The study area is located in the southern section of Liao-Lu-Wan Fault Depression Zone on the North China Craton which is characterized by thick Neoproterozoic Qingbaikou system with wide distribution. The Neoproterozoic Qingbaikou system in Huainan area outcrop relatively complete with strongly successive sedimentary sequence, the geotectonic background is passive continental margin and the sedimentary environment is Shore-shallow sea environment with the seawater from north to south gradually deepened. The formations from below to the top are: Liulaobei Formation, Shouxian Formation, Jiuliqiao Formation, Sidingshan Formation. Based on the detailed measurement and description of the geological section in the field, the characteristics and the evolution of the sedimentary facies in the research area are studied by the comprehensive study of the lithology, structure, tectonic and its combination characteristics, and we also combinated with slice analysis. Study shows: The major sediment of Liulaobei Formation is purplish red-celadon marl, gray shale brow brown-yellow dolomite; Horizontal bedding can be found in Liulaobei Formation, and it is supratidal zone and neritic shelf depositional environment. The depositional environment in lower part of the Shouxian formation is foreshore but upper part is shore face and the major sediment is fine sandstone, siltstone and shale. The seawater gradually became shallow and clear from then on, thus the overlying stratas are carbonate tidal flat deposit and the major sediment is mud-sized crystalline dolostone, crystal powder dolomite, argillaceous dolomite and so on; Stromatolite reef and local siliceous bands and storm rocks can be found in Jiuliqiao Formation, which is subtidal zone depositional environment. Horizontal laminated bed can be found but stromatolite and chert is rare in Sidingshan Formation that is intertidal-supralittoral zone depositional environment. Comprehensive analysis shows that the seawater of Neoproterozoic Qingbaikou system in study area experienced two shallow-deep-shallow cycles, and the main facies are Carbonate platform-shallow sea shelf-barrier-coast-carbonate platform. We also established the microcycle superposition model of barrierless coast and carbonate platform according to that.
类型: 国际会议
作者: GUAN Yulong,LUO Shunshe,WANG Tongshan,LYU Qiqi,ZHANG Yan,ZHOU Qingan
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学
专业: 地质学
单位: School of Geosciences, Yangtze UniversityHubei Cooperative Innovation Center of Unconventional Oil and GasLaboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education, Yangtze UniversityResearch Institute of Petroleum Exploration & Development
分类号: P534.3
DOI: 10.26914/c.cnkihy.2019.028427
页码: 265-266
总页数: 2
文件大小: 115k
下载量: 1
本文来源: https://www.lunwen90.cn/article/b3d8588300ad265fc2b07ffe.html