Geological Characteristics and Genesis of the Xianghe Crystalline Graphite Deposit in Shangnan County of Shaanxi Province
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摘要: 新发现的商南湘河晶质石墨矿位于秦岭-大别新元古—中生代造山带，赋存于新太古界—古元古界陡岭岩群湘河片麻岩中，目前圈定晶质石墨矿体33条，初步估算晶质石墨矿物量达超大型规模。笔者在成矿地质背景、矿床地质特征、矿床地球化学、矿石矿物赋存状态及特征研究的基础上，对矿床的成因进行了初步探讨，对找矿标志进行总结。研究表明：含矿岩性主要为石墨（黑云）斜长片麻岩，原岩为富含碳质的细碎屑岩，石墨中的碳质来源主要为生物有机碳，矿床成因类型为区域变质型，后期热液变质及构造改造特征明显。Abstract: The newly discovered Xianghe crystalline graphite deposit is located in the Qinling-Dabie orogenic belt, hosted in Neoarchean-Paleoproterozoic Douling Group Xianghe gneiss. 33 crystalline graphite ore bodies have been circumcribed here and the mineral content is preliminarily estimated to be a massive scale. This paper discussed the genesis of the deposit and summarized the prospecting criteria on the basis of the metallogenic background, Geological features of the ore deposit, geochemistry of mineral deposits and geochemistry characteristics, and the occurrence state and characteristics of ore mineral. Research shows that the ore-bearing rock is graphite-bearing plagioclase gneiss. The Carbon sources of the graphite deposit are derived from organic matter. Comprehensive studies of the Xianghe crystalline graphite deposit show that the genetic type of the deposit is regional metamorphic-type graphite deposit, and it has a later distinctive hydrothermal and tectothermal transformation.
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