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地质论评  2012 

中元古代微指状叠层石:超微组构和有机矿化过程

Keywords: 微指状叠层石,微组构,微生物矿化,中元古代,华北地台

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Abstract:

微指状叠层石(microdigitatestromatolites,以下简称MDS)是新太古代―中元古代一种重要的沉积构造。由于其内部以纤维状组构为重要特征,而缺乏直接的微生物化石证据,被认为代表特定海洋化学条件下形成的一种海底碳酸盐沉淀,属无机成因。本文对华北中元古代雾迷山组硅化MDS的显微组构研究发现,其柱体由亚毫米级浅色微亮晶纹层(平均厚约65μm)和暗色微晶纹层(平均厚约680μm)交互叠加而成。前者含较少细菌残余,重结晶显著;后者富含细菌残余、微晶多面体及微球粒,并进一步分为具密集连续次级微纹层的(平均厚约380μm)和具稀疏断续微纹层的(平均厚约300μm)两种暗纹层。这三种纹层在纵向上的规律性交互可能反映了季节性变化。毛发状垂向纤维贯穿于整个柱体,但在亮纹层内稀疏。这种纤维可能由垂向生长的丝状菌束(宽<10μm)矿化而成,有些由微球粒(粒径为10~30μm)定向富集构成。微球粒富含细菌残余、胞外聚合物(EPS)以及与之密切共生的纳米颗粒(粒径<45nm)。纳米颗粒可粘结形成亚μm级多面体,构成碳酸盐晶体生长的基点。包围微球粒的微亮晶环边和纤维组构间的微亮晶条带内少细菌残余,可能属微生物影响的矿化成因,而纤维体和微球粒则是微生物诱发矿化的结果。故中元古代MDS属微生物成因,它所展现的有机矿化过程可能也适用于更古老的叠层石。此外,MDS内有机矿物从纳米颗粒到微球粒的有序聚合可能代表了有机矿化的普遍过程,并可用作判定微生物成因碳酸盐岩的重要标识。

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