發(fā)布時(shí)間：2018-03-13 15:18

  本文選題：伊犁盆地　切入點(diǎn)：侏羅紀(jì)　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：伊犁盆地位于天山造山帶中,是在塔里木板塊和哈薩克斯坦板塊的南北對沖擠壓作用下形成的大型內(nèi)陸山間拗陷盆地。伊犁盆地南緣侏羅系砂體中,賦存砂巖型鈾礦,砂體的展布特征直接影響著砂巖型鈾礦的發(fā)育。對盆地南緣侏羅系的沉積構(gòu)造及沉積相的展布特征研究將有助于了解砂體的展布。自侏羅紀(jì)以來,伊犁盆地經(jīng)歷了多次的擠壓構(gòu)造運(yùn)動(dòng),而侏羅紀(jì)原型盆地面貌已經(jīng)改變,恢復(fù)原型盆地面貌有助于更好的了解侏羅系沉積相的展布特征。本文以沉積學(xué)和沉積盆地構(gòu)造分析理論為指導(dǎo),以野外地質(zhì)調(diào)查為基礎(chǔ),綜合運(yùn)用鉆孔巖心資料,結(jié)合研究區(qū)巖石樣品粒度特征及已有地球物理資料的解釋分析,對伊犁盆地南緣侏羅紀(jì)殘留地層的沉積特征和相標(biāo)志進(jìn)行研究,劃分了盆地南緣構(gòu)造單元,恢復(fù)了伊犁盆地南緣侏羅紀(jì)不同時(shí)期盆地的原始面貌。伊犁盆地南緣發(fā)育中下侏羅統(tǒng)水西溝群八道灣組、三工河組和西山窯組,及中侏羅統(tǒng)頭屯河組,而上侏羅統(tǒng)不發(fā)育。中下侏羅統(tǒng)以陸相沉積為主,同時(shí)還發(fā)育陸相的水進(jìn)沉積。研究區(qū)發(fā)育沖積扇-三角洲前緣沉積體系以及河流-三角洲沉積體系。八道灣組為一套巨厚層的紫紅色礫巖,超覆在下伏三疊系之上,為一套沖積扇沉積;三工河組巖性為灰色厚層砂巖夾泥巖,發(fā)育不穩(wěn)定薄煤層,為三角洲前緣相沉積;西山窯組巖性主要為灰色厚層砂巖夾泥巖,發(fā)育多層穩(wěn)定展布厚煤層,說明此時(shí)水體較淺,為辮狀河三角洲前緣相和平原相沉積;頭屯河組主要巖性為雜色泥巖,反映水體進(jìn)一步變淺,為辮狀河三角洲平原相沉積。早侏羅世八道灣期,察布查爾山隆起,盆地發(fā)生南北向斷陷,在山前形成多個(gè)沖積扇扇體,此時(shí)湖盆開始擴(kuò)張,盆地處于強(qiáng)伸展階段;早侏羅世三工河期,湖盆范圍進(jìn)一步擴(kuò)大,研究區(qū)為一套三角洲前緣相沉積,盆地處于弱伸展階段;中侏羅世西山窯期,發(fā)育多次短旋回的水退和水進(jìn),湖盆水體變淺,區(qū)域大面積持續(xù)沼澤化,形成厚層砂巖層夾泥巖層和多層厚煤層,研究區(qū)為一套辮狀河三角洲前緣相和平原相沉積;中侏羅世頭屯河期,盆地內(nèi)部水體逐漸退卻,為一套辮狀河平原相沉積,盆地整體處于弱抬升階段。
[Abstract]:The Yili basin, located in the Tianshan orogenic belt, is a large inland intermountain depression basin formed by the north and south hedging of the Tarim plate and the Kazakhstan plate. The sandstone-type uranium deposits are located in the Jurassic sandbodies in the southern margin of the Yili Basin. The distribution characteristics of sand bodies directly affect the development of sandstone-type uranium deposits. The study of sedimentary structures and sedimentary facies of Jurassic in the southern margin of the basin will be helpful to understand the distribution of sandbodies. The Yili basin has undergone many compressional tectonic movements, and the appearance of the Jurassic prototype basin has changed. The restoration of prototype basin features is helpful to better understand the distribution characteristics of Jurassic sedimentary facies. This paper, guided by sedimentology and sedimentary basin structural analysis theory and based on field geological survey, makes comprehensive use of borehole core data. Based on the grain size characteristics of rock samples and the interpretation and analysis of geophysical data, the sedimentary characteristics and facies markers of Jurassic residual strata in the southern margin of the Yili Basin are studied, and the tectonic units in the southern margin of the basin are divided. The primitive features of the basins in different Jurassic periods in the southern margin of the Yili Basin have been restored. The southern margin of the Yili Basin has developed the Badaowan formation, the Sangonghe formation and the Xishanyao formation of the Middle and Lower Jurassic Shuixigou Group, as well as the Toutunhe formation of the Middle Jurassic. The upper Jurassic is not developed. The middle and lower Jurassic is dominated by continental sediments. The alluvial fan delta front sedimentary system and the fluvial delta sedimentary system are also developed in the study area. The Badaowan formation is a set of very thick fuchsia conglomerates overlying the Lower Triassic. The lithology of the Sangonghe formation is composed of grey thick sandstone mudstone, unstable thin coal seam and delta front facies deposit, and the lithology of Xishanyao formation is mainly gray thick sandstone mudstone with multi-layer stable spreading thick coal seam. The main lithology of Toutunhe formation is mixed mudstone, which reflects the further shallowness of the water body, and the deposition of braided river delta plain facies, and the early Jurassic Badaowan period, which indicates that the water body is shallow, the braided river delta front facies and plain facies are deposited, and the main lithology of Toutunhe formation is mixed mudstone. In the uplift of the Chabucharr Mountains, the basin occurred a north-south fault depression and formed several alluvial fan bodies in the front of the mountain. At this time, the lake basin began to expand and the basin was in the stage of strong extension, and in the early Jurassic Sangonghe period, the area of the lake basin was further expanded. The study area is a set of delta front facies sedimentary, the basin is in the weak extension stage, the middle Jurassic Xishan kiln period, developed several short cycles of water retreat and water advance, the lake basin water body becomes shallow, the area continues to swamp in large area. A set of braided river delta front facies and plain facies were formed in the study area, while in the Middle Jurassic Toutunhe period, the internal water body of the basin gradually retreated, and a set of braided river plain facies deposits were formed in the study area. The whole basin is in the stage of weak uplift.
【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】：2015
【分類號】：P534.52;P619.14

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