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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摘要

对北京西山下苇甸剖面寒武系徐庄组鲕粒灰岩进行了观察和研究,在其中不仅发现了有核及无核同心—放射状鲕、单(或多)晶鲕、泥晶鲕和复合鲕,而且还发现了暗色颗粒包壳、凝聚颗粒和黄铁矿聚集体等特殊组构。暗色颗粒包壳的发现尚属首次,其可能是丝状蓝细菌菌体的残留物。凝聚颗粒由方解石或白云石构成,可能代表了微生物席内的含氧气泡。生物碎屑上的附着体可能是微生物群落的痕迹,在其内部发现有类似鲕粒的球状颗粒。复合鲕胶结松散,包壳不发育,表明其可能形成于相对稳定的水体环境。研究表明,徐庄组鲕粒可能形成于水动力条件相对较弱的浅海环境中,微生物在鲕粒的形成过程中发挥了较大的作用。

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	邢延路
	冯李强

关键词 ：鲕粒, 徐庄组, 微生物, 水动力, 古环境, 北京西山, 下苇甸

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.

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

收稿日期: 2014-04-29 出版日期: 2015-08-01

ZTFLH:

P588.24＋5

基金资助:

教育部大学生创新创业训练计划项目(编号:2012AX0032)资助

作者简介: 邢延路,男,1991年生,中国地质大学(北京)硕士研究生,主要从事矿物学、岩石学和矿床学方面的研究。E-mail: jdbshsj@163.com。

引用本文:

邢延路,冯李强. 北京西山下苇甸剖面寒武系徐庄组鲕粒研究[J]. 古地理学报, 2015, 17(4): 517-528.

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.

链接本文:

http://journal09.magtechjournal.com/gdlxb/CN/10.7605/gdlxb.2015.04.042 或 http://journal09.magtechjournal.com/gdlxb/CN/Y2015/V17/I4/517

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