Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1405-1417.doi: 10.13278/j.cnki.jjuese.201505113

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Zircon U-Pb Chronology,Geochemical Characteristics and Significance of Diorites in Mining Area of Zhazhalong in Mid-Gangdese

Wei Qirong, Liu Xiaonian, Ding Pengfei, Wang Cheng, Wang Jingyuan, Sun Ji, Zhang Xiaoqiang, Bu Tao, Gao Manxin   

  1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
  • Received:2014-12-12 Published:2015-09-26

Abstract:

Zhazhalong area is located in the Middle of Gangdese and also on the west part of Longgeer-Nyainqentanglha Fe, Cu, Pb, Zn, Ag metallogenic belt in Tibet. The petrology, LA-ICP-MS zircon U-Pb dating, and lithogeochemical characteristics show that the main rock type is diorite with individual quartz diorite. The LA-ICP-MS zircon U-Pb age of the diorites is (64.15±0.52) Ma which indicates that the rocks were formed in the Early Paleocene. The diorites are meta-aluminous to per-aluminous(A/CNK date is 0.89-1.06), and belong to the high-K calc-alkaline series. The characters of REE are right-incline and LREE enrichment (LaN/YbN date is 1.78-2.08) with weak Eu anomaly(δEu date is 0.65-0.81). The characters of trace elements are rich in K, Th and depleted of Nb, P, Ti intensively. By synthesis analysis, the origin of the rocks was a mixture of crust-mantle, and they were formed in the subduction of Yarlung Zangbo Oceanic crust. This implies that the time of the collision between India and Asia land should be later than 65 Ma.

Key words: diorites, zircons U-Pb chronology, petrological geochemistry, mining area of Zhazhalong, Mid-Gangdese

CLC Number: 

  • P597.1

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