for the Botany Bay Group floras has important implications for Southern Hemisphere biostratigraphic correlations.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1144/0016-764905-051
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Antarctica in the Dynamic Global Plate System
ISSN: 0016-7649
Additional Keywords: Biostratigraphy, Gondwana, Absolute age
NORA Subject Terms: Earth Sciences
Date made live: 21 Dec 2007 14:30
URI: http://nora.nerc.ac.uk/id/eprint/1818

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