四川北川甘溪地区下泥盆统风暴沉积研究及其地质意义
[Abstract]:Based on the field storm sedimentary profile of the lower Devonian Ganxi section in Ganxi, Beichuan, Sichuan Province, this paper studies the structure and sedimentary evolution of the field profile of Ganxi formation, Xie Jiawan formation and Yangmaba formation, and then establishes the Ganxi formation. The formation of storm rock and its geological significance are preliminarily discussed by combining the storm sedimentary sequence and distribution model of the Xiejiawan and Yangmaba formations with the microscopic analysis of the thin section of the storm rock cast. Storm deposits are widely developed in the lower Devonian Ganxi formation, Xie Jiawan formation and Yangmaba formation in Beichuan, Ganxi Basin, and Yangmaba formation, with vertical superposition of multi-stage storm deposition, obvious storm deposition characteristics, erosion surface, canal model structure, biological crust retention deposition, parallel stratification, etc. There are 7 types of storm sedimentary sequence types and 3 types of storm sedimentary types: near source sand storm deposition, near source mixed storm deposition and distant source sand storm deposition, among which, 7 types of storm sedimentary sequence and 3 types of storm sedimentary types are developed. Near source sandstorm deposits were developed in the lower member of Ganxi formation and Xijiawan formation, near source mixed storm deposition in upper part of the upper member of Xie Jiawan formation and Yangmaba formation, and distant sandstorm deposit in lower part of upper member of Xie Jia Wan formation. The typical storm sequence is composed of erosion surface and channel model (Sa), biologic shell retention section (Sb), parallel bedding segment (Sc), mound staggered bedding segment (Sd) and mudstone segment (Se). The storm lithology of the lower Devonian Ganxi formation, Xiejiawan formation and Yangmaba formation in Beichuan Ganxi Basin are mainly composed of siltstone, argillaceous siltstone, shredded siltstone and sandy shredded limestone. The particle separation and grinding round is better, indicating that the storm has a constructive effect on its transformation. The geological significance of storm sedimentary research includes isochronous, paleolatitude and paleogeographic significance. It is determined that the lower Devonian strata of Ganxi area were located in the low latitude of tropical subtropics at that time, and the sedimentary environment was shallow sea shelf.
【学位授予单位】:成都理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:P512.2
【参考文献】
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