New 40Ar/39Ar age evidence for the Cretaceous volcanic rocks of the Mount Bowles Formation in Livingston Island, South Shetland Islands

Xiangshen, Zheng and Shiling, Hu and Jiaqi, Liu and Sábat, Francesc (1997) New 40Ar/39Ar age evidence for the Cretaceous volcanic rocks of the Mount Bowles Formation in Livingston Island, South Shetland Islands. Advances in Polar Science, 8 (2). pp. 89-95.

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Abstract

The age of the volcanic rocks of the Mount Bowles Formation (MBF) on the eastern part of Livingston Island, South Shetland Islands, Antarctica is redetermined by using 40Ar/39Ar and laser microarea isochron age dating method with a continuous laser system and mass spectrometer. The isochron ages of an andesite sample and a basaltic andesite sample are (105.62 ± 2.11) Ma and (111.48 ± 2.23) Ma with the 40Ar/39Ar initial ratios of 295.3 and 294.6 respectively, being almost the same as the atmospheric value, which proves that there exists no excess argon in these rocks. The 40Ar/39Ar plateau age of an aplite sample is (96.7 ± 1.6) Ma and the calculated isochron age is 96.6 Ma, which indicates that the aplite occurred after lava eruption. These data suggest that the MBF volcanic rocks were formed during Cretaceous.

Item Type:	Article
Related URLs:
Keywords:	Mount Bowles Formation, 40Ar/39Ar age dating, Livingston Island, Antarctica.
Subjects:	Unspecified
Organizations:	Unspecified
Date Deposited:	21 Apr 2023 13:13
URI:	http://library.arcticportal.org/id/eprint/2134

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