發(fā)布時間：2018-04-04 20:13

  本文選題：西昆侖造山帶　切入點：布倫闊勒巖群　出處：《成都理工大學》2017年碩士論文

【摘要】：西昆侖造山帶位于青藏高原西北邊緣,是中央造山帶的重要組成部分,具多旋回碰撞造山特征,是連接泛亞和特提斯構造域重要的構造界線。位于西昆侖造山帶內的布倫闊勒巖群,構造變形和變質異常復雜,記錄了不同期次、不同性質的變質變形事件。本文選取布倫闊勒巖群代表性的剖面進行研究。巖石學及巖相學研究表明,布倫闊勒巖群主要由片巖類、片麻巖類構成,其次為變粒巖、糜棱巖及大理巖。本文主要針對片巖和片麻巖進行地球化學分析測試,主量元素、稀土元素、微量元素特征及地層產狀表明:布倫闊勒巖群片巖類巖石總體應為副變質巖,原巖可能為泥質巖、泥質砂巖、粉砂巖;不含角閃石的片麻巖原巖可能為砂質巖或雜砂巖;含角閃石的片麻巖類,其原巖主體可能為雜砂巖,局部可能夾雜少量火山碎屑沉積巖。根據礦物共生組合及其之間的相互關系,作者發(fā)現研究區(qū)布倫闊勒巖群從早到晚至少經歷了四期變質作用。第一期(M1)為綠片巖相-角閃巖相區(qū)域動力熱流變質作用,主要形成遞增變質帶;第二期(M2)為綠片巖相動力變質作用,形成糜棱巖;第三期(M3)為氣液交代變質作用,表現為偉晶巖脈兩側地層中黑云母被交代形成毛發(fā)狀散亂排列的矽線石,鋯石LAICPMS U-Pb年齡顯示作用時間為燕山早期(179±1.4Ma);第四期(M4)為綠片巖相退變質作用,表現為無向的低溫礦物組合取代高溫礦物組合。研究區(qū)布倫闊勒巖群至少經歷了四期變形作用。第一期(D1)為區(qū)域變形作用,主要形成區(qū)域性片理和片麻理;第二期(D2)為順層擠壓變形作用,主要形成褶皺;第三期(D3)為韌性走滑變形作用,形成小韌性剪切帶和糜棱巖;第四期(D4)是沖斷推覆變形作用,形成逆沖推覆構造。通過變質變形綜合分析,布倫闊勒巖群具以下變質變形關系:區(qū)域動力熱流變質作用(M1)與區(qū)域變形作用(D1)是同變質變形作用;之后疊加順層擠壓變形(D2),僅發(fā)生變形未發(fā)生變質;隨后發(fā)生動力變質(M2),同時發(fā)生韌性走滑變形(D3),二者是同變質變形;之后疊加沖斷推覆變形(D4),僅發(fā)生變形未發(fā)生變質;晚期發(fā)生氣液交代變質作用(M3),僅發(fā)生變質為發(fā)生變形;最晚期發(fā)生退變質作用(M4),僅發(fā)生變質為發(fā)生變形。
[Abstract]:The West Kunlun orogenic belt is located on the northwest margin of the Qinghai-Xizang Plateau. It is an important part of the central orogenic belt with the characteristics of polycyclic collision orogeny and is an important tectonic boundary connecting the pan-Asian and Tethys tectonic domains.The brunkolitic group located in the West Kunlun orogenic belt is characterized by complex structural deformation and metamorphism, which records the metamorphic events of different stages and different properties.In this paper, the representative section of Blunkole rock group is selected to study.The petrological and petrographic studies show that the Bloenkole group is mainly composed of schist, gneiss, metamorphic rock, mylonite and marble.The geochemical analysis and test of schist and gneiss are carried out in this paper. The main elements, rare earth elements, trace element characteristics and stratigraphic occurrence indicate that the schist rocks of the Brunkaule group should generally be parametamorphic rocks, and the primary rocks may be argillaceous rocks.Argillaceous sandstone, siltstone, gneiss without hornblende may be sandy rock or complex sandstone, gneiss containing amphibole may be mainly composed of complex sandstone, and a small amount of pyroclastic sedimentary rock may be mixed locally.Based on the mineral symbiotic assemblages and their interrelationships, the authors found that the brunkolian rock group in the study area has undergone at least four metamorphic periods from early to late.The first stage is the regional dynamic heat flow metamorphism of the greenschist facies and amphibolite facies, and the second stage is the progressive metamorphism zone, the second stage is the greenschist facies dynamic metamorphism to form mylonite, the third stage is the gas-liquid metasomatic metamorphism.It is characterized by the metasomatism of biotite in both sides of the pegmatite vein to form hairlike and scattered sillimanite. The LAICPMS U-Pb age of zircon shows that the time of action is 179 鹵1.4 Mai in the early Yanshanian period, and the fourth stage is the retrograde metamorphism of greenschist facies, the fourth stage of which is the retrograde metamorphism of greenschist facies.The undirected low temperature mineral assemblage replaces the high temperature mineral combination.The study area has undergone at least four stages of deformation.The first stage is regional deformation, which mainly forms regional lithology and schism, the second stage is bedding extrusion deformation, and the third stage is ductile strike-slip deformation, forming small ductile shear zone and mylonite, the second stage is bedding extrusion deformation, the third stage is ductile strike-slip deformation, and the third stage is ductile strike-slip deformation, forming small ductile shear zone and mylonite.The fourth stage (D 4) is the deformation of thrust nappe, forming thrust nappe structure.According to the comprehensive analysis of metamorphic deformation, there are the following metamorphic deformation relationships in the Blungoule rock group: regional dynamic heat flow metamorphism (M _ 1) and regional deformation (D _ 1) are the same metamorphic deformation, and then superimposed bedding compression deformation (D _ 2), only the deformation does not occur metamorphism;The dynamic metamorphism of M _ (2) and ductile strike-slip deformation (D _ (3)) occurred, which were the same metamorphic deformation, then superimposed nappe deformation (D _ (4)) occurred only without metamorphism, and the late stage of gas-liquid metasomatic metamorphism (M _ (3)) occurred only metamorphism.Retrograde metamorphism occurred in the late stage, and only metamorphism occurred as deformation.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P542;P588.3

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