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A laminated microbial ecosystem at the summit of the Cambrian Explosion
Global and Planetary Change ( IF 3.9 ) Pub Date : 2021-08-16 , DOI: 10.1016/j.gloplacha.2021.103619
Wei Liu 1, 2 , Chao Chang 1, 3 , Hao Yun 1, 3 , Linhao Cui 1, 3 , Xingliang Zhang 1, 3
Affiliation  

Microbially induced sedimentary structures (MISS) are microbial traces in sandy deposits. They are formed by various modes of microbial behaviour in response to the prevailing physical dynamics in shallow marine environments since the early Archean. The Guojiaba Formation (Cambrian Stage 3), composed of laminated sandstones, siltstones, and mudstones mainly, is characterized by two units of MISS (biolaminite) in the north margin of the Yangtze Block. Biolaminite arises from the microbial growth and it is characterized by alternation of light layers and dark layers in polished slides and the thin sections. The light layers represent the normal background deposition where the development of microbial community is inhibited; whereas, the dark layers are rich in organic materials. SEM identified 7 types of morphologies of microorganisms of a microbenthic community accompanied by a large number of Extracellular Polymeric Substances (EPS) and pyrite framboids from the dark layers. The occurrence of the Biolaminite in the Guojiaba Formation indicates a complex microbial ecosystem within epibenthic microbial mats in a relatively semi-closed to closed sedimentary environment with a high salinity, such as a lagoon, at the summit of the Cambrian Explosion.



中文翻译:

寒武纪大爆发顶峰的层状微生物生态系统

微生物诱导沉积结构 (MISS) 是砂质沉积物中的微生物痕迹。它们是由各种微生物行为模式形成的,以响应自太古宙早期以来浅海海洋环境中普遍存在的物理动力学。郭家坝组(寒武系3期)主要由层状砂岩、粉砂岩和泥岩组成,在扬子地块北缘发育2个MISS(生物层状岩)单元。Biolaminite 由微生物生长产生,其特征是抛光载玻片和薄片中浅层和深色层的交替。浅层代表正常的背景沉积,其中微生物群落的发展受到抑制;而暗层富含有机材料。扫描电镜鉴定了底栖微生物群落的 7 种形态,伴随着大量胞外聚合物 (EPS) 和来自暗层的黄铁矿小枝状体。郭家坝组Biolaminite的出现表明,在寒武纪爆发顶峰的泻湖等相对半封闭至封闭的高盐度沉积环境中,底栖微生物垫内存在复杂的微生物生态系统。

更新日期:2021-08-19
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