南天山艾尔宾地区泥盆系沉积环境分析及构造意义

发布时间：2018-07-02 11:55

本文选题：艾尔宾地区 + 泥盆系　；参考：《新疆大学》2017年硕士论文

【摘要】：本文以南天山艾尔宾地区南侧的泥盆系沉积岩为研究对象,在野外调研的基础上,通过室内分析,取得以下成果和认识:将研究区内出露的地层重厘定为三个组,分别为:下泥盆统阿尔皮什麦布拉克组、中泥盆统萨阿尔明组、上泥盆统破城子组,并将其划分八个岩性段。在研究区总体表现为一背斜,中泥盆统位于背斜核部,上泥盆统位于背斜的两翼,两者为整合接触。南侧下泥盆统逆冲在上泥盆统之上。将研究区内的地层划分为一个沉积相,五个沉积亚相。其中下泥盆统第一岩性段为浅海陆棚相过渡带亚相,第二岩性段为浅海陆棚相滨外陆棚亚相,第三岩性段划分为浅海相。中泥盆统第一岩性段为局限台地相,第二岩性段为开阔台地相。上泥盆统破城子组第一段岩性为台地边缘砂相,第二岩性段为碳酸盐岩相中的开阔台地相,第三岩性段为局限台地相。通过沉积相分析,认为研究区的沉积环境在早泥盆世时以海退为主,进入中泥盆世为一次海进,并进入稳定阶段,在晚泥盆世整体表现为一海退趋势,但表现出来的沉积环境复杂多变。结合前人研究成果和研究区沉积环境特征,认为南天山洋盆的俯冲时限应为早奥陶世,闭合时限应为石炭世。并对南天山晚古生代的演化进行了推论。
[Abstract]:This paper takes the Devonian sedimentary rocks in the southern side of the Albin area of the South Tianshan Mountain as the research object. On the basis of field investigation, the following results and understanding are obtained through indoor analysis: three groups are redefined in the study area, which are the Lower Devonian albash mablac formation, the Middle Devonian Salin formation and the upper Devonian break city. The sub group is divided into eight lithologic sections. In the study area, the overall performance is one anticline, the Middle Devonian is located in the nucleus of the anticline, and the upper Devonian is located on the two wings of the anticline. The Lower Devonian in the south is above the upper Devonian. The strata in the study area are divided into a sedimentary facies and five sedimentary subfacies. The Lower Devonian is the Lower Devonian. The one lithologic section is shallow sea shelf facies transition zone subfacies, the second lithologic section is shallow sea shelf facies continental shelf subfacies, and the third lithologic section is divided into shallow marine facies. The first lithologic section of the Middle Devonian is the limited platform facies and the second lithologic section is open platform facies. The first section of the upper Devonian Tuocheng formation is the platform edge sand facies and the second lithologic section is carbonated. The open platform facies in the salt rock phase and the third lithologic section are limited platform facies. Through the analysis of sedimentary facies, the sedimentary environment in the study area is dominated by sea retreat in the early Devonian world, entering the Middle Devonian world as a sea advance, and entering the stable stage. In the late Devonian world, the overall performance is a sea retreat trend, but the sedimentary environment is complex and changeable. The subduction time limit of the South Tianshan oceanic basin should be early Ordovician, and the closed time limit should be Carboniferous, and the evolution of the late Paleozoic in the South Tianshan Mountain is deduced.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P534.44

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