微生物活动的沉积响应:以MT构造为例

Sedimentary Response of Microbial Activities:A Case Study from MT Structures

数十亿的地球演化历史中,作为"生物界的巨人"的微生物占据着重要地位,在其蓬勃发展的中新元古代时期,在沉积岩中留下了许多不可磨灭的印迹。本文主要介绍了仅发育在前寒武纪沉积地层中的MT构造,综述了其研究历程和国内外最新研究进展,根据其在岩石中呈现形式的一定规律性,将MT构造划成5种类型;总结了前人对MT构造成因的研究成果,发现MT构造与微生物有着紧密联系。基于微生物活动在沉积物的沉积和成岩作用中扮演着极其重要的角色,促使了"微生物沉积学"的产生和发展,成为探索地球早期环境变化和生命起源演化的一个窗口。

During evolvement history of the Earth in billions of years, microorganism as the giant of living nature occupied an important position in this time and had a flourishing period in Meso-Neoproterozoic, leaving an indelible mark in the sedimentary rocks. Based on a large amount of information from the latest papers and works on MT structures,combined with the field work of the authors, this paper mainly presents its development only in Precambrian sedimentary strata,analyzes and summarizes the definition, classifications,development conditions and existing states. With an overview of the previous research results, the paper has proposed the classification scheme of MT structures, dividing them into 5 types. By comparing the shapes of MT structures, they are closely linked with microorganism, causing significant correlation of the renderings in the rocks. Sedimentation and diagenesis of the original components of sediments are mainly affected by microbial activities,inspiring the emergence and development of microbial sedimentology,as a window to explore the early changes of earth＇s environment and the origin and evolution of life.