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Zircon U–Pb dating and whole-rock elemental geochemistry of the Shazi anatase deposit in Qinglong,Western Guizhou,SW China

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Acta Geochimica 2017年第2期36卷 329-338页

作者： Jun Sun Zhao Jingyu Aiguo Nie College of Resource and Environment Engineering Guizhou University College of Resource and Environment Engineering Guizhou Institute of Technology Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior Institute of GeochemistryChinese Academy of Sciences

The Shazi deposit is a large-scale anatase deposit in Qinglong, Guizhou Province. Zircon grains from this deposit yielded a zircon U–Pb age of *259 Ma, representing the formation age of the deposit's parent *** age is identical to the eruption age of the Emeishan large igneous province, indicating a synchronous magmatic event. The rare-earth-element patterns of laterite samples were similar to those of the weathered basalt sample, and sub-parallel to those of the Emeishan high-Ti basalts,implying a genetic relationship between the laterite and the basalt. The Chemical Index of Alteration values of laterite ranged from 96 to 98, suggesting a high degree of weathering. SiO_2, MgO, and alkaline metal elements decreased with increasing degree of weathering, while Al_2O_3, Fe_2O_3,and TiO_2 increased. We found the highest TiO_2 in laterite and the lowest in pillow basalts, indicating that Ti migrated from basalt to *** U–Pb dating and whole-rock elemental geochemistry analyses suggest that the Emeishan basalt is the parent rock of the Shazi anatase ore *** on our analysis, we propose a metallogenic model to explain the ore-forming process, in which the karst terrain formed by the Emeishan mantle plume and the subsequent basaltic magma eruption were the key factors in the formation the Shazi anatase ore deposit.

关键词： anatase deposit Zircon U-Pb - Emeishan basalt Karst terrain

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Geology and Geochemistry of the Yangtizishan-Moshishan Metamorphosed Sedimentary anatase deposit in Zhenglan Qi,Inner Mongolia:Discovery of a New Genetic Type of Titanium deposit

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1419-1433页

作者： ZHAO Yiming LI Daxin WU Liangshi CHEN Wenming FENG Chengyou WANG Peihua GAO Xuedong Institute of Mineral Resources Chinese Academy of Geological Sciences Beij＇ing 100037 China

anatase and its allomorphic mineral rutile have the most prominent economic significance among titanium mineral resources and constitute one of the badly needed mineral resources currently in China. The Yantizishan-Moshishan anatase deposit was formerly referred to as an iron deposit. Based on recent investigation and exploration the authors believe that it is actually a large metamorphosed sedimentary anatase-dominated deposit belonging to a new genetic type. Ore bodies occur in stratoid and lenticular forms in Mesoproterozoic （1751 Ma） schist, metasandstone （metasiltstone）, and amphibolite. Rich ores have perthitic structure comprising chiefly interbedded quartz perthite （with disseminated anatase and rutile） and anatase perthite. Ore minerals are mainly anatase and subordinately rutile and ilmenite （±hematite）, while nonmetallic minerals are chiefly quartz with a certain amount of anthophyllite and biotite （±garnet）. The grain sizes of anatase, ruffle and ilmenite are 0.01-0.1 mm. Rich ores contain 3.14% to 15.46% TiO2. averaging 6.91%, while the low-grade ores have TiO2 content about 1.2%to 2.97%, averaging 1.76%. The ores have relatively high TFe and V contents. Trace elements in anatase and rutile such as Nb and Cr were analyzed by the electron microprobe. According to their relatively low Nb and Cr contents, source anatase and rutile must have come from meta-mafic rocks. Trace elements of the associated ilmenite show relatively high MnO and low MgO contents, just in contrast to those of ilmenite in V-Ti-magnetite ores of magmatic origin. The protoliths of amphibolite wall rocks should be basalt and picrite-basalt. Pertochemical data suggest that the tectonic setting of these rocks belongs to an island arc or a transitional belt between the island arc and oceanic ridge. Silicon isotope study shows that δ30Si values of different anatase ores, quartzite, and schist in this deposit are 0.1‰ to -0.9‰, similar to those of marine hydrothermal exhalative sedimentary

关键词： geology geochemistry anatase deposit new type Yangtizishan-Moshishan Inner Mongolia

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