LA-ICP-MS zircon U-Pb age and geochemical characteristics of Jiada potas-sic volcanic rocks in Zhongba terrane, Tibet

YANG Shuo; XIANG Shuyuan; ZHANG Xian; LI Zhixuan; LIU Zhenhe

2016 Vol. 35, No. 6

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YANG Shuo, XIANG Shuyuan, ZHANG Xian, LI Zhixuan, LIU Zhenhe. LA-ICP-MS zircon U-Pb age and geochemical characteristics of Jiada potas-sic volcanic rocks in Zhongba terrane, Tibet[J]. Geological Bulletin of China, 2016, 35(6): 894-905.

Citation:

YANG Shuo, XIANG Shuyuan, ZHANG Xian, LI Zhixuan, LIU Zhenhe. LA-ICP-MS zircon U-Pb age and geochemical characteristics of Jiada potas-sic volcanic rocks in Zhongba terrane, Tibet[J]. Geological Bulletin of China, 2016, 35(6): 894-905.

LA-ICP-MS zircon U-Pb age and geochemical characteristics of Jiada potas-sic volcanic rocks in Zhongba terrane, Tibet

1. College of Earth Science, China University of Geosciences, Wuhan 430074, Hubei, China;
2. Xinjiang Institute of Geological Survey, Urumqi 830000, Xinjiang, China;
3. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China;
4. Zhengzhou Trade and Industry School, Zhengzhou 450007, He'nan, China

Received Date: 09 July 2015

Revised Date: 01 December 2015

Publish Date: 15 June 2016

Abstract

Abstract

Cenozoic potassic volcanic rocks are widely distributed in the Tibetan Plateau, mainly in northern Tibet and Lhasa block with a few reports in Zhongba terrane. The study of Jiada potassic volcanic rocks found in Zhongba terrane shows that the rocks are almost exclusively trachyte, and the magma erupted incessantly by overflowing and erupting. These rocks are also characterized by high potassium and high aluminum, rich LILE, LREE and Sr, and poor HFSE,Y and Yb, with Eu negative anomaly. Their geochemi-cal characteristicss are similar to those of typical adkite rocks. The LA-ICP-MS zircon U-Pb age of trachyandesites is 17.03±0.32Ma, which means that these volcanic rocks were formed in Miocene. The Jiada potassic magma was derived from partial melting of thickened crust. The rocks represent post-collisional tectonic setting and extension environment.
- potassic volcanic rock /
- adakite /
- geochemical characteristics /
- LA-ICP-MS zircon U-Pb age /
- Zhongba terrane

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References

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