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- Title
川东南地区下志留统石牛栏组岩相古地理及生物礁滩发育特征.
- Authors
白壮壮; 杨威; 李堃宇; 谢武仁; 马石玉; 计玉冰; 李文正; 王志宏; 武赛军; 黎荣; 苏亦晴
- Abstract
Based on outcrop, core, drilling and logging data, this paper makes a detailed analysis on the lithofacies palaeogeography and biological reef shoal development characteristics of the Lower Silurian Shiniulan Formation in southeastern Sichuan Basin. The results show that: (1) The Shiniulan Formation can be divided into two third-order sequences, with transgressive system tracts developed in the lower part of each sequence and high-order system tracts developed in the upper part. (2) Shiniulan Formation can be divided into delta, limited platform, platform edge shoal, platform edge reef, platform edge ramp and shelf facies. In the sequence frame-work, the lithofacies palaeogeography map is compiled. The platform edge shoals and reef facies are mainly developed in the high system tract of sequences SQ1 and SQ2, and the lithology is mainly reef limestone and bioclastic limestone. (3) Three stages of platform margin reefs and shoals were mainly developed. The first stage was the high system tract of sequence SQ1, the second stage was the lower part of transgressive system tract of sequence SQ2, and the third stage was the upper part of transgressive system tract of sequence SQ2. The second stage was the largest. (4) The development of the reef shoal at the edge of the platform is mainly controlled by the sea level rise and fall and the input of terrigenous clastic materials, and the sea level rise and fall controls the longitudinal development thickness and migration to the edge of the platform. The uplift of the paleo-uplift in central Guizhou makes the coastline migrate northward, which forces the organisms to migrate northward. The terrigenous clastic material provided by the Xuefeng paleo-uplift causes the escape or death of organisms, which limits the development of biological reefs to some extent.
- Subjects
GUIZHOU Sheng (China); SICHUAN Sheng (China); LITHOFACIES; SEA level; AUTUMN; PETROLOGY; FACIES
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 1, p35
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.08.014