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

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 yie...

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Bibliographic Details
Main Authors: Yingchun, Cui, Xiaochun, Liu, Chenguang, Liu, Jianhui, Liu
Format: Article in Journal/Newspaper
Language:English
Published: Polar Research Institute of China - PRIC 2018
Subjects:
Terrestrial
East Antarctica
Prydz Bay
The Landing
Sandefjord
Sansom Island
Landing Bluff
Sandefjord Bay
Advances in Polar Science
Antarc*
Antarctica
Polar Science
Online Access:http://library.arcticportal.org/2659/
http://library.arcticportal.org/2659/1/A1802006.pdf
Description
Summary: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.

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