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ZIRCON U-Pb GEOCHRONOLOGY OF BASHENGHE PLUTON IN NORTHERN DAXINGANLING MOUNTAINS: Geological Implications |
CHEN Hui-jun, CUI Tian-ri, QIAN Cheng, LI Lin-chuan, CHEN Jing-sheng, LI Wei, WU Xin-wei, JIANG Bin, SI Qiu-liang, QIN Tao, TANG Zhen, ZHANG Yu-jin, GUO Wei |
Shenyang Center of Geological Survey, CGS, Shenyang 110034, China |
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Abstract The Bashenghe pluton in Zhalantun area of northern Daxinganling Mountains is composed of alkali-feldspar granite. The zircon LA-ICP-MS U-Pb dating yields the weighted mean age of 297.8±3.6 Ma, indicating the pluton was formed in the Early Permian. The whole rock geochemistry of 4 samples shows that the alkali-feldspar granite is characterized by rich Si, high K and rich alkali, belonging to weak peraluminous shoshonite series. The characteristics of high ∑REE, obvious negative Eu anomalies and enrichment of LILEs are properties of A-type granite. Combined with previous research results and isotopic chronology, it is concluded that the convergence of Xing'an massif and Songnen massif occurred before 298 Ma.
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Received: 19 January 2019
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