| 山西省大同市新荣区石墨矿岩石矿物地球化学特征与成因 |
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| 关键词:Xinrong District of Datong City scaly graphite protolith recovery rare-earth element element ratio Negri value genetic type |
| 基金项目:山西省矿业权价款地质勘查项目“山西省大同市新荣区七里村-碓臼沟石墨矿详查项目”(编号: SXZDF20170820);“山西省大同市新荣区白山村石墨矿详查项目”(编号: HXCT01-2018F005) |
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| Research on Geochemistry Characteristics and Genesis of the Graphite Deposit in Xinrong District of Datong City, Shanxi Province |
| The NE-SW trending graphite belt (graphite-bearing oblique gneiss) extends for more than 22 km in Xinrong District of Datong City. Although 50 million tons of scaly graphite mineral resources were prospected along the ore belt, the study of the genetic type of the deposit in this area is relatively insufficient. Based on local geological information and analytical results, the authors determined the genesis of the deposit by restoring the original of metamorphic rock in this paper. The belt was deeply metamorphosed from sedimentary rock as shown by qualitative judgment from the geological attitudes and combination, petrographic signs, and secondary mineral characteristics. The element ratio (Sr:Ba, etc.) and rare-earth element curves show that the ore and its surrounding rocks experienced metamorphism from sedimentary rock. Combined with TiO2-F diagram, [(al+fm)–(c+alk)]/Si diagram and (al–alk):c in the petrochemical characteristics, the authors gradually determined the range of the original rock, and finally detected that the clay rocks were dominantly the original rocks in Xinrong District. It is concluded that the genetic type of the graphite ore belt in Xinrong District is a region of deep metamorphism of clay rocks, and this finding fills the gap of the study of the genesis type of the deposit in this region and provides the basis for further prospecting and geological modeling. |
| LIANG Yu-qi,ZHAO Yong,WU Guang-cun,ZHANG Yue,XIA Qing-lin.2020.Research on Geochemistry Characteristics and Genesis of the Graphite Deposit in Xinrong District of Datong City, Shanxi Province[J].Acta Geoscientica Sinica,41(6):827-834. |
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