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The Geochemical Characteristics of the Pana Volcanic Rocks of the Linzizong Group in the Zhaxue Area, Linzhou County,Tibet and Its Geological Implication

HUANG Ying-cong, YANG De-ming, ZHENG Chang-qing,HE Zhong-hua，DAI Lin-na, LI Jian-guo,ZHANG Yao-yu   

  1. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2004-10-22 Revised:1900-01-01 Online:2005-09-26 Published:2005-09-26
  • Contact: HUANG Ying-cong

Abstract: The Pana volcanic rocks of the Linzizong Group in Zhaxue area, Linzhou County, Tibet are mainly composed of rhyolitictrachy lavas and volcanoclastic rocks. Its geochemical characteristics (14.55% of Al2O3 8.78% of K2O+Na2O, 5.77% of K2O, K2O/Na2O=2.07) suggest that the Pana Formation volcanic rocks belong to highAl, highK calcalkalineshoshonite series. LREE in the volcanic rocks were slightly enriched with moderate to strong Eu anomalies. In the volcanic rocks, Rb and Th were intensively enriched, Ta, Ba and U moderately enriched while Y, Yb and Sr relatively depleted. The lithogeochemical study suggests that the Pana Formation volcanic rocks were formed about 40 Ma by anatexis of the thickened continental crust in the postcollision process between Indo plate and Eurasia plate.

Key words: lithogeochemistry, partial melting, postcollision, Tibet

CLC Number: 

  • P585.1
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