河北省尚义县松树沟石墨矿矿床地球化学特征及成因分析

Geochemical characteristics and genesis analysis of Songshugou graphite deposit in Shangyi County of Hebei Province

以河北省尚义县松树沟石墨矿的地球化学特征数据为基础,通过与内蒙古兴和石墨矿床进行对比,探究矿床成矿环境,进而分析其矿床成因。岩石学和地球化学分析结果表明:松树沟石墨矿赋矿层位为集宁岩群下白窑岩组,矿石类型为黑云斜长变粒岩石墨矿石,工业类型为晶质鳞片状石墨;岩石地球化学特征为高硅、高铝、低碱,具有孔兹岩系特征;原岩形成在缺氧的弱还原环境,具铕负异常特征;其变质原岩为富碳质和富铝质的泥质碎屑岩,原岩沉积环境总体为准稳定地理环境,岩石通过区域变质作用形成晶质石墨矿床。对松树沟石墨矿床地质特征和区域成矿规律的研究成果,对区域找矿工作具有重要的参考意义。

On the basis of the geochemical characteristics data of Songshugou graphite deposit in Shangyi County of Hebei Province,the authors analyzed the metallogenic environment and genesis of the deposit by comparing these with Xinghe graphite deposit.The results of petrological and geochemical analysis show that Songshugou graphite deposit is hosted in lower Baiyao Formation of Jining Group.The ore type is biotite plagioclase granular rock graphite,and the industrial type is crystalline flake graphite.The lithogeochemical characteristics show high silicon,high alumina and low alkali features of khondalite.The primary rocks were formed in an oxygen-deficient weak reduction environment with negative europium anomaly.The metamorphic primary rocks are carbonaceous and alumina-rich argillaceous clastic rocks,and the sedimentary environment of the primary rocks is generally a quasi-stable geographic environment,forming crystalline graphite deposits through regional metamorphism.The research of geological characteristics and regional metallogenic regularity of Songshugou graphite deposit is of great significance for regional prospecting work.