山东省莱阳市牛百口地区石墨矿地质特征及碳质来源分析  

Geological Characteristics and Carbon Sources Analysis in Graphite Deposit of Niubaikou area in Laiyang City in Shandong Province

作　　者：王群 宫本涛 WANG Qun;GONG Bentao(No.4 Exploration Institute of Geology and Mineral Resources,Shandong Weifang 261021,China)

机构地区：[1]山东省第四地质矿产勘查院,山东潍坊261021

出　　处：《山东国土资源》2024年第4期11-18,共8页Shandong Land and Resources

基　　金：山东省国土资源厅,山东省莱阳市牛百口地区石墨矿普查,项目编号:鲁勘字[2015]21号。

摘　　要：山东省是我国重要的石墨矿成矿区,晶质石墨主要成因类型为区域变质型,产于古元古代荆山群陡崖组徐村段中。牛百口矿区与西徐格庄、大梁子口、山前夼、吕格庄等石墨矿均产于荆山群陡崖组,具有明显的层位控制,且具有一定的连续性,沿荆山背斜呈NE向发育,矿体规模整体较大,具有较好的找矿远景。通过对胶东地区荆山群中石墨矿的碳同位素数据汇总分析,认为石墨的碳质来源为有机质的原生沉积,区域变质作用导致大理岩中石墨与碳酸盐发生碳同位素交换,含碳流体混合岩化作用导致片麻岩中石墨与流体发生同位素交换,碳同位素分馏作用导致石墨δ^(13)C值偏轻,无机碳δ^(13)C值偏重,分馏过程未发生化学变化。因此,胶东地区荆山群石墨矿的碳质来源应为有机质,同类型的牛百口矿区石墨矿碳质来源应为有机质。Shandong province is an important graphite deposit area in China.Main genetic type of crystalline graphite is regional metamorphism.It occurs in Xucun section of the steep cliff formation of Jingshan group in Paleoproterozoic era.From a regional perspective,graphite deposits in Niubaikou mining area,Xixugezhuang,Daliangzikou,Shanqian Kuang and Lugezhuang all occur in the steep cliff formation of Jingshan group with obvious stratigraphic control and certain continuity.They develop in a northeast direction along Jingshan anticline,and the overall scale of the ore body is relatively large with good prospecting prospects.Through summary and analysis of carbon isotope data of graphite deposits in Jingshan group in Jiaodong area,it is believed that the carbon source of graphite is the primary deposition of organic matter.Regional metamorphism leads to carbon isotope exchange between graphite and carbonate in marble,mixed diagenesis of carbon containing fluids leads to isotope exchange between graphite and fluids in gneiss,and carbon isotope fractionation leads to graphite isotope exchangeδ13 C value is relatively light,while theδ13 C value of inorganic carbon is biased.There is no chemical change during the distillation process.Therefore,the carbon source of graphite deposits of Jingshan group in Jiaodong area should be organic matter,while the carbon source of graphite deposits in the same type of Niubaikou mining area should be organic matter.

关 键 词：石墨矿 荆山群 地质特征 碳质来源 碳同位素分馏 有机质 莱阳市牛百口 山东省 

分 类 号：TD985[矿业工程—选矿]