Geochemical characteristics, formation age and tectonic environment of the Mankeyidingsayi rocks in the Wuxilike area of Altay

ZHANG Xiangyun; WANG Genhou; ZHAO Jun; CUI Xiaofeng; BAI Xiang; NIE Xiaoyong

2016 Vol. 35, No. 8

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ZHANG Xiangyun, WANG Genhou, ZHAO Jun, CUI Xiaofeng, BAI Xiang, NIE Xiaoyong. Geochemical characteristics, formation age and tectonic environment of the Mankeyidingsayi rocks in the Wuxilike area of Altay[J]. Geological Bulletin of China, 2016, 35(8): 1376-1387.

Citation:

ZHANG Xiangyun, WANG Genhou, ZHAO Jun, CUI Xiaofeng, BAI Xiang, NIE Xiaoyong. Geochemical characteristics, formation age and tectonic environment of the Mankeyidingsayi rocks in the Wuxilike area of Altay[J]. Geological Bulletin of China, 2016, 35(8): 1376-1387.

Geochemical characteristics, formation age and tectonic environment of the Mankeyidingsayi rocks in the Wuxilike area of Altay

1. China University of Geosciences, Beijing 100083, China;
2. No.8 Gold Geological Party of CAPF, Urumuqi 830057, Xinjiang, China;
3. He'nan Institute of Geological Survey, Zhengzhou 450001, He'nan, China

Received Date: 27 April 2016

Revised Date: 25 May 2016

Publish Date: 15 August 2016

Abstract

Abstract

The Wuxilike area of Altay is located in Siberian Altay terrigenous mobile belt and the Altay Paleozoic plutonic magmatic arc, where granite is widely distributed. By LA-ICP-MS zircon U-Pb dating and geochemical analysis, the authors studied the age and tectonic environment of the Makeyidingshayi granite body. The LA-ICP-MS zircon U-Pb age of the medium-fine grained muscovite adamellite of Mankeyidingsayi granite body in southern Wuxilike area is 217.9±2.3Ma, showing that the granite body was emplaced in the early Late Triassic of the early-Mesozoic. The rocks have high SiO₂ (70.86%~74.32%) and Al₂O₃ (14.51%~14.96%), low P2O5 (0.24%~0.33%) and MgO+FeO (0.39%~1.25%) content, high alkali (K₂O+Na₂O=8.07%~8.29%), and low CaO/Na₂O (0.13~0.30, ≤0.3) ratio. These characteristics indicate that the granite body belongs to high-K calc-alkaline peraluminous rocks, with the typical features of S-type granites. In combination with the work and the results from previous comprehensive analysis, the authors infer that the granite body was formed in an intercontinental (inland) environment, related to the mantle plume. The granite body was mainly derived from partial melting of argillaceous sediments in the crust, and during the partial melting process, residuals of calcium-rich plagioclase, ilmenite and other minerals were preserved.
- geochemical characteristics; formation age; tectonic environment; Mankeyidingsayi; Wuxilike; Altay

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References

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