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2017, 36(2) 428-440 DOI:
10.3969/j.issn.1004-5589.2017.02.010 ISSN: 1004-5589 CN: 22-1111/P |
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Chronology and geochemistry of meta-basic volcanics of Baiyinnuoer region in Wenduermiao area,Inner Mongolia |
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LI Shang-qi1, CHEN Yue-jun2, HAN Ren-dao3, LI Sen-lin1, SHI Qiang1, WU Guo-xue1 |
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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 |
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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. |
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Keywords��
Baiyinnuoer
meta-basic volcanics
zircon U-Pb ages
geochemistry
ophiolite
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Received 2016-10-26 Revised 2016-12-10 Online: |
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DOI: 10.3969/j.issn.1004-5589.2017.02.010 |
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Email: wuguoxue@163.com |
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