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首页> 外文期刊>Open Geosciences >Calcified microorganisms bloom in Furongian of the North China Platform: Evidence from Microbialitic-Bioherm in Qijiayu Section, Hebei
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Calcified microorganisms bloom in Furongian of the North China Platform: Evidence from Microbialitic-Bioherm in Qijiayu Section, Hebei

机译：华北平台芙蓉岩中的钙化微生物大量开花：河北省齐家yu地区微生物-生物群落的证据

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摘要

In order to study the sedimentological response of the first episode of “cyanobacteria calcification event” in Phanerozoic, we studied the microbialites from Furongian Series in Qijiayu section, Hebei Province, which is located in the central part of the North China Platform. Cambrian Furongian Series is made up of three third-order depositional sequences, Depositional Sequence 1 (DS_(1)) in Changshan Formation and DS_(2) and DS_(3) in Fengshan Formation. Two beds of massive limestone of a shallow ramp facies developed in Changshan Formation and the first third-order sequence of Fengshan Formation. Both of them contains many dome-shaped carbonate structures that formed as a result of forced regression. These structures can be described as leiolitic bioherms, with a morphology like string of beads. In the current study, microorganisms such as Epiphyton , Girvanella and Renalcis are reported from the leiolitic bioherms. This provides not only documentation for the model of cyanobacteria calcification, but also describes the genesis of leiolitic bioherms by microbial processes inside cyanobacteria dominated microbial mats. Moreover, the diverse emergence of the calcified microorganisms represents the fossil evidence of calcified microorganisms’ blooms in Cambrian Furongian and offers a reference for studying the complex microbial processes in such old carbonate depositions.
机译：为了研究古生代第一轮“蓝藻钙化事件”的沉积学响应，我们研究了位于华北台中部的河北省齐家jia地区芙蓉岩系列的微生物。寒武纪芙蓉岩系列由三个三阶沉积层序组成：长山组的沉积层序1（DS_（1））和凤山组的DS_（2）和DS_（3）。长山组和凤山组第一三阶层序发育了两块浅斜坡相块状灰岩。它们都包含许多由于强制回归而形成的圆顶形碳酸盐结构。这些结构可被描述为亮质生物质，形态类似于珠串。在当前的研究中，据报道，来自leoliolitic生物herms的微生物如附生菌，Girvanella和Renacis。这不仅提供了蓝细菌钙化模型的文献，而且还描​​述了通过蓝细菌为主的微生物垫内部的微生物过程而产生的油质生物herms的起源。此外，钙化微生物的多样化出现代表了寒武纪芙蓉岩中钙化微生物大量繁殖的化石证据，并为研究此类老碳酸盐沉积物中复杂的微生物过程提供了参考。

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