| Minerogenetic Mechanism of the Songxi Silver—Antimony Deposit of Northeastern Guangdong—Ore—Controlling Role of Organic Matter |
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| 引用本文： | 胡凯,肖振宇,等.Minerogenetic Mechanism of the Songxi Silver—Antimony Deposit of Northeastern Guangdong—Ore—Controlling Role of Organic Matter[J].中国地球化学学报,1999,18(4):305-313. |
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| 作者姓名： | 胡凯 肖振宇 |
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| 作者单位： | StateKeyLaboratoryofMineralDepositResearch,DepartmentofEarthSciences,NanjingUniversity,Nanjing210093, |
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| 摘 要： | 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 bitument,and pyrobitument.The thermal evolution of organic matter is at the over-maturity stage.There is a general positive correlation between total organic carbon(CO)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 bitument reflectance indicates that the ore-forming temperatute 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 Sonxi 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 of chelation as well as reductionn of the oxidzed metals.
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| 关 键 词： | 银锑矿床 有机物 总有机碳 TOC 沉积岩 有机地球化学 |
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