LA-ICP-MS zircon U-Pb age of the volcanic rocks in Chubb area, Xietongmen County, Tibet, and its geological implications

ZHANG Peng; YAO Sheng; LI Yonglong; WEI Ming; TENG Fei

2019 Vol. 38, No. 5

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Article navigation > Geological Bulletin of China > 2019 > 38(5): 767-776

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ZHANG Peng, YAO Sheng, LI Yonglong, WEI Ming, TENG Fei. LA-ICP-MS zircon U-Pb age of the volcanic rocks in Chubb area, Xietongmen County, Tibet, and its geological implications[J]. Geological Bulletin of China, 2019, 38(5): 767-776.

Citation:

ZHANG Peng, YAO Sheng, LI Yonglong, WEI Ming, TENG Fei. LA-ICP-MS zircon U-Pb age of the volcanic rocks in Chubb area, Xietongmen County, Tibet, and its geological implications[J]. Geological Bulletin of China, 2019, 38(5): 767-776.

LA-ICP-MS zircon U-Pb age of the volcanic rocks in Chubb area, Xietongmen County, Tibet, and its geological implications

1.
Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang 712000, Shaanxi, China
2.
No.2 Geological Party, Tibet Bureau of Geology and Exploration, Lhasa 850000, Tibet, China

Received Date: 01 July 2018

Revised Date: 03 September 2018

Publish Date: 15 May 2019

Abstract

Abstract

The No.2 Geobrigade of Tibet Geological Prospecting Bureau has disintegrated a set of volcanic rocks in the 1:50 thousand regional geological survey of the chubb area of Xietongmen county. It composed dominantly of andesite, rhyolite, volcanic breccia and tuff. The total thickness of the rock strata decreases from east to west in the study area. The U-Pb isotopes of zircons from rhyolite and andesite samples were determined by LA-ICP-MS. The weighted average ages of ²⁰⁶Pb/²³⁸U were 15.12±0.29Ma (MSWD=1.8, n=8), 45.39 ±0.56Ma (MSWD=0.93, n=14) in rhyolite and 15.29 ±0.16Ma (MSWD=1.4, n=59), 51.9 ±2.3Ma (MSWD=3.5, n=7), 45.2±1.4Ma (MSWD=3.8, n=10), 38.5±0.93Ma (MSWD=1.08, n=5) in andesite. Based on this, the eruption time limit of this suite of volcanic rocks is determined to be 15Ma or so, and it belongs to the Bugasi Group.
- Miocene /
- volcanic rocks /
- Gangdese belt /
- LA-ICP-MS zircon U-Pb age

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References

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