Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy
Morag A. Hunter
David J. Cantrill
Michael J. Flowerdew
Ian L. Millar
10.6084/m9.figshare.3454298.v1
https://geolsoc.figshare.com/articles/dataset/Mid-Jurassic_age_for_the_Botany_Bay_Group_implications_for_Weddell_Sea_Basin_creation_and_southern_hemisphere_biostratigraphy/3454298
<p>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 <strong><em>c.</em></strong> 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 <strong><em>c.</em></strong> 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.
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2016-06-21 12:02:00
Weddell Sea embayment
Weddell Sea Basin creation
Southern Hemisphere biostratigraphic correlations
Ma
sedimentation
Antarctic Peninsula
Botany Bay Group floras
Botany Bay Group
volcanism
implication
Geology