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Molar-Tooth Structure from the Mesoproterozoic Wumishan Formation in Lingyuan,yanshan region,North China,and Geological Implications

引用

Acta Geologica Sinica(English Edition) 2012年第1期86卷 85-95页

作者： KUANG Hongwei LIU Yongqing PENG Nan LUO Shunshe LI Jiahua CEN Chao CHEN Mingpei Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education of China School of Geophysics and Oil Resources of Yangtze University JingzhouHubei 434023China China University ofGeosciences Beijing 100083China School of Geosciences of Yangtze University Jingzhou Hubei 434023China

Although its origin has not yet reached a consensus so far, MTS （Molar-Tooth Structure） has been documented for more than 100 years. Current study reports a discovery of MTS from the Mesoproterozoic Wumishan Formation, Lingyuan, yanshan region, North China, and the features and geological implications of MTS are further discussed. Here, straitigraphic horizons of MTS＇s occurrences show that it was mainly located within the top part of the Wumishan Formation, i.e., limestone unit. Four kinds of morphology of MTS, i.e., fine fusiform, debris, ribbon, ptigmatic and nodular （irregular）, were recognized and thought to be highly related to the sedimentary environments and facies. Geochemistry of MTS including oxides, trace elements and C, O and Sr isotopes indicates that the horizons of MTS-bearing is of higher Sr/Ba and Ca/Mg ratios, lower positive ~13C and highly negative 3180 values than the adjacent stratigraphic levels of rare MTS. Lithology, morphology and geochemistry of MTS in the Wumishan Formation suggest that MTS occurs mainly in shallow subtidal near the storm wave base, which is typically characterized by warm temperature, oversaturated calcium carbonate seawater and high organic productivity. Furthermore, occasional enrichment of algae bacteria here is more favorable for the calcification of calcium oozes and catalytic for MTS. C isotope composition of the Wumishan Formation and MTS of this study is well correlated with that of the Mesoproterozoic Belt Supergroup, North America and Riphean, Siberia, suggesting that MTS acts as a sedimentary record responding to global changes and is a perfect indicator in Precambrian stratigraphic correlation worldwide.

关键词： Molar-tooth Structure Wumishan Formation Mesoproterozoic Implications Lingyuan yanshan region

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