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.
![[img]](http://library.arcticportal.org/style/images/fileicons/application_pdf.png) |
PDF
Download (1MB) |
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: | |
| Uncontrolled 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 |
Actions (login required)
 |
View Item |