帕米尔东北缘穷阿木太克岩体年代学、地球化学特征及地质意义

doi:10.13278/j.cnki.jjuese.201601111

Abstract

Abstract:

Qiong' amutaike pluton located at Qiangtang block in the northeastern Pamir has a close relationship with Bangong Lake-Nujiang suture zone. The granitic rocks are composed mainly of tonalite, granodiorite, and monzogranite. The zircon U-Pb SHRIMP dating of Qiong' amutaike pluton yields the concordant age of (107.0±1.2) Ma (MSWD=0.55), indicating a Late Early Cretaceous. The geochemical analysis shows that the major elements are characterized by high CaO (2.08%-4.21%), K₂O (2.16%-5.13%), alkali (K₂O+Na₂O=5.19%-8.00%), and slightly high Al₂O₃ (13.79%-16.62%), suggesting that the granites belong to the typical calc-alkaline series. The samples are enriched in LREE (light rare earth elements) and depleted of HREE (heavy rare earth elements) with slight Eu anomalies (δEu=0.51-0.76). The chondrite normalized REE pattern curve shows right-sloping type. The trace element studies demonstrate an enrichment of Rb, Th, U, K and depletion of Nb, Ta, Ti, and Hf. The granites might be the product of basic rocks from melting or partial melting of the lower crust. Based on the tectonic environment of the region, we suggest that Qiong' amutaike pluton and evolved into the rich-potassium series from the mid-potassium calc-alkali rock series, generated in a transitional setting of syn-collisional (compressional) and post-collisional (extensional), indicating the collision between Qiangtang massif and Gangdisi massif. These rocks are post-orogenic granites.

Key words: Northeastern Pamir, Qiong' amutaike pluton, zircon U-Pb geochronology, geochemistry

CLC Number:

P588.12

Zeng Zhongcheng, Lin Lujun, Zhu Haiping, Liu Ming, Liang Bin, Gao Qianqian, Peng Jianming. Geochronological and Geochemical Characteristics and Tectonic Implications of Qiong' Amutaike Pluton in Northeastern Pamir[J].Journal of Jilin University(Earth Science Edition), 2016, 46(1): 119-134.

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Geochronological and Geochemical Characteristics and Tectonic Implications of Qiong' Amutaike Pluton in Northeastern Pamir

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