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首页> 外文期刊>Journal of Palaeogeography >Microbial mat-related structures shared by both siliciclastic and carbonate formations
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Microbial mat-related structures shared by both siliciclastic and carbonate formations

机译：硅质碎屑岩和碳酸盐岩岩层共有微生物垫相关结构

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Abstract Microbiota has always been the dominant life form, records of which are preserved in delicate forms within siliciclastic rocks. More pronounced record in the form of stromatolites possibly obscured the fact that many of the same delicate structures may be recognizable within carbonate rocks too. The Neoproterozoic Bhander Limestone in central India bears many such structures that are quintessentially similar to microbial mat-related structures reported from the Paleoproterozoic Chorhat Sandstone preserved within the same, Vindhyan Basin. Extensive microscopic, ultramicroscopic, and geochemical studies address the apprehension that such bedding plane structures in carbonate rocks could be merely weathering products. Trapping, binding and stabilitization of sediment by microbial mats are all evident. Preferred pyritization along the inferred, predefined microbial mats confirmed on the basis of {EPMA} (Electron Probe Microanalysis) results, and the enhanced carbon content along these mats layers and within suspected mat chips associated with them, are revealing. Raman spectroscopy, indeed, evinces enhanced kerogen content within both mats and mat chips. Interestingly, these microbial mat layers are recognized selectively within the lower of the two tiers of the Bhander Limestone. The lagoonal carbonate of the lower tier of the Bhander Limestone is muddy and contains a substantial proportion of silt-sized quartz grains that possibly impeded stromatolite growth. Stromatolites abound in the wave agitated upper tier of the Bhander Limestone which is dominated by oosparite. This paper provides evidence that the delicate microbial mat-related structures reported so far only from siliciclastic rocks can also be recognized within carbonate formations, and hopes to stimulate the search for additional such features, more preferably within carbonates originated in shallow and quiet water.
机译：摘要微生物群落一直是主要的生命形式，其记录以微妙的形式保存在硅质碎屑岩中。以叠层石形式出现的更为明显的记录可能掩盖了一个事实，即许多相同的精细结构在碳酸盐岩中也可以被识别。印度中部的新元古代Bhander石灰石具有许多这样的结构，这些结构与从保存在同一Vindhyan盆地的古元古代Chorhat砂岩报道的微生物垫相关结构极为相似。广泛的微观，超微观和地球化学研究解决了这样的担忧，即碳酸盐岩中的这种层理平面结构可能仅仅是风化产物。微生物垫对沉积物的诱捕，结合和稳定作用都是显而易见的。根据{EPMA}（电子探针显微分析）结果确认的，沿推断的，预定的微生物垫进行了优选的黄铁矿化，以及沿这些垫层以及与之相关的可疑垫屑中碳含量的增加。实际上，拉曼光谱证明在垫子和垫子碎片中干酪根含量都增加了。有趣的是，这些微生物垫层在班德石灰石的两层中的较低层中被选择性地识别。班德石灰石下层的泻湖碳酸盐是泥泞的，并且含有很大比例的粉砂大小的石英颗粒，这可能会阻碍叠层石的生长。班德石灰石的上层搅动的上层中充斥着大量的人造石，其中以卵石为主。本文提供的证据表明，到目前为止，仅从硅质碎屑岩中报告的与微生物垫有关的微细结构也可以在碳酸盐岩地层中被识别出来，并希望刺激寻找更多此类特征，更优选地是在源自浅水和安静水域的碳酸盐岩中。

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