湖北广水—红安一带晶质石墨成矿地质特征及成因探讨

Metallogenic Geological Characteristics and Cause of Crystalline Graphite in Guangshui-Hong'an Area,Hubei Province

广水—红安一带为湖北省晶质石墨成矿区带之一,已发现芦花湾、七角山等共6处晶质石墨矿床(点),中元古代红安岩群黄麦岭组下段(Pt_(2)h^(1))、七角山组下段(Pt_(2)q^(1))为石墨赋矿层位,矿石为小鳞片晶质石墨,矿体呈低电阻率、高极化率、自然电位负异常的特征,石墨矿主要受地层控制,成矿经历了沉积成岩、区域变质作用两个阶段,为区域变质型矿床。

The Guangshui-Hong'an area is one of the crystalline graphite mineralization zones in Hubei Province.A total of 6 crystalline graphite deposits(points)have been discovered in Luhuawan and Qijiaoshan,and the lower member of the Huangmailing formation of the mesoproterozoic hongandite group(Pt_(2)h^(1)),the lower member of the Qijiaoshan formation(Pt_(2)q^(1))is the graphite ore-bearing horizon.The ore is small-scale crystalline graphite.The ore body is characterized by low resistivity,high polarizability,and negative natural potential.Graphite ore is mainly controlled by strata.After two stages of sedimentary diagenesis and regional metamorphism,it is a regional metamorphic deposit.