ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET

NIMA Ciren; WANG Guocan; DU Dun; PU Chi; Ciren Yangzong; JIAO Wenlong; Li Kaiyun; YE Qiang; LUOSANG Langjie; DA Wa

2017 Vol. 23, No. 5

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NIMA Ciren, WANG Guocan, DU Dun, PU Chi, Ciren Yangzong, JIAO Wenlong, Li Kaiyun, YE Qiang, LUOSANG Langjie, DA Wa. ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET[J]. Journal of Geomechanics, 2017, 23(5): 673-685.

Citation:

ZIRCON U-PB AGES, GEOCHEMICAL CHARACTERISTICS AND TECTONICS IMPLICATIONS OF LATE JURASSIC INTERMEDIATE INTRUSIVE ROCKS IN SHIQUANHE AREA, WESTERN TIBET

1.
Regional Geological Survey Team, Tibet Autonomous Region Geological and Mineral Exploration And Development Bureau, Duilongdeqing 851400, Tibet, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei, China

Received Date: 10 December 2016

Publish Date: 25 October 2017

Abstract

Abstract

A set of intermediate intrusive rocks have been identified from a late Cretaceous pluton which intruded into the Paleozoic stratigraphy along the south of Shiquanhe belt, during the 1:50000 geological survey in the Gaer area. The intrusive rocks are exhibited as stock and apophyse, with the types of quartz diorite, tonalite and granodiorite. The zircon from quartz diorites and tonalites yield U-Pb ages of 157.3±1.5 (MSWD=0.96) and 159.3±3.7 Ma (MSWD=2.30) with LA-ICP-MS method, indicating late Jurassic magmatic activities. These intermediate-acid intrusive rocks have a SiO₂ content of 59.65%~64.57%, K₂O of 1.95%~2.54%, Na₂O of 1.97%~2.54%, K₂O/Na₂O of 0.77%~1.29%, P₂O₅ of 0.085%~0.139%, Al₂O₃ of 13.63%~15.68% and A/CNK value of 0.89~1.04, which could belong to meta-aluminous rocks. The REE content of these rocks range from 107.37×10^-6 to 148.33×10^-6 with high grade fractionation of LREE/HREE (6.77~9.67) and some negative anomaly of Eu (0.63~0.84). Compared with the primitive mantle, all rocks are enriched in large ion lithophile elements (Rb and Th et al) and depleted in high field strength elements (Nb, Ta, Ti and P et al) with geochemical characteristics of the island arc calcalkaline magma. Petrological and geochemical characteristics indicate that the rocks have acidic rule of evolution, with the features of comagmatic evolution and typical I-type granite, and they were formed in the island arc environment with plate subduction. This research also indicates that subduction-type granite already existed in the Shiquanhe area during late Jurassic, and the magmatic activities were likely the product of subducted southward from Northern subzone in Shiquanhe area.
- Shiquanhe area /
- intermediate intrusive rocks /
- LA-ICP-MS zircon U-Pb /
- late Jurassic

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