冈底斯印支晚期后碰撞花岗岩: 锆石U-Pb年代学及岩石地球化学证据

王程; 魏启荣; 刘小念; 丁鹏飞; 卜涛; 孙骥; 张小强; 王敬元

doi:10.3799/dqkx.2014.109

Volume 39 Issue 9

Sep. 2014

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Article Navigation > Earth Science > 2014 > 39(9): 1277-1288, 1300

Wang Cheng, Wei Qirong, Liu Xiaonian, Ding Pengfei, Bu Tao, Sun Ji, Zhang Xiaoqiang, Wang Jingyuan, 2014. Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry. Earth Science, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109

Citation:

Wang Cheng, Wei Qirong, Liu Xiaonian, Ding Pengfei, Bu Tao, Sun Ji, Zhang Xiaoqiang, Wang Jingyuan, 2014. Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry. Earth Science, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109

Citation:

Wang Cheng, Wei Qirong, Liu Xiaonian, Ding Pengfei, Bu Tao, Sun Ji, Zhang Xiaoqiang, Wang Jingyuan, 2014. Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry. Earth Science, 39(9): 1277-1288, 1300. doi: 10.3799/dqkx.2014.109

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Post-Collision Related Late Indosinian Granites of Gangdise Terrane: Evidences from Zircon U-Pb Geochronology and Petrogeochemistry

doi: 10.3799/dqkx.2014.109

Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2013-11-12
Publish Date: 2014-09-01

Abstract

Abstract

The lithology, LA-ICP-MS zircon U-Pb age, major and trace element geochemistry, Sr-Nd-Pb isotope compositions of Dabula pluton from the middle part of the Gangdise granitoid belt are systematically studied in the paper. Results suggest that the rock type is adamellite, and the pluton is composed of middle-fine grained border facies and middle-coarse grained central facies. The two facies yield weighted mean ages of 230.6±4.3 Ma-228.2±3.5 Ma, with the corresponding age of Late Triassic. The rocks are relatively rich in SiO₂ and kalium, with SiO₂ content between 71.79%-77.27%; relatively high K(w(K₂O)=4.06%-5.26%) and low Ti(w(TiO₂)=0.06%-0.40%) contents; A/CNK varies from 1.16-1.19, displaying strong peraluminous characteristics and sharp negative Eu anomalies (δEu=0.06-0.35). Trace element ratio spider diagram displays apparent enrichments of Rb, Th elements, and marked depletions of Ba, Nb, Sr, P and Ti The Sr-Nd isotopes show the granite bodies have the high initial ⁸⁷Sr/⁸⁶Sr ratios (0.712 7-0.720 1) and the negative ε_Nd(t) (-10.6) results. Pb isotope feature shows the enrichment of radiogenic Pb. It is concluded that the Dabula pluton was formed by partial melting of mature crustal materials from Gangdise resulted from the underplating of the subduction-related basaltic magmas during the post-collisional extention in the dynamic background associated with the southward Bangong-Nujiang Tethyan seafloor subduction triggered by the collision between the northern Australia and Lhasa terranes.
- late Indosinian granite,
- zircon U-Pb age,
- geochemistry,
- post-collision,
- Gangdise

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