期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 162, 期 -, 页码 745-748出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/0016-764905-051
关键词
Antarctica; Middle Jurassic; Gondwana; biostratigraphy; absolute age
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.
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