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

极地研究 ›› 1997, Vol. 8 ›› Issue (2-English): 89-95.

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

Zheng Xiangshen¹, Hu Shiling¹, Liu Jiaqi¹ and Francesc Sàbat²

¹Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China ²Universitat de Barcelona, Facultat de Geologia, 08028 Barcelona, Spain

出版日期:1947-06-30 发布日期:1947-06-30
通讯作者: Zheng Xiangshen
基金资助:
This project is supported by National Natural Science Foundation of China (No. 49673176) and the National Science & Technology Committee of China (85-03-04) and Chinese Academy of Sciences (KJ85-08-03).

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

Zheng Xiangshen¹, Hu Shiling¹, Liu Jiaqi¹ and Francesc Sàbat²

¹Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China ²Universitat de Barcelona, Facultat de Geologia, 08028 Barcelona, Spain

Online:1947-06-30 Published:1947-06-30
Contact: Zheng Xiangshen
Supported by:
This project is supported by National Natural Science Foundation of China (No. 49673176) and the National Science & Technology Committee of China (85-03-04) and Chinese Academy of Sciences (KJ85-08-03).

摘要/Abstract

摘要：

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.

关键词: Mount Bowles Formation, ⁴⁰Ar/³⁹Ar age dating, Livingston Island, Antarctica

Abstract:

Key words: Mount Bowles Formation, ⁴⁰Ar/³⁹Ar age dating, Livingston Island, Antarctica

Zheng Xiangshen, Hu Shiling, Liu Jiaqi, Francesc Sabat. New ⁴⁰Ar/³⁹Ar age evidence for the Cretaceous volcanic rocks of the Mount Bowles Formation in Livingston Island, South Shetland Islands[J]. 极地研究, 1997, 8(2-English): 89-95.

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

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

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