Oncoids and Its Significance from the Base of Huanglong Formation in Langping， Guangxi

doi:10.12068/j.issn.1005-3026.2019.11.016

Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (11): 1606-1610.DOI: 10.12068/j.issn.1005-3026.2019.11.016

• Resources & Civil Engineering • Previous Articles Next Articles

Oncoids and Its Significance from the Base of Huanglong Formation in Langping， Guangxi

HUANG Wen-tao， GONG En-pu， ZHANG Yong-li， MIAO Zhuo-wei

School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Received:2018-09-18 Revised:2018-09-18 Online:2019-11-15 Published:2019-11-05
Contact: GONG En-pu
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Abstract

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 extensa subzone in South China. Four oncoid types have been recognized: micrite 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.

Key words: Langping, Huanglong Formation, oncoids, sea-level change, Moscovianage, bioclastic limestone

CLC Number:

P588.2

HUANG Wen-tao， GONG En-pu， ZHANG Yong-li， MIAO Zhuo-wei. Oncoids and Its Significance from the Base of Huanglong Formation in Langping， Guangxi[J]. Journal of Northeastern University Natural Science, 2019, 40(11): 1606-1610.

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Oncoids and Its Significance from the Base of Huanglong Formation in Langping， Guangxi

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