A variety of microbial mat induced sedimentary structures (MISS) occur in the basal part of the Mesoproterozoic Rohtas Limestone and the Bhander Limestone, India. The combined outcrop and petrographic studies establish unicellular microbial origin of the MISS in the Rohtas Limestone and the Bhander Limestone. Micro-scale deformations associated with MISS imply the late cementation. Paradoxically MISS, once formed, has a better preservation potential in carbonate sediments because of their proneness to get cemented early. The studied basal sections of both the formations built up in a low energy depositional condition. In warm and arid tropical climate, high concentration of dissolved inorganic carbon exacerbated precipitation of aragonite crystals in successive stacks and sulfur concentration led to gypsum precipitation. However, the temperature in the palaeodepositional environment could have been high enough to restrict the sulfur reduction rate severely hampering the growth of sulphur reducing bacteria (SRB) population which was the most powerful post-Archaean calcification engine. The available results indicate Mesoproterozoic palaeotemperature raised up to 32°C at a mid-latitude location. In the Vindhyan sea straddling across the equator, temperature is predicted to have been considerably higher. The ancient marine limestone formations having MISS, irrespective of their age, developed in similar low palaeolatitudinal locations. Thus, it is reasonable to attribute that high temperature at depositional site cards carbonate sediments to acquire MISS by delayed cementation. Early cementation hinders MISS formation in carbonate sediments, till the sea water temperature crosses an optimal value.

中文翻译：

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碳酸盐岩中微生物垫诱发的沉积结构（MISS）的意义：印度元古代Rohtas石灰石和Bhander石灰石的见解

在印度中元古生代Rohtas石灰石和Bhander石灰石的基部，发生了多种微生物垫诱发的沉积结构（MISS）。露头和岩相学的联合研究确定了Rohtas石灰石和Bhander石灰石中MISS的单细胞微生物起源。与MISS有关的微观形变暗示了晚期胶结作用。自相矛盾的是，MISS形成后，由于碳酸盐沉积物易于早期固结，因此在碳酸盐沉积物中具有更好的保存潜力。研究的两个地层的基础剖面都是在低能量沉积条件下建立的。在温暖和干旱的热带气候中，高浓度的溶解性无机碳加剧了连续堆中文石晶体的沉淀，而硫的浓度导致了石膏的沉淀。然而，古沉积环境中的温度可能已经高到足以限制硫的还原速率，从而严重阻碍了硫离子还原菌（SRB）种群的增长，这是在Archaean后最强大的钙化引擎。可获得的结果表明中纬度地区的中元古生代温度上升到32°C。在横跨赤道的Vindhyan海中，温度预计会大大提高。无论年龄如何，具有MISS的古代海洋石灰岩地层都在相似的古近纬位置发育。因此，可以合理地认为，沉积位点的高温会使碳酸盐沉积物通过延迟胶结作用而获得MISS。早期的胶结作用阻碍了碳酸盐沉积物中MISS的形成，