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ZHU Jie, LI Qiugen, WANG Zongqi, TANG Haoshu, CHEN Xu, XIAO Bing. Magmatism and Tectonic Implications of Early Cambrian Granitoid Plutons in Tianshuihai Terrane of the Western Kunlun Orogenic Belt, Northwest China[J]. Northwestern Geology, 2016, 49(4): 1-18.
Citation: ZHU Jie, LI Qiugen, WANG Zongqi, TANG Haoshu, CHEN Xu, XIAO Bing. Magmatism and Tectonic Implications of Early Cambrian Granitoid Plutons in Tianshuihai Terrane of the Western Kunlun Orogenic Belt, Northwest China[J]. Northwestern Geology, 2016, 49(4): 1-18.
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Magmatism and Tectonic Implications of Early Cambrian Granitoid Plutons in Tianshuihai Terrane of the Western Kunlun Orogenic Belt, Northwest China

  • 1.

    The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China

  • 2.

    Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

  • 3.

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550008, China

  • 4.

    Department of Energy and Mineral Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, US

Received Date:  30 June 2016
Revised Date:  22 August 2016
Publish Date:  15 December 2016
    Abstract
  • The Ayilixi and Warengzilafu plutons are located in the Tianshuihai terrane of the Western Kunlun Orogenic Belt (WKOB).Detailed LA-ICP-MS zircon U-Pb dating has yielded the crystallization ages of ca. (530±6) Ma and ca. (515±2) Ma for the Ayilixi pluton and Warengzilafu pluton, respectively, signifying their formation in Cambrian. The Ayilixi rocks are high-K calc-alkaline to shoshonitic granite porphyries, with a limited range of SiO2 (67.7%~69.4%), high Mg# (44~46), A/CNK ratios (0.81~0.93) and K2O (2.15%~3.02%). They are also marked by negative εHf(t) values of -3.3 to -0.8, obviously fractionated between light and heavy rare earth element, enrichments in Cs, Rb, K, Th, Zr, Hf, Y, and depletions in Ba, Nb, Ta, Sr, P, T. They are considered to have been most likely derived from magma mixing processes by mantle-derived magma and crustal magmatic melt. The Warengzilafu biotite monzonitic granite gneisses are high-K calc-alkaline and peraluminous. Compared to the rocks of the Ayilixi pluton, they generally have higher SiO2 (75.0%~76.3%), lower Mg# (18~26), with higher A/CNK ratios (1.01~1.30) and positive εHf(t) values of +2.5 to +4.3. Elemental and isotopic data suggest that the Warengzilafu rocks are highly fractionated I-type granites, which were mainly generated by partial melting of high-K calc-alkaline andesite and basaltic andesite. The two plutons represent the early Cambrian magmatism under island-arc setting in Tianshuihai terrane, which are related to the subduction of Proto-Tethys.
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