SHRIMP U-Pb zircon geochronology of granites from Sansom Island, Prydz Bay, East Antarctica

Yingchun, Cui and Xiaochun, Liu and Chenguang, Liu and Jianhui, Liu (2018) SHRIMP U-Pb zircon geochronology of granites from Sansom Island, Prydz Bay, East Antarctica. Advances in Polar Science, 29 (2). pp. 135-143.

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Abstract

Sansom Island consists of two low nunataks in Sandefjord Bay, a marginal gulf of Prydz Bay, East Antarctica. These nunataks are composed of two kinds of undeformed biotite granites, and these granites have been dated by ion-microprobe U-Pb zircon geochronology. The zircons from these two samples yield SHRIMP zircon U-Pb concordant ages of 516±5 Ma and 495.8±4.2 Ma, respectively. The results indicate that these granites were emplaced in two pulses in the Cambrian, and further demonstrates the Pan-African event that has overprinted this area. The age of ca. 516 Ma suggests that the undeformed Sansom Island Granite had a different geological history from the Landing Bluff Granite, which contains deformed granite xenoliths dated at ca. 503 Ma, and probably indicates regional variations in the age and intensity of deformation.

Item Type:	Article
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Keywords:	Granite, Sansom Island, SHRIMP U-Pb zircon geochronology, East Antarctica
Subjects:	Natural Environment > Terrestrial
Organizations:	Advances in Polar Science (APS)
Date Deposited:	08 Nov 2023 11:22
URI:	https://library.arcticportal.org/id/eprint/2659

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