阿尔金安南坝地区蛇绿构造混杂岩带的物质组成、构造变形及成矿特征研究
本文选题:安南坝蛇绿构造混杂岩带 + 物质组成 ; 参考:《中国地质大学(北京)》2017年硕士论文
【摘要】:蛇绿构造混杂岩带是造山带非史密斯地层体中最具代表性的地质实体,其形成过程一般都经历了大洋岩石圈板块俯冲、陆陆碰撞以及隆升走滑等构造过程,导致物质组成、构造变形、成矿作用过程极为复杂,是揭示造山过程、古板块构造演化及成矿过程的重要物质载体。本论文在系统分析国内外蛇绿混杂岩带最新研究成果的基础上,结合野外地质调查和室内分析测试对阿尔金东段安南坝蛇绿构造混杂岩带进行深入解剖,为阿尔金地质演化、成矿规律总结、矿产资源评价及工程部署提供依据。通过对安南坝蛇绿构造混杂岩带的物质组成、时空展布特征、物质组成的时代和地化属性、构造环境、变形序列、成矿特征、矿体的变化及保存等研究,得到以下认识:(1)安南坝地区的物质组成主要为花岗质片麻岩岩块(外来岩块)、蛇绿岩岩块、变基性火山岩岩块(非蛇绿岩组成)、变中-酸性火山岩岩块及沉积岩-火山沉积岩岩块5类构造岩块及相应成分的剪切基质组成;(2)构造岩块(弱变形域)和剪切基质(强变形带)空间上呈相间分布特征,基质“包绕”岩块,呈“网结状”构造;(3)同位素年代学显示安南坝蛇绿构造混杂岩带中花岗质片麻岩形成时代为787±19Ma~776±24Ma、变基性火山岩形成时代为524±2Ma、蛇绿岩形成时代为520.4±1.2Ma、变中-酸性火山岩为475±3Ma~450±2Ma、沉积岩-火山沉积岩形成时代为寒武-奥陶纪和晚石炭世-早二叠世(上叠盆地沉积岩系);(4)上述5类构造岩块的地球化学特征显示出的形成环境分别为:火山弧-板内环境、洋岛、洋中脊、岛弧、弧后盆地等环境,其空间分布特征暗示北阿尔金洋由北向南俯冲的极性;(5)根据混杂岩带中各种构造形迹及其叠加置换关系,划分出俯冲期、碰撞期及隆升期构造组合,建立了研究区构造变形序列,分析了混杂岩带形成的力学性质,创新性地研究出蛇绿构造“对冲式”构造样式;(6)分析了安南坝蛇绿构造混杂岩带成矿特征,并对赤铁矿(磁铁矿)体进行了矿区地质、矿体及矿石特征、矿体地球化学、形成时代及成因类型研究;(7)结合区域资料和蛇绿构造混杂岩带构造演化的4个阶段,研究了安南坝赤铁矿(磁铁矿)的形成、变化及保存过程;(8)研究了安南坝赤铁矿(磁铁矿)体呈透镜状(弱变形域)和片理化矿石(强变形带)的赋存位态,为矿产资源评价和工程部署提供依据。
[Abstract]:The ophiolitic melange belt is the most representative geological entity in the non-Smith stratigraphic body of the orogenic belt. Its forming process generally experienced the tectonic processes of oceanic lithospheric plate subduction, continental collision and uplift strike-slip, which resulted in material composition. Tectonic deformation and metallogenic process are very complex, which is an important material carrier to reveal orogenic process, paleo-plate tectonic evolution and metallogenic process. On the basis of systematic analysis of the latest research results of the ophiolite melange belt at home and abroad, combined with field geological survey and laboratory analysis and test, this paper deeply dissects the Annanba ophiolite melange belt in the eastern section of Altun, which is the geological evolution of Altun. Summary of metallogenic law, evaluation of mineral resources and engineering deployment to provide the basis. Based on the study of material composition, space-time distribution characteristics, age and geochemical attributes of material composition, tectonic environment, deformation sequence, metallogenic characteristics, changes and preservation of orebody, etc. The material composition of the Annanba area is mainly composed of granitic gneiss blocks (alien rock blocks, ophiolite blocks, etc.) Metamorphic volcanic rock block (non-ophiolite composition, metamorphic intermediate-acid volcanic rock block and sedimentary rock-volcanic sedimentary rock block, and shearing matrix composition of corresponding components) tectonic block (weak deformation region) and shearing The spatial distribution of matrix (strong deformation zone) is interphase. Matrix "wrapped" rock block, Isotopic chronology shows that the age of granitic gneiss is 787 卤19Ma~776 卤24 Main, the age of basic volcanic rocks is 524 卤2Ma, the age of ophiolite is 520.4 卤1.2 Ma. the age of formation of granitic gneiss is 787 卤19Ma~776 卤24Ma. the age of formation of altered basic volcanic rocks is 520.4 卤1.2Ma. the age of ophiolite is 520.4 卤1.2Ma. The sedimentary rock-volcanic sedimentary rocks were formed in Cambrian-Ordovician and late Carboniferous to early Permian (Upper Permian Sedimentary rock series). The geochemical characteristics of the five types of tectonic blocks show that the formation environment is: fire. Mountain Arc-Intra-plate Environment, In the environment of oceanic island, mid-oceanic ridge, island arc, back-arc basin, whose spatial distribution features imply that the North Altun Ocean subducts from north to south, the subduction period is divided according to various structural patterns and their superimposed displacement relationships in the melange belt. In the collision and uplift tectonic assemblages, the tectonic deformation sequence of the studied area is established, and the mechanical properties of the melange belt are analyzed. In this paper, the ore-forming characteristics of Annanba ophiolitic structure melange belt are analyzed, and the ore geology, orebody and ore characteristics, orebody geochemistry of hematite (magnetite) body are studied. The formation of Annanba hematite (magnetite) was studied in combination with regional data and four stages of tectonic evolution in the ophiolite melange belt. The variation and preservation process of Annanba hematite (magnetite) have been studied in this paper. They are lenticular (weak deformation domain) and sheet physicochemical ore (strong deformation zone), which provide the basis for mineral resource evaluation and engineering deployment.
【学位授予单位】:中国地质大学(北京)
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:P587;P612
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