| 硅质碎屑岩中的微生物席相关构造——联接现代与过去的纽带 |
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| 引用本文： | 郭荣涛.硅质碎屑岩中的微生物席相关构造——联接现代与过去的纽带[J].地球科学进展,2013,28(4):467-476. |
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| 作者姓名： | 郭荣涛 |
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| 作者单位： | 中国地质大学(北京)地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金项目"燕山地区蓟县系旋回与事件及其相关沉积学问题研究" |
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| 摘 要： | 微生物通过自身生命活动可以在硅质碎屑物上形成微生物席.微生物席具有黏结性、柔韧性、抗剥蚀性等特征,与物理营力相互作用可以形成一系列独特的原生沉积构造,即微生物诱发的沉积构造(MISS).形成和保存MISS的基本条件包括经历较低的变质程度、发育于海退—海侵的转折点、出现在有利的“微生物席沉积相”中.微生物席本身很难保存在岩石序列中,所以识别石化MISS具有一定难度.与现代环境中发育的MISS具有相似的几何形态和包含古代微生物席组构是识别石化MISS的有效途径.微生物生长、稳化、障积、捕获和黏结作用可以形成形态各异的MISS,根据这些作用和特征可以将其划分为5大类17小类.对保存在硅质碎屑岩中的微生物诱发的原生沉积构造和现代潮坪中发育的MISS进行综合对比研究,有利于微生物席沉积学的发展,也为进一步理解古代硅质碎屑岩沉积环境提供重要线索.
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| 关 键 词： | MISS 微生物席 原生沉积构造 沉积学 |
The Mat Related Structures Preserved within Siliciclastic Rock Record: The Connection of Now and Past |
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| Guo Rongtao.The Mat Related Structures Preserved within Siliciclastic Rock Record: The Connection of Now and Past[J].Advance in Earth Sciences,2013,28(4):467-476. |
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| Authors: | Guo Rongtao |
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| Institution: | School of Earth Sciences and Resource, China University of Geosciences, Beijing100083, China |
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| Abstract: | Microbial community can form microbial mat on siliciclastic sediments. For the soft, adhesive and erosion-resistant features of mat, under the impact of physical sediment dynamics, the siliciclastic sediments covered by mat can form a series of special primary sedimentary structures, which are called as “Microbially Induced Sedimentary Structures (MISS)” by Noffke. The basic conditions of forming and preserving MISS, include experiencing lower metamorphic grade, correlating with turning point of regression-transgression, and occurring in favorable “microbial mat depositional facies”. As microbial mat can hardly preserve down in rock sequences, the recognition of fossil MISS is difficult. Similar geometry to the modern counterparts and including microtextures related to ancient mat, are effective ways to recognize fossil MISS. Microbial growth, biostabilization, baffling, trapping and binding can form many different types of MISS. According to these processions and their characteristics, MISS can be divided into five classes and 17 subclasses. The comparative study of fossil MISS preserved within siliciclastic rock record and their modern counterparts, can not only promote the development of microbial mat sedimentology, but also provide important clues for further understanding of the ancient siliciclastic sedimentary environment. |
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| Keywords: | MISS Microbial mat Primary sedimentary structures Sedimentology |
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