Organic geochemistry and comparisons of characteristics of the organic matter in wall rocks of the ore\|controlling strata and ores of the Lower Jurassic Songling black shale formation and the related Songxi silver\|a...Organic geochemistry and comparisons of characteristics of the organic matter in wall rocks of the ore\|controlling strata and ores of the Lower Jurassic Songling black shale formation and the related Songxi silver\|antimony deposit of northeastern Guangdong have been studied in this paper. The results show that the Lower Jurassic Songling shale formation is a suite of biologic\|rich and organic\|rich ore\|bearing marine sedimentary rocks. Micro\|components of the organic matter in the Songling black shale formation consists primarily of algae, amorphous marine kerogen, solid bitumen, and pyrobitumen. The thermal evolution of organic matter is at the over\|maturity stage. There is a general positive correlation between total organic carbon (TOC) and metallogenetic elements such as Ag and Sb in the black shale formation. Organic matter in the host rocks in the Songxi ore deposit played a role in controlling the silver\|antimony depositing environment during the forming process of the black shale ore\|bearing formation. In the absence of vitrinite, the relative level of thermal maturity calculated by solid bitumen reflectance indicates that the ore\|forming temperature of the Songxi silver\|antimony deposit was about 150-170℃, which was considered as an epithermally reworked ore deposit. The roles of organic matter in the formation of the Songxi ore deposit are a primitive accumulation of the metallogenetic elements (Ag, Sb) in the sea\|water cycle system for ore source and a concentration of metals by ion exchange or chelation as well as reduction of the oxidized metals.展开更多
粤东宝山大型银(锑)矿床产于早侏罗世火山-沉积地层中,银、硫(锑)化物矿体呈脉状,沿下侏罗统金鸡组上段碳质页岩和粉砂岩的层间断裂中分布。矿床深部其青磐岩化蚀变,中部以黄铁矿化、硅化、碳酸盐化为主,上部以硅化为特征。矿区自西向...粤东宝山大型银(锑)矿床产于早侏罗世火山-沉积地层中,银、硫(锑)化物矿体呈脉状,沿下侏罗统金鸡组上段碳质页岩和粉砂岩的层间断裂中分布。矿床深部其青磐岩化蚀变,中部以黄铁矿化、硅化、碳酸盐化为主,上部以硅化为特征。矿区自西向东锑矿化减弱,银矿化增强,在垂直方向上,60 m 标高之上为锑矿化富集带,0m 标高以下为银矿化富集带。研究表明,区域早侏罗世火山-沉积地层可能是矿源层,矿床是与燕山中—晚期火山-次火山活动有关的浅成中-低温热液矿床。展开更多
基金ThisprojectwasjointlysupportedbytheNationalNaturalScienceFoundationofChina! (No :49872 0 37) theDoctoralProgramFoundationfor
文摘Organic geochemistry and comparisons of characteristics of the organic matter in wall rocks of the ore\|controlling strata and ores of the Lower Jurassic Songling black shale formation and the related Songxi silver\|antimony deposit of northeastern Guangdong have been studied in this paper. The results show that the Lower Jurassic Songling shale formation is a suite of biologic\|rich and organic\|rich ore\|bearing marine sedimentary rocks. Micro\|components of the organic matter in the Songling black shale formation consists primarily of algae, amorphous marine kerogen, solid bitumen, and pyrobitumen. The thermal evolution of organic matter is at the over\|maturity stage. There is a general positive correlation between total organic carbon (TOC) and metallogenetic elements such as Ag and Sb in the black shale formation. Organic matter in the host rocks in the Songxi ore deposit played a role in controlling the silver\|antimony depositing environment during the forming process of the black shale ore\|bearing formation. In the absence of vitrinite, the relative level of thermal maturity calculated by solid bitumen reflectance indicates that the ore\|forming temperature of the Songxi silver\|antimony deposit was about 150-170℃, which was considered as an epithermally reworked ore deposit. The roles of organic matter in the formation of the Songxi ore deposit are a primitive accumulation of the metallogenetic elements (Ag, Sb) in the sea\|water cycle system for ore source and a concentration of metals by ion exchange or chelation as well as reduction of the oxidized metals.
文摘粤东宝山大型银(锑)矿床产于早侏罗世火山-沉积地层中,银、硫(锑)化物矿体呈脉状,沿下侏罗统金鸡组上段碳质页岩和粉砂岩的层间断裂中分布。矿床深部其青磐岩化蚀变,中部以黄铁矿化、硅化、碳酸盐化为主,上部以硅化为特征。矿区自西向东锑矿化减弱,银矿化增强,在垂直方向上,60 m 标高之上为锑矿化富集带,0m 标高以下为银矿化富集带。研究表明,区域早侏罗世火山-沉积地层可能是矿源层,矿床是与燕山中—晚期火山-次火山活动有关的浅成中-低温热液矿床。
