本文選題：安南壩蛇綠構(gòu)造混雜巖帶 + 物質(zhì)組成　； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：蛇綠構(gòu)造混雜巖帶是造山帶非史密斯地層體中最具代表性的地質(zhì)實(shí)體,其形成過程一般都經(jīng)歷了大洋巖石圈板塊俯沖、陸陸碰撞以及隆升走滑等構(gòu)造過程,導(dǎo)致物質(zhì)組成、構(gòu)造變形、成礦作用過程極為復(fù)雜,是揭示造山過程、古板塊構(gòu)造演化及成礦過程的重要物質(zhì)載體。本論文在系統(tǒng)分析國內(nèi)外蛇綠混雜巖帶最新研究成果的基礎(chǔ)上,結(jié)合野外地質(zhì)調(diào)查和室內(nèi)分析測試對阿爾金東段安南壩蛇綠構(gòu)造混雜巖帶進(jìn)行深入解剖,為阿爾金地質(zhì)演化、成礦規(guī)律總結(jié)、礦產(chǎn)資源評價(jià)及工程部署提供依據(jù)。通過對安南壩蛇綠構(gòu)造混雜巖帶的物質(zhì)組成、時空展布特征、物質(zhì)組成的時代和地化屬性、構(gòu)造環(huán)境、變形序列、成礦特征、礦體的變化及保存等研究,得到以下認(rèn)識:(1)安南壩地區(qū)的物質(zhì)組成主要為花崗質(zhì)片麻巖巖塊(外來巖塊)、蛇綠巖巖塊、變基性火山巖巖塊(非蛇綠巖組成)、變中-酸性火山巖巖塊及沉積巖-火山沉積巖巖塊5類構(gòu)造巖塊及相應(yīng)成分的剪切基質(zhì)組成;(2)構(gòu)造巖塊(弱變形域)和剪切基質(zhì)(強(qiáng)變形帶)空間上呈相間分布特征,基質(zhì)“包繞”巖塊,呈“網(wǎng)結(jié)狀”構(gòu)造;(3)同位素年代學(xué)顯示安南壩蛇綠構(gòu)造混雜巖帶中花崗質(zhì)片麻巖形成時代為787±19Ma~776±24Ma、變基性火山巖形成時代為524±2Ma、蛇綠巖形成時代為520.4±1.2Ma、變中-酸性火山巖為475±3Ma~450±2Ma、沉積巖-火山沉積巖形成時代為寒武-奧陶紀(jì)和晚石炭世-早二疊世(上疊盆地沉積巖系);(4)上述5類構(gòu)造巖塊的地球化學(xué)特征顯示出的形成環(huán)境分別為:火山弧-板內(nèi)環(huán)境、洋島、洋中脊、島弧、弧后盆地等環(huán)境,其空間分布特征暗示北阿爾金洋由北向南俯沖的極性;(5)根據(jù)混雜巖帶中各種構(gòu)造形跡及其疊加置換關(guān)系,劃分出俯沖期、碰撞期及隆升期構(gòu)造組合,建立了研究區(qū)構(gòu)造變形序列,分析了混雜巖帶形成的力學(xué)性質(zhì),創(chuàng)新性地研究出蛇綠構(gòu)造“對沖式”構(gòu)造樣式;(6)分析了安南壩蛇綠構(gòu)造混雜巖帶成礦特征,并對赤鐵礦(磁鐵礦)體進(jìn)行了礦區(qū)地質(zhì)、礦體及礦石特征、礦體地球化學(xué)、形成時代及成因類型研究;(7)結(jié)合區(qū)域資料和蛇綠構(gòu)造混雜巖帶構(gòu)造演化的4個階段,研究了安南壩赤鐵礦(磁鐵礦)的形成、變化及保存過程;(8)研究了安南壩赤鐵礦(磁鐵礦)體呈透鏡狀(弱變形域)和片理化礦石(強(qiáng)變形帶)的賦存位態(tài),為礦產(chǎn)資源評價(jià)和工程部署提供依據(jù)。
[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 鹵19Ma~776 鹵24 Main, the age of basic volcanic rocks is 524 鹵2Ma, the age of ophiolite is 520.4 鹵1.2 Ma. the age of formation of granitic gneiss is 787 鹵19Ma~776 鹵24Ma. the age of formation of altered basic volcanic rocks is 520.4 鹵1.2Ma. the age of ophiolite is 520.4 鹵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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P587;P612

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