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Permian-Triassic Boundary Characteristics and Conodont Biostratigraphic in Zhebao Region of Nanpanjiang Basin, the Southwestern Margin of Yangtze Plate, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第04期
Page:
479-489
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Permian-Triassic Boundary Characteristics and Conodont Biostratigraphic in Zhebao Region of Nanpanjiang Basin, the Southwestern Margin of Yangtze Plate, China
Author(s):
XIANG Kun-peng HE Yong-zhong AN Ya-yun YI Cheng-xing ZHAO Lei PAN Ying-juan CHEN Ming-hua
(Guizhou Institute of Geological Survey, Guiyang 550081, Guizhou, China)
Keywords:
Permian-Triassic boundary Luolou Formation microbialite conodont biostratigraphy Late Changhsingian paleogeographic evolution Nanpanjiang Basin
PACS:
P531; P535
DOI:
10.19814/j.jese.2020.05028
Abstract:
The growth history of isolated carbonate platform in Nanpanjiang Basin, the southwestern margin of Yangtze plate, ends at the end of Permian, but the restriction of antecedent platform for the sedimentary process in Early Triassic is not yet clear. Permian-Triassic boundary of Zhebao region in the eastern Anran anticline of the northwestern margin of Nanpanjiang Basin was chose as research object, and the conodont biostratigraphy was studied systematically based on the detailed section measurement. The results show that the limestone in the lower part of Luolou Formation contains two conodont zones from the bottom up, including Hindeodus praeparvus zone and Hindeodus parvus zone; compared with several sections in Nanpanjiang Basin, Permian-Triassic boundary can be limited to 1.5 m in layer 4. According to the characteristics of Permain-Triassic boundary section, combined with the regional geological data, the Anran-Zhebao region experiences such a process of slow uplift, partial exposure as island and weathering, and submerging at last during Late Changhsingian. It provides sedimentology evidence for paleogeographic evolution research in Permian-Triassic transition period in Nanpanjiang Basin, South China.

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Last Update: 2020-07-27