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Chronology and geochemistry of meta-basic volcanics of Baiyinnuoer region in Wenduermiao area,Inner Mongolia
LI Shang-qi1, CHEN Yue-jun2, HAN Ren-dao3, LI Sen-lin1, SHI Qiang1, WU Guo-xue1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Research Center of Paleontology & Stratigraphy, Jilin University, Changchun 130026, China;
3. No.3 Bureau of China Metallurgical Geology Bureau, Taiyuan 030000, China
Abstract:

LA-ICPMS zircon U-Pb dating and geochemical data of meta-basic volcanics of Baiyinnuoer region from Wenduermiao area in central Inner Mongolia were studied. The results indicate that the meta-basic volcanics formed in (254.8±6.2)Ma, belonging to Late Permian. Meanwhile, geochemical studies show that the meta-basic volcanics belongs to sub-alkaline tholeiitic series. The rocks were obviously depleted in (LILE) Ba, Rb, Sr and rich in (HFSE) Nb and Zr, with positive anomalies of Eu. Geochemistry analysis shows that meta-basic volcanics are very similar to E-MORB, and the magma was derived from enriched lithospheric mantle. Combining with the geology features the rocks should belong to the ophiolite component, which indicates that Paleo-Asian Ocean has not been closed in the Late Permian and the closing time of Paleo-Asian Ocean should be later than the Early Triassic.

Keywords: Baiyinnuoer   meta-basic volcanics   zircon U-Pb ages   geochemistry   ophiolite  
�ո����� 2016-10-26 �޻����� 2016-12-10 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2017.02.010
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