本文關(guān)鍵詞：準(zhǔn)噶爾盆地南緣和東緣地區(qū)上三疊統(tǒng)及沉積特征研究　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

  更多相關(guān)文章： 準(zhǔn)噶爾盆地 晚三疊世 沉積相 層序地層學(xué)

【摘要】：準(zhǔn)噶爾盆地南緣和東緣地區(qū)上三疊統(tǒng)巖石地層稱為小泉溝群,由下向上分為黃山街組和郝家溝組。通過對研究區(qū)露頭剖面的實(shí)測,詳細(xì)觀察了上三疊統(tǒng)的巖石類型、沉積構(gòu)造及其組合特征,詳細(xì)分析了沉積相、亞相和微相,總結(jié)出準(zhǔn)噶爾盆地南緣和東緣晚三疊世的沉積環(huán)境特征。準(zhǔn)噶爾盆地南緣和東緣地區(qū)上三疊統(tǒng)剖面出露較好,沉積標(biāo)志豐富,沉積相標(biāo)志明顯,其沉積環(huán)境均為陸相。沉積相類型主要為三角洲相、河流相和湖泊相。研究區(qū)發(fā)育的河流沉積主要為辮狀河沉積和曲流河沉積,入湖泊所形成的三角洲以辮狀河三角洲和曲流河三角洲為主。其中,準(zhǔn)噶爾南緣地區(qū)的沉積相主要為曲流河和曲流河三角洲,東緣地區(qū)的沉積相主要為辮狀河和辮狀河三角洲。通過對準(zhǔn)噶爾南緣-東緣上三疊統(tǒng)地層發(fā)育、沉積特征、層序地層的研究,可以重塑晚三疊世準(zhǔn)噶爾盆地東部的沉積古地理格局和晚三疊世準(zhǔn)噶爾盆地南側(cè)的博格達(dá)山脈的隆升速度較低,山前地形變緩,形成了準(zhǔn)噶爾盆地南緣黃山街組和郝家溝組曲流河三角洲的沉積;而此時(shí)北部的克拉美麗山繼續(xù)快速隆升,形成了郝家溝組底部的不整合和辮狀河流相的“瑪瑙礫巖”沉積。因此,晚三疊世準(zhǔn)噶爾盆地東部湖盆兩側(cè)的的地勢為南緩北陡。
[Abstract]:The Upper Triassic lithostratigraphy in the southern and eastern margin of Junggar Basin is called the Koizumi Group, which is divided into Huangshanjie formation and Haojiagou formation from the bottom up. The outcrop profile of the study area is measured. The rock types, sedimentary structures and their assemblages of the Upper Triassic are observed in detail. The sedimentary facies, subfacies and microfacies are analyzed in detail. The sedimentary environment characteristics of the late Triassic in the southern margin and eastern margin of Junggar basin are summarized. The upper Triassic section of the southern margin and eastern margin of Junggar basin is better exposed with abundant sedimentary markers and obvious sedimentary facies marks. The sedimentary environment is continental facies. The sedimentary facies are mainly delta facies, fluvial facies and lacustrine facies. The fluvial deposits developed in the study area are mainly braided river deposits and meandering river deposits. The delta formed by the lake is mainly braided river delta and meandering river delta, among which, the sedimentary facies in the southern margin of Junggar are mainly meandering river and meandering river delta. The sedimentary facies in the eastern margin are mainly braided river and braided river delta. The stratigraphic development, sedimentary characteristics and sequence stratigraphy of Upper Triassic in the southern margin of Junggar and the eastern margin of Junggar are studied. The sedimentary paleogeography in the eastern part of the late Triassic Junggar Basin and the uplift rate of the Bogda Mountains on the southern side of the late Triassic Junggar Basin can be remolded. The deposits of Huangshanjie formation and Haojiagou Suite River Delta were formed in the southern margin of Junggar Basin. At this time, the Karamie Mountain in the north continued to uplift rapidly, forming the unconformity at the bottom of the Haojiagou formation and the "agate conglomerate" deposit in the braided fluvial facies. The topography of the eastern lake basin of the late Triassic Junggar Basin is steep in the south and north.
【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】：P618.13;P534.51

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