Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第12期    总第189期    2014年12月

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文章编号:1004-0609(2014)12-3095-13
天柱大河边重晶石矿床有机地球化学特征及意义
侯东壮1, 2,吴湘滨1, 2,朱怡欢1, 2

(1. 中南大学 有色金属成矿预测教育部重点实验室,长沙 410083;
2. 中南大学 地球科学与信息物理学院,长沙 410083
)

摘 要: 为了研究大河边重晶石矿床中有机质来源和沉积环境,对重晶石矿石及围岩进行有机碳、硫、氯仿沥青“A”及其族组成和饱和烃气相色谱-质谱等测试分析,并对有机质丰度和成熟度等有机地球化学特征进行研究。结果表明:重晶石矿石和围岩中有机质含量和成熟度均较高,表明其经历了类似的地质作用过程;生物标志物指标和图解表明有机质来源以海洋细菌和藻类等低等生物为主,有机质形成于强还原和高盐度的沉积环境。高盐度和碳分布等特征表明有热液参与成矿,矿床盐度分布特征表明海底热液喷口在猪圈湾和大河边附近。

 

关键字: 有机地球化学;大河边重晶石矿床;沉积环境

Organic geochemistry characteristic and significance of Dahebian barite deposit in Tianzhu County, Guizhou Province
HOU Dong-zhuang1, 2, WU Xiang-bin1, 2, ZHU Yi-huan1, 2

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

Abstract:To research the organic matter sources and sedimentary environment in Dahebian barite deposit, barite ore and wall rock were used for the analyses of organic carbon, sulfur, chloroform bitumen “A” and their group composition and saturated hydrocarbons detected by gas chromatography, and the organic geochemistry characteristics involving the organic matter abundance and maturity were discussed. The results show that both the content and grade of maturity of the organic matter are high in barite ore and host rock, which makes it clear that the barite ore and host rock experience similar geological processes. Biomarkers indices and diagrams show that the organic matter is mainly sourced from lower organisms such as marine bacteria and algae, and formed in a sedimentary environment of high reduction and high salinity. The distribution characteristics of high salinity and organic carbon in barite ore and host rock show that hydrotherm is involved in metallogenesis, while the distribution characteristic of the high salinity indicates that the undersea hydrothermal vents exist near Zhujuanwan and Dahebian in Tianzhu County.

 

Key words: organic geochemical; Dahebian barite deposit; sedimentary environment

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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