巨鲕的微生物成因:来自重庆石柱地区下寒武统的证据

doi:10.7605/gdlxb.2015.02.020

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Abstract

Giant ooids are commonly seen in the Precambrian and Lower Triassic,while they are hardly reported in the Cambrian. Recently,we found giant ooid limestone with about 35 cm thick in the Lower Cambrian Tianheban Formation at the Shiliu section in Shizhu area,Chongqing. The diameter of these giant ooids is generally 5-7mm,with a maximum diameter of 9mm. The giant ooids make up 55％ of rock components. Meanwhile,the recrystallized normal ooids and calcareous shells are relatively common in the limestone. The cements of sparry calcites can be found between the grains. Abundant Cyanobacteria fossils found in the outermost laminae of a giant ooid,form a sort of protruberance-shaped laminae named as “abortive laminae”,with which the microbial cause of giant ooids is clearly revealed. The recrystallized inner dark laminae of giant ooids similarly contain messy girvanell fossils. So it is thought that the active involvement of microorganisms and frequent strong storms are the necessary conditions for the formation of giant ooids.

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	Articles by authors
	Duan Xiong
	Shi Zhiqiang
	Jin Xin
	Fan Hong
	Ji Guofeng

Key words： giant ooid Cyanobacteria Early Cambrian storm microbial cause giant ooid Cyanobacteria Early Cambrian storm microbial cause

Received: 04 March 2014 Published: 01 April 2015

ZTFLH:

P588.24＋5

About author: Duan Xiong,born in 1988,is a master degree candidate in Chengdu University of Technology. Now he majors in sedimentology.
About the corresponding author Shi Zhiqiang,born in 1972, is a professor in Chengdu University of Technology. Now he is engaged in sedimentology. E-mail:Szqcdut@163.com.

Cite this article:

Duan Xiong,Shi Zhiqiang,Jin Xin et al. Microbial cause for giant ooids: Evidence from the Lower Cambrian in Shizhu area,Chongqing[J]. JOPC, 2015, 17(2): 241-248.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2015.02.020 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2015/V17/I2/241

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