云南金顶铅锌矿床中有机质的生物标志化合物特征及其意义

云南金顶铅锌矿床中有机质的生物标志化合物特征研究表明:正构烷烃碳数分布范围较宽,有两种峰型,具弱奇偶优势;萜烷化合物相对丰度五环三萜烷三环萜烷四环萜烷;甾烷以规则甾烷为主,规则甾烷C27-C28-C29呈不对称"V"字型分布;有机质的母质来源以低等水生生源的海藻类为主,伴随有一定量的陆源高等植物组分;有机质沉积于弱氧化-弱还原低盐度环境,其成熟度较高;样品均遭受了一定程度的热解,这可能与成矿热液的热力作用有关,部分样品还遭受了生物降解作用,砂岩型矿石共生有机质的成熟度略高于角砾状矿石赋存的有机质;生物标志化合物多参数对比表明有机质来源于三叠系三合洞组碳酸盐岩地层。

CHARACTERISTICS OF BIOMARKER COMPOUNDS AND ITS IMPLICATION IN JINDING LEAD-ZINC DEPOSIT, YUNNAN, CHINA

Analyzing on the extracted soluble organic and biomarkers of rocks and ores of Jinding lead- zinc deposit shows that n-alkanes is distributed in a relatively wide range with two peaks. Abundance order is pentacyclic triterpane 〉tricyclic terpane 〉quartcyclic terpane. The carbon number distribution of the steranes shows a slight predominance of C28 ,a indication of the organic matter derivation of marine al ga incorpreated with a certain amount of terrigenous high grade plants. The organic matter was deposited under weak oxidation-weak reduction and low salinity environment with high maturity. All samples show exposition to pyrolysis that may related to heating of hydrothermal ore fluid and some biodegradation. The maturity of absorbed organic matter of sandstone type ore is slightly higher than the breccia type ores. Multi-parameter comparison of biomarkers reveals that the organic matter in the deposit came from Triassic carbonate rocks.