北京西山下苇甸剖面寒武系徐庄组鲕粒研究

doi:10.7605/gdlxb.2015.04.042

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Abstract

This paper systematically studied the characteristics of oolitic limestone of the Cambrian Xuzhuang Formation at Xiaweidian outcrop in Western Hills of Beijing. Core-beard and core-missed concentric-radial ooids,monocrystalline/polycrystalline ooids,micritic ooids and compound ooids have been found in this study. At the same time,we also found some special textures,such as dark-colored cortices,compounded granules and pyrite agglomerates. Dark-colored cortices are found for the first time,which are probably the remains of filamentous cyanobacteria bodies. Compounded granules,which may represent the oxygen-containing bubbles in microbial mats,are composed of crystals of calcite or dolomite. An attachment is found on the surface of a bioclast and ooid-like particles are found inside the attachment. Compounded ooids,which are loosely compacted and lack of outside cortices,may indicate that they are generated in a relatively quiet shallow water environment. Our research shows that ooids in the Xuzhuang Formation were probably generated in a quiet shallow water environment and microbes played a key role in this process.

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	Articles by authors
	Xing Yanlu
	Feng Liqiang

Key words： ooids Xuzhuang Formation microbe hydrodynamics palaeoenvironment Western Hills of Beijing Xiaweidian

Received: 29 April 2014 Published: 01 August 2015

ZTFLH:

P588.24＋5

About author: Xing Yanlu,born in 1991,is a candidate for master's degree in China University of Geosciences(Beijing). He is mainly engaged in mineralogy,petrology and ore geology. E-mail: jdbshsj@163.com.

Cite this article:

Xing Yanlu,Feng Liqiang. A study on ooids in limestones of the Cambrian Xuzhuang Formation at Xiaweidian outcrop in Western Hill of Beijing[J]. JOPC, 2015, 17(4): 517-528.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2015.04.042 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2015/V17/I4/517

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