發(fā)布時間：2018-04-19 20:58

  本文選題：西準噶爾成礦帶 + 晚古生代��； 參考：《中國地質大學(北京)》2015年碩士論文

【摘要】：新疆北部薩吾爾山以南、準噶爾盆地西北緣的西準噶爾地區(qū)(即“西準”),位于西伯利亞、哈薩克斯坦和塔里木板塊的拼合處,屬于哈薩克斯坦古板塊北部增生邊緣;為中亞造山帶夾持在天山斷裂系統(tǒng)與額爾齊斯斷裂之間的一個特殊的北東向地塊,發(fā)育以達拉布特斷裂為代表的NE向左行走滑斷裂構造體系,有別于中亞造山帶西部NW向右行走滑的艾比湖斷裂和西準噶爾以北近東西向左行走滑的額爾齊斯走滑斷裂。西準地區(qū)地質構造比較復雜,主體構造為NE-NEE構造走向,主要為壓性兼扭性結構面,具有NE向的“多字”型走滑斷裂構造體系的特點,并明顯地控制著區(qū)內花崗巖侵入體的分布;同時發(fā)育多個方向的褶皺和斷裂。大規(guī)模的走滑運動可能引起塊體的構造旋轉。西準噶爾地區(qū)是中亞造山帶西部重要的構造-巖漿-成礦帶。本文對西準地區(qū)構造變形、演化與巖漿活動的相互關系做了一些研究工作;采集了西準噶爾成礦帶達拉布特斷裂西北側的廟爾溝-別魯阿嘎希及其附近地區(qū)11個巖體共33個花崗巖類樣品,進行了巖相學、巖石地球化學與同位素示蹤等研究,厘定了該地區(qū)晚古生代巖漿活動的特點與大地構造環(huán)境。研究表明,西準噶爾構造變形非常強烈,尤其南北向的擠壓和北東向的走滑非常明顯;區(qū)內廟爾溝巖體和阿克巴斯套巖體均發(fā)生了逆時針旋轉構造;哈圖地區(qū)晚石炭世花崗巖類主要為后碰撞伸展構造環(huán)境A型花崗巖類,別魯阿嘎希等地區(qū)存在洋內俯沖與島弧環(huán)境的埃達克巖,表明晚古生代西準噶爾地區(qū)構造環(huán)境時空變化的復雜性。該地區(qū)花崗巖類具有較高的εNd(t)值(+4.62-+7.53)、εSr(t)值為( 57.61-+18.21),具有中亞造山帶花崗巖類的基本特征,為古生代增生的新生陸殼,其源區(qū)與虧損地幔組分具有親緣關系;花崗巖類206Pb/204Pb比值為18.2776-19.1677、207Pb/204Pb比值為15.5260-15.5796、208Pb/204Pb比值為38.2080-39.0821,為造山帶花崗巖類,與天山、阿爾泰山和巴爾喀什成礦帶花崗巖類近似。根據(jù)地質構造的關系,西準噶爾與巴爾喀什可能是中亞造山帶西段一個連續(xù)的東西向構造-巖漿活動成礦帶。
[Abstract]:The West Junggar region, south of Sawuer Mountains in northern Xinjiang and the northwest margin of Junggar Basin, is located in Siberia, where Kazakhstan and Tarim plates join together, and belong to the northern accretive margin of the ancient Kazakstan plate. As a special NE block between Tianshan fault system and Erzis fault, the central Asian orogenic belt developed NE trending strike-slip fault system represented by Dalabut fault. Different from the west of the Central Asian orogenic belt, the Ebinur fault is different from the NW strike slip in the west of Central Asia and the Erzis strike-slip fault north of the west Junggar to the east to the west. The geological structure in Xizhong area is quite complex, the main structure is NE-NEE structural strike, which is mainly compressional and torsional structural plane. It has the characteristics of NE direction "multi-character" type strike-slip fault system, and obviously controls the distribution of granite intrusion in the area. At the same time, multiple directions of folds and faults are developed. Large-scale strike-slip motion may cause tectonic rotation of blocks. The West Junggar area is an important tectonic-magma-metallogenic belt in the western part of the Central Asian orogenic belt. In this paper, the relationship between tectonic deformation, evolution and magmatic activity in Xizhong area is studied. A total of 33 granitic samples were collected from the Miaoergou-Beluagaxi and its adjacent areas in the northwestern side of the Darabut fault in the West Junggar metallogenic belt. Petrographic, petrogeochemical and isotopic tracer studies have been carried out. The characteristics and tectonic environment of late Paleozoic magmatism in this area are determined. The results show that the deformation of the West Junggar structure is very strong, especially the compression in the north-south direction and the strike slip in the north-east direction, the Miaoergou rock body and the Akbasset rock body in the area have been rotated counterclockwise; The late Carboniferous granitoids are mainly A-type granitoids in the post-collisional extensional tectonic environment in the Hattu area, and the adakite in the Beilu Agahi area is characterized by intraoceanic subduction and island arc environment. It indicates the complexity of spatiotemporal variation of tectonic environment in the West Junggar area of late Paleozoic. The granitoids in this area have higher 蔚 Ndndnt values (4.62-7.53) and (57.61-18.21), which have the basic characteristics of granitic type in the Central Asian orogenic belt, and belong to the Cenozoic continental crust of Paleozoic accretion, and the source region is related to the depleted mantle component. The 206Pb/204Pb ratio of granitoids is 18.2776-19.1677207Pb/204Pb and the ratio of 15.5260-15.5796208Pb/204Pb is 38.2080-39.0821, which is the granitic type of orogenic belt, which is similar to the granitoids of Tianshan, Altaishan and Balkash metallogenic belts. According to the relationship of geological structure, West Junggar and Balkesh may be a continuous east-west tectonic-magmatic metallogenic belt in the western segment of the Central Asian orogenic belt.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P588.121;P612

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