【摘要】：研究區(qū)位于青藏高原東北緣祁連山脈,主體屬于中祁連陸塊。本文以疏勒河地區(qū)出露的奧陶系吾力溝組為研究對(duì)象,通過(guò)野外路線調(diào)查、實(shí)測(cè)剖面,薄片鑒定,巖石地球化學(xué)分析及室內(nèi)綜合研究,厘定吾力溝組的地層特征和構(gòu)造屬性,為進(jìn)一步探討中南祁連構(gòu)造屬性及地質(zhì)演化過(guò)程提供新的約束材料。論文取得的主要認(rèn)識(shí)如下:1、疏勒河地區(qū)發(fā)育一套早古生代地層,地層由老到新分別是奧陶系吾力溝組(O1w)、鹽池灣組(O2y)及志留系巴龍貢嘎?tīng)柦M(Sb)。2、厘定出研究區(qū)吾力溝組主要為遠(yuǎn)洋硅泥質(zhì)沉積和細(xì)復(fù)理石沉積,夾水下扇礫巖與玄武巖夾火山碎屑巖,垂向上由2個(gè)沉積-噴發(fā)旋回構(gòu)成,硅質(zhì)巖和紫紅色硅泥質(zhì)巖主要發(fā)育于下部旋回的底部,兩個(gè)旋回的中部表現(xiàn)為復(fù)理石沉積夾水下扇礫巖;旋回的頂部為玄武巖、火山角礫巖、火山碎屑巖和灰?guī)r、大理巖化灰?guī)r。3、根據(jù)吾力溝組的發(fā)育位置、巖石組合與區(qū)域地質(zhì)對(duì)比分析,推斷吾力溝組的發(fā)育背景為盆地建造中穩(wěn)定性與活動(dòng)性交替變換,呈動(dòng)蕩環(huán)境。4、通過(guò)巖石地球化學(xué)分析,得出吾力溝組中基性火山巖屬于鈣堿性系列和高鉀鈣堿性系列。球粒隕石標(biāo)準(zhǔn)化稀土元素配分曲線總體變化規(guī)律一致,輕重稀土分餾特征較明顯;基性火山巖的稀土總量高于中性火山巖稀土總量,且兩者輕稀土元素較重稀土富集,呈現(xiàn)輕稀土元素富集的右傾曲線,無(wú)明顯Eu異常。5、通過(guò)對(duì)吾力溝組火山巖大地構(gòu)造環(huán)境的判別,分析出其形成環(huán)境為洋島環(huán)境。
[Abstract]:The study area is located in the Qilian Mountains in the northeast margin of the Qinghai-Xizang Plateau and belongs to the Middle Qilian block. Taking the Ordovician Wuligou formation exposed in Shule River area as the research object, the stratigraphic characteristics and structural attributes of the Ordovician Wuligou formation are determined by field route investigation, measured profile, thin section identification, rock geochemistry analysis and laboratory comprehensive study. It provides a new constraint material for the further study of tectonic attributes and geological evolution process of Qilian in central and southern China. The main knowledge obtained in this paper is as follows: 1. A set of early Paleozoic strata developed in the Shule River area. The strata from Lao to Xin are Ordovician Wuligou formation (O1w), Yanchi Bay formation (O2y) and Silurian Baronggaer formation (Sb). 2. It is determined that the Wuligou formation in the study area is mainly oceanic siliceous muddy sedimentary and fine claystone deposit. The subaqueous fan conglomerate and basalt intercalate volcanic clastic rocks, which are composed of two sedimentary eruptive cycles vertically. The siliceous rocks and purplish red siliceous mudstones are mainly developed at the bottom of the lower cycle. The central part of the two cycles is represented by the flysch sedimentary intercalated underwater fan conglomerate, the top of the cycle is basalt, volcanic breccia, pyroclastic rock and limestone, marble limestone. 3, according to the development position of Wuligou formation, Rock assemblage and regional geological correlation analysis, it is inferred that the development background of Wuligou formation is the alternation of stability and activity in the formation of the basin, with a turbulent environment of .4.Through rock geochemistry analysis, It is concluded that the middle and basic volcanic rocks of Wuligou formation belong to calc-alkaline series and high-potassium calc-alkaline series. The distribution curve of standardized rare earth elements of chondrites is consistent, and the fractionation characteristics of light and light rare earth elements are obvious, the total amount of rare earth elements in basic volcanic rocks is higher than that in neutral volcanic rocks, and both light rare earth elements are enriched in heavy rare earths. There is no obvious Eu anomaly. 5. By discriminating the tectonic environment of volcanic rocks in Wuli Gou formation, it is found that the formation environment is an oceanic island environment.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P534.42

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