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DISCOVERY AND GEOLOGICAL SIGNIFICANCE OF THE LATE NEOPROTEROZOIC GRANITE IN HUANERKU, DAXINGANLING REGION |
LIU Yu-wai1, DU Bing-ying1, ZHANG Tie-an1, ZHAO Ming-sheng2, ZHAO Yu-sheng1, LIU Yu-qi1, ZHEN Miao1, LUO Jia-xin1 |
1. Heilongjiang Institute of Regional Geological Survey, Harbin 150080, China; 2. College of Paleontology, Shenyang Normal University, Shenyang 110034, China |
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Abstract The latest research shows that the assemblage of ophiolite is developed in Jifeng, Gaxian and Huanerku areas along the eastern part of Xinlin-Xiguituqi fault in Daxinganling Mountains. Based on the study, the LA-ICP-MS zircon U-Pb age of 557.2±2.2 Ma is obtained from the granite in the ophiolitic melange in Huanerku area, indicating it was formed in Neoproterozoic period. The rock is generally characterized by slightly poor alkali, weakly peraluminous calc-alkaline with indistinct negative Eu anomaly, enrichment of LREEs and Hf, Ba, Nd and U, and relative depletion of Th, Nb, Ta and Zr, belonging to weak peraluminous calc-alkaline I-type granite. Considering the existence of Neoproterozoic ocean basin in Xinlin-Jifeng area, it is concluded that the granite is possibly the product of ocean subduction.
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Received: 10 January 2017
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