西秦岭拉尔玛金矿热水硅质岩中的分子古生物学研究

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拉尔玛金矿热水成因硅质岩中的分子古生物学研究表明:其正烷烃以碳数分布于C16~C36、主峰碳为C29为特征;除此,还鉴定出规则类异戊二烯和胡萝卜烷系列化合物、烷基环己烷系列、长链三环萜烷、五环三萜烷、甾类分子化石和烷基噻吩系列化合物、烷基四氢噻吩系列化合物、二苯并噻吩、甲基二苯并噻吩等含硫芳烃以及菲及其同系物等非含硫芳烃分子化石.氯仿沥青“A”族组成Q型聚类分析表明拉尔玛金矿硅质岩与现代蓝绿藻和绿藻生物样品聚为一类,并且在增加有机硫这个参数的条件下,拉尔玛金矿硅质岩与现代陆上热泉和海底热水沉积物归为一类,这不仅说明拉尔玛金矿硅质岩的生物先体为海生低等菌藻生物,而且,有机质及分子化石是反映沉积古环境的有利指标. The paleontological study of the hydrothermal origin of the Lalma gold deposit in the cherts shows that the n-alkanes are characterized by their carbon number distributions at C16-C36 and the main peak carbon at C29. In addition, regular isoprenoids And carotenoid series compounds, alkylcyclohexane series, long-chain tricyclic terpanes, pentacyclic triterpanes, steroid molecular fossils and alkylthiophene series compounds, alkyltetrahydrothiophene series compounds, dibenzothiophene, Sulfur-containing aromatic hydrocarbons such as methyl dibenzothiophene and non-sulfur-containing aromatic hydrocarbon fossils such as phenanthrene and its homologs. Q-type cluster analysis of “A” trace elements of chloroform bitumen showed that the Lalma gold-bearing chert is clustered with modern blue-green algae and green algae biological samples, and under the condition of increasing organic sulfur, The gold-bearing cherts and the modern terrestrial hot springs and seafloor hydrothermal sediments fall into one category. This not only shows that the biological precursors of the cherts in the Lalma gold mine are low-grade marine algal biomass, but also organic matter and Molecular fossils reflect the ancient paleoenvironmental favorable indicators.
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