【作者】 张雷；

【导师】 李永军；

【作者基本信息】 长安大学 ， 工程硕士 地质工程（专业学位）， 2021， 硕士

【摘要】 新疆巴里坤县大红柳一带位于卡拉麦里-塔克扎勒断裂南侧,地处东准噶尔造山带、博格达晚古生代裂谷带和哈尔里克古生代造山带三大构造带的结合部位,是研究准噶尔盆地基底的典型地区之一。本文以研究区内晚石炭世-早二叠世地层为研究对象,详细探讨了其岩石组合、岩性岩相、火山岩喷发、岩石地球化学、构造环境、时代归属等特征,为进一步认识东准噶尔地区晚古生代构造演化过程提供了依据。本次在充分收集、研究前人资料的基础上,进行详尽的野外地质调查和同位素年代学、岩石地球化学研究,获得以下主要认识:1.对研究区地层有了进一步认识。于原划下石炭统亚曼苏组上亚组中分别获得锆石U-Pb年龄(318.9±2.6)Ma,(279.1±1.5)Ma;根据年代学、地层学、岩石学特征将该组解体,重新厘定为上石炭统巴塔玛依内山组、石钱滩组、六棵树组、下二叠统卡拉岗组,并在新划巴塔玛依内山组中首次识别出古火山口。重新厘定上石炭统石钱滩组与下伏巴塔玛依内山组为角度不整合,下二叠统卡拉岗组与下伏六棵树组为喷发不整合,查明了多个区域性构造界面。2.探讨了研究区晚石炭世-早二叠世沉积环境、构造背景、演化过程。于本次新划巴塔玛依内山组内发现大量的A型(碱性)流纹岩,岩石类型有钠闪石流纹岩、球粒流纹岩,其与该组粒玄岩、玄武岩的岩石组合构成双峰式火山岩。据此确认本区晚石炭世处于区域伸展构造环境。沉积特征、岩浆活动特征佐证晚石炭世-早二叠世,研究区经历了裂谷的开启→闭合→再次开裂演化过程,其动力学机制与北疆地区洋壳俯冲和板块碰撞作用有直接关系。研究区自晚石炭世-早二叠世经历了陆相-浅海相-陆相的反复升降变化。晚石炭世早期喷发方式为溢流喷发-强烈的爆发式喷发-溢流喷发,火山活动强烈;随后火山活动减弱,转为浅海相的碎屑岩沉积,夹少量的火山碎屑,动植物化石丰富;晚期海退,至早二叠世转为陆相,火山活动再次增强。更多还原

【Abstract】 The Dahongliu area,in Barkol County,Xinjiang is located on the south side of the Kalamari-Takzal fault zone,and is located in the combination of the three tectonic belts of the Eastern Junggar orogenic belt,the Bogda Late Paleozoic rift belt,and the Harlik Paleozoic orogenic belt.It is one of the typical areas to study the basements of the Junggar Basin.This paper takes the late Carboniferous-early Permian strata in the study area as the research object,and discussed the characteristics of rock assemblage,lithology and lithofacies,eruption,petro chemistry,tectonic environment,age attribution and other in detail;this study provides a basis to further understand the late Paleozoic tectonic evolution process in East Junggar region.This time,on the basis of fully collecting and studying previous data,we conducted detailed field geological surveys,isotope chronology,and rock geochemistry research were carried out,and the following main understandings were obtained:1.We obtained zircon U-Pb age of(318.9±2.6)Ma and(279.1±1.5)Ma in Upper subgroup Formation which belong to lower Carboniferous Yamansu Formation,and According to the characteristics of chronology,stratigraphy,and petrology,the formation was disintegrated and re-identified as Upper Carboniferous Batamayinishan Formation,Upper Carboniferous Shiqiantan Formation,Upper Carboniferous Liukeshu Formation,Lower Permian Karagang Group;and the ancient crater was identified for the first time in the newly designated Batamayineshan Formation.The Upper Carboniferous Shiqiantan Formation and the underlying Batamayineshan Formation were re-defined as angular unconformities,and the Lower Permian Karagang Formation and the underlying Liukeshu Formation were eruptive unconformities,and multiple regional structural interfaces were identified.2.The Late Carboniferous-Early Permian sedimentary environment,tectonic background and evolution process in the study area are discussed:A large number of A-type(alkaline)rhyolites have been discovered in the Batamayinishan Formation which was new divided.The rock types include sodium amphibolite rhyolite and spherulitic rhyolite.Its combination with the rock of this formation of dolerite and basalt forms a bimodal volcanic rock.Based on this,this paper confirmed that this area was in a regional extensional tectonic environment during the Late Carboniferous.The characteristics of Sedimentary and magmatic activity support that the study area has experienced the evolution process of rift opening→closing→re-cracking during the Late Carboniferous to Early Permian.Its dynamic mechanism is directly related to the subduction of oceanic crust and plate collision in northern Xinjiang.The study area has experienced repeated ups and downs of continental facies-shallow marine facies-terrestrial facies from the Late Carboniferous to Early Permian.The early eruption mode of the Late Carboniferous was overflow eruption-strong eruption-overflow eruption,and the volcanic activity was strong;then the volcanic activity weakened and turned into shallow marine facies clastic rock deposition with a small amount of pyroclastic debris,animal and plant fossils Abundant;late retreat,transforming to continental in the early Permian,and volcanic activity strengthened again.更多还原