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BU Tao, WEI Qirong, DING Pengfei, WANG Cheng, LIU Xiaonian, ZHANG Xiaoqiang, SUN Ji, WANG Jingyuan. 2015: LA-ICP-MS zircon U-Pb ages and petrogenesis of Rindu intrusion near Namling, middle Gangdise magmatic belt. Geological Bulletin of China, 34(12): 2254-2265.
Citation: BU Tao, WEI Qirong, DING Pengfei, WANG Cheng, LIU Xiaonian, ZHANG Xiaoqiang, SUN Ji, WANG Jingyuan. 2015: LA-ICP-MS zircon U-Pb ages and petrogenesis of Rindu intrusion near Namling, middle Gangdise magmatic belt. Geological Bulletin of China, 34(12): 2254-2265.
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LA-ICP-MS zircon U-Pb ages and petrogenesis of Rindu intrusion near Namling, middle Gangdise magmatic belt

  • MLR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi，an Center of Geological Survey, CGS, Xi'an 710054, Shaanxi, China;2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei, China

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  • This paper reports LA-ICP-MS zircon U-Pb ages and whole rock major and trace element analyses of two-mica granite in the middle part of the Gangdise terrane, Tibet. Magma zircons from the two-mica granite yielded a weighted 206Pb/238U mean age of 226.3±0.98Ma. The two-mica granite is of strongly peraluminous high-K calc-alkaline series, with SiO2 values from 72.83% to 74.99%, K2O/Na2O values from 1.58 to 2.37, total alkali content from 7.37% to 8.72%, A/CNK ratios from 1.21 to 1.39(>1.1), and ω(C-norm) higher than 1%. The ∑REE values vary from 61.71×10-6 to 175.16×10-6, LREE from 53.93×10-6 to 165.49×10-6, HREE from 7.588×10-6 to 13.880×10-6, REE patterns are inclined toward the HREE side with intensive enrichment of LREE, and (La/Yb)N values are from 10.49 to 42.17. Eu anomalies are strong, with Eu/Eu? values varying from 0.264 to 0.57. In the primitive mantel-normalized spidergrams of trace elements, the depletion of Ba, Nb, Sr, Ti and enrichment of Rb, K, U are obvious. It is suggested that the magma for the two-mica granite was dominantly derived from partial melting of argillaceous rocks in the crust, induced by dehydration of mica minerals.
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