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HU Jichun, CHEN Jing, HE Shuyue, LI Yulong, SHU Shulan, WANG Yadong. Geochronology and Petrogenesis of Mylonitized Granite from Wulonggou Area in East Kunlun and Its Tectonic Significance[J]. Northwestern Geology, 2017, 50(3): 54-64.
Citation: HU Jichun, CHEN Jing, HE Shuyue, LI Yulong, SHU Shulan, WANG Yadong. Geochronology and Petrogenesis of Mylonitized Granite from Wulonggou Area in East Kunlun and Its Tectonic Significance[J]. Northwestern Geology, 2017, 50(3): 54-64.
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Geochronology and Petrogenesis of Mylonitized Granite from Wulonggou Area in East Kunlun and Its Tectonic Significance

  • 1.

    Key Laboratory for Studying the Geological Processes and Mineral Resources in North Qinghai-Tibet Plateau, Qinghai Geological Survey Institue, Xining 810012, Qinghai, China

  • 2.

    The third Institute of Geology and Mineral Resources Prospecting in Qinghai Province, Xining 810029, Qinghai, China

Received Date:  18 February 2017
Revised Date:  10 July 2017
Publish Date:  15 September 2017
    Abstract
  • The mylonited granite is located at Shenshuitan mining setion of Wulonggou area in the middle part of the East Kunlun, with a yielded LA-ICP-MS zircon U-Pb age of 389.7±3.9Ma. This granite has high SiO2 (74.86%~76.64%), K2O (5.20%~6.06%) and total alkali content (K2O + Na2O=8.05%~8. 83%) values. The samples are characterized by strong loss in Ba, Nb-Ta, Sr, P and Ti, as well as strong negative Eu anomaly (δ Eu=0.07~0.12), which shows characteristics of A type granite. Combined with the studies of Silurian-Devonian magmatic rocks in this studying area, it's proposed that the East Kunlun Orogenic belt has entered the post-collision stage in early Devonian, and the most intense of extension was happened in the conversion period of from early Devonian to middle Devonian, forming A type granite with considerable size, and standing for the end of the Caledonian orogenic cycle.
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