摘要
用有机地球化学方法对矿区与右江盆地有机质的分析研究表明，容矿的大厂层有机碳与锑含量相对较高；有机包裹体主要是气态烃包裹体与沥青包裹体，在气态烃包裹体中含0％～30％的液态烃，发暗黄色荧光；有机气相成分中四种烷烃甲烷、乙烷、丙烷、丁烷均有显示；从主成矿期萤石中的沥青及右江盆地再沉积火山碎屑岩中的干酪根的生物标志物测定结果来看，二者在正烷烃、类异戊二烯烷烃、萜烷与甾烷标志物特征上较为接近，表明右江盆地沉积物中的有机质与锑矿中的有机质有亲缘关系。模拟实验证明原油对锑有较强的萃取迁移能力；而有机质在锑成矿过程中主要起三方面的作用：淋滤、萃取迁移及还原沉淀。
Organic matter in the mining district and the Youjiang Basin has been examined by or-ganic geochemistry. It shows that the ore-hosted bed──the Dachang bed in the mining district hasa relatively high content of organic carbon and Sb. Organic inclusions are mainly gaseous hydrocar-bon and bitumen inclusions. There are some liquid hydrocarbons which account for O%～30% ofgaseous hydrocarbon inclusions and give off dark yellow fluorescence. There appear four alkanessuch as CH4,C2H6,C3H8,C4H10, in gaseous hydrocarhon phase according to compositional analysis oforganic gases. Biomarker identification was made of bitumen from fluorite crystallized at the mainstage of ore deposition and kerogen from re-sedimentary pyroclastic rocks in the Youjiang Basin.The results indicate that they are close to each other with respect to their biomarkers such as nor-mal alkane, isoprenoid alkane, terpane and sterane, indicating an affinity hetween organic matter inthe sediments of the Youjiang Basin and that in the antimony ores. Simulating experiments showedthat liquid hydrocarbons have a strong capability of extracting and transporting the metal. Themain role of organic matter in the mineralization of Sb can be described in three aspects:leaching -extraction,extraction-migration and reduction-precipitation.
出处
《矿物学报》
CAS
CSCD
北大核心
1997年第3期310-315,共6页
Acta Mineralogica Sinica
基金
中国科学院矿床地球化学开放研究实验室资助
关键词
锑矿床
有机质
成矿作用
有机包裹体
organic matter
organic geochemistry
simulating experiment
mineralization
