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Cambrian oncoids and other microbial-related grains on the North China Platform

Cited 15 time in wos
Cited 17 time in scopus
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Cambrian oncoids and other microbial-related grains on the North China Platform
Other Titles
북중국 대지 캠브리아기 온코이드를 비롯한 미생물 기원 입자들
Zuozhen Han
Hyun Suk Lee
Woo, Jusun
Jitao Chen
Mei Han
Naijie Chi
Xiaolei Zhang
Cambrian; North China Platform; cortex; intraclasts; oncoids; ooids
Issue Date
Zuozhen Han, et al. 2015. "Cambrian oncoids and other microbial-related grains on the North China Platform". CARBONATES AND EVAPORITES, 30(4): 373-386.
This study illustrates features of the Cambrian oncoids and provides a comparison with other microbial-related carbonate grains found in the Cambrian succession of the North China epeiric platform. Based on cortex structures, four types of oncoids were distinguished: thin-cortex (superficial) oncoids, laminated-cortex oncoids, clotted-cortex oncoids, and full-cortex (without nucleus) oncoids. Thin- and clotted-cortex oncoids are often associated with oolites, laminated-cortex oncoids are present within oolitic-bioclastic grainstones, and full-cortex oncoids occur in bioturbated wackestones. The oncoids with nucleus?cortex structures are easily distinguished from other carbonate grains due to the lack of nucleus?cortex structures, and from microbial-related ooids which have more circular shape and more continuous cortex than oncoids. Oncoids without nucleus and with only crudely laminated cortex (i.e., full-cortex oncoids) can be differentiated from microbialite intraclasts and microbial lumps by the following evidences: (1) microbialite intraclasts, either rounded or angular, are characterized by margins that sharply truncate the included calcified microbes or carbonate grains and, in addition, intraclast-bearing conglomerates commonly show clear sedimentary structures such as cross-stratification and normal grading;(2) microbial aggregates have irregular but smooth margins, and rather chaotic inner structures.
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