1. 广西浪平地区黄龙组底部的核形石及其意义.
- Author
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黄文韬, 巩恩普, 张永利, and 苗卓伟
- Subjects
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SEA level , *PETROLOGY , *LIMESTONE , *SEDIMENTOLOGY , *ALGAE , *PALEONTOLOGY - Abstract
The Carboniferous strata completely outcrops in Langping area, Guangxi. Oncoid-bioclastic limestone develops at the base of Huanglong Formation. To reveal the depositional environment and geological significance of the oncoids, the studies relating to paleontology, sedimentology, and petrography were carried out. The fusulinids in oncoid-bioclastic limestone establish an earliest Moscovian age, which corresponds to Profusulinella aljutovica-Taitzehoella taitzehoensis externa subzone in South China. Four oncoid types have been recognized; micrile oncoid, debris envelope oncoid, algae envelope oncoid, and composite oncoid. Four microfacies types have been identified; MF1, MF2, MF3, and MF4. In the earliest Moscovian, the sea level started to rise, which changed the depositional environment, providing the basis for microbial activity and high water energy for the formation of oncoids in the study area. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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