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Rb－Sr ISOTOPE DATING ON FENITES FROM BAYANOBO，innermongolia，CHINAAND THEIR GEOLOGICALIMPLICATIONS

Scientia Geologica Sinica 1994年第4期 457-467页

作者： Yang Xueming(Department of Earth and Space Sciences, China University of Science and Technology, Hefei 230026) Zhang Peishan Tao Kejie Zhang Rengu(Institute of Geology, Chinese Academy of Sciences Beijing 100029)Yang Xiaoyong(Department of Earth and Spa

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关键词： Rb innermongolia CHINAAND THEIR GEOLOGICALIMPLICATIONS Sr ISOTOPE DATING ON FENITES FROM BAYANOBO

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Magnetic Fabric Study of Late Holocene Sediments in Huangqihai Lake,Inner Mongolia and its Sedimentary Significance

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 186-196页

作者： DONG Jin GAO Rui WANG Yong ZHANG Shihong YAO Peiyi CHI Zhenqing ZHAO Zhili Institute of Geology Chinese Academy of Geological Sciences Key Laboratory of Earth Probe and Geodynamics Ministry of Land and Resources of the People's Republic of China State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

The detailed magnetic susceptibility anisotropy study on the sediments of two sections, which are located in the lake-center and the lakeshore of the Huangqihai Lake, Inner Mongolia, revealed their hydrodynamics and sedimentary environment changes in the recent 2000 years. The results show that the sediments of two sections both display normal depositional magnetic fabrics, of which the minimum susceptibility axes （K3） are oriented perpendicular to the bedding plane and the maximum magnetic susceptibility axes （K~） lie parallel with the bedding plane. In addition, the iakeshore presents higher magnetic anisotropy degree （P）, magnetic foliation （F） and current factor （F~） than the lake-center, showing that the lakeshore has higher flow velocity. For the west Huangqihai Lake （HQW） section in the lake-center, the magnetic matrix grain degree （Q） and the inclination of the minimum susceptibility axes sharply increased and decreased, respectively, at a depth of about 10 cm, 24 cm, 45 cm and 74 cm, which indicate abnormal depositional events with strong kinetic energy. Through comparative analysis, the HQW section can be divided into three stages from top to bottom. The upper stage was a stable depositional environment with strong hydrodynamic energy and low water level, which shows relatively higher Fs value and the Q value varies similarly with P and F. The middle stage was a stable depositional environment with high water level and low hydrodynamic energy, intermitted with high-energy abnormal events, which shows relatively lower Fs and the Q value was negatively correlated with P and F. The lower stage was an unstable depositional environment with low hydrodynamic energy and high water level, which shows relatively lower P, F, and F~ value.

关键词： magnetic fabric hydrodynamics sedimentary environment Huangqihai Lake innermongolia

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The Discovery of Diamonds in Chromitites of the Hegenshan Ophiolite,Inner Mongolia,China

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 341-350页

作者： HUANG Zhu YANG Jingsui Paul T.ROBINSON ZHU Yongwang XIONG Fahui LIU Zhao ZHANG Zhongming XU Wei CARMA State Key Laboratory of Continental Tectonics and DynamicsInstitute of GeologyChinese Academy of Geological Sciences China University of Geosciences Inner Mongolia No.9 Geology Mineral Exploration and Development Institute Institute of Mineral Resources Chinese Academy of Geological Sciences 101 Geological Team of Sichuan Bureau of Geology and Mineral Resources

Diamond, moissanite and a variety of other minerals, similar to those reported from ophiolites in Tibet and northern Russia, have recently been discovered in chromitites of the Hegenshan ophiolite of the Central Asian Orogenic Belt, north China. The chromitites are small, podiform and vein-like bodies hosted in dunite, clinopyroxene-bearing peridotite, troctolite and gabbro. All of the analysed chromite grains are relatively Al-rich, with Cr^# [100Cr/（Cr＋Al）] of about 47-53. Preliminary studies of mainly disseminated chromitite from ore body No. 3756 have identified more than 30 mineral species in addition to diamond and moissanite. These include oxides （mostly hematite, magnetite, ruffle, anatase, cassiterite, and quartz）, sulfides （pyrite, marcasite and others）, silicates （magnesian olivine, enstatite, augite, diopside, uvarovite, pyrope, orthoclase, zircon, sphene, vesuvianite, chlorite and serpentine） and others （e.g., calcite, monazite, glauberite, iowaite and a range of metallic alloys）. This study demonstrates that diamond, moissanite and other exotic minerals can occur in high-Al, as well as high-Cr chromites, and significantly extends the geographic and age range of known diamond-bearing ophiolites.

关键词： diamond moissanite deep mantle minerals chromitites Hegenshan ophiolite innermongolia

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