本文選題：準噶爾盆地 + 侏羅紀��； 參考：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：準噶爾盆地南緣和東緣侏羅系發(fā)育良好,沉積特征明顯,是研究侏羅系沉積環(huán)境和構(gòu)造背景的理想地層。通過對準噶爾盆地南緣和東緣侏羅系共5條剖面的地層沉積特征進行研究,確定了侏羅系的巖石類型和沉積相類型,總結(jié)了各種沉積相和微相的特征,分析了沉積物源區(qū),并對準噶爾盆地東緣的構(gòu)造-沉積演化過程進行重塑。研究區(qū)巖石類型主要有礫巖、砂巖、粉砂巖、泥巖和泥質(zhì)灰?guī)r。研究區(qū)沉積相類型主要為辮狀河流相、辮狀河三角洲相、曲流河三角洲相和湖泊相。在沉積物源區(qū)方面,準噶爾盆地南緣侏羅系的物源來自于天山造山帶的支脈博格達山;準噶爾盆地的東北緣侏羅系的物源來自于克拉美麗造山帶。在構(gòu)造-沉積演化方面,受博格達山和克拉美麗山隆升作用的影響,在侏羅系的不同時期,盆地東部的南、北兩側(cè)顯示出不同的沉積相組合。早侏羅世,準噶爾盆地南側(cè)的博格達山脈和東北側(cè)的克拉美麗山均快速隆升,準噶爾盆地南緣和東北緣的沉積相均為辮狀河三角洲沉積相,盆地內(nèi)部則發(fā)育半深湖-深湖相。在此期間,準噶爾盆地經(jīng)歷了幾次規(guī)模較大的湖侵,盆地內(nèi)大部分地區(qū)被湖泊淹沒,煤層不發(fā)育,物源供給較少。中侏羅世早期,準噶爾盆地南側(cè)的博格達山脈和北側(cè)的克拉美麗山脈的隆升速度均較低,準噶爾盆地南北都形成了曲流河三角洲沉積相。中侏羅世后期-晚侏羅世,準噶爾盆地南側(cè)的博格達山脈隆起較快,發(fā)育了頭屯河組-喀拉扎組的辮狀河-辮狀河三角洲沉積相;盆地東北部的克拉美麗山隆升速度較緩,發(fā)育了曲流河三角洲的石樹溝群的沉積。此期間,兩側(cè)山脈的隆升導致湖平面下降,水體深度變淺,盆地內(nèi)部由半深湖相變?yōu)闇\湖相。此時氣候溫暖濕潤,植物生長最為繁盛,盆地內(nèi)形成了大面積的沼澤環(huán)境,煤層發(fā)育達到極盛時期。
[Abstract]:Jurassic in the southern and eastern margin of Junggar Basin is well developed and has obvious sedimentary characteristics. It is an ideal stratum for studying the sedimentary environment and tectonic setting of Jurassic.Based on the study of sedimentary characteristics of five Jurassic sections in the southern and eastern margin of Junggar Basin, the types of Jurassic rocks and sedimentary facies are determined, the characteristics of various sedimentary facies and microfacies are summarized, and the source areas of sediments are analyzed.The tectonic-sedimentary evolution process in the eastern margin of Junggar Basin was remolded.The main rock types in the study area are conglomerate, sandstone, siltstone, mudstone and argillaceous limestone.The sedimentary facies in the study area are mainly braided fluvial facies, braided river delta facies, meandering river delta facies and lacustrine facies.In terms of sediment source, the source of Jurassic in the southern margin of Junggar Basin comes from the Bogda Mountains, a branch of the Tianshan orogenic belt, and the material source of Jurassic in the northeast margin of Junggar Basin comes from the Kramer orogenic belt.In terms of tectonic-sedimentary evolution, due to the uplift of the Bogda Mountains and the Clarisian Mountains, there are different sedimentary facies assemblages on the south and north sides of the eastern part of the basin at different stages of the Jurassic system.In the early Jurassic, the Bogda Mountains in the southern side of Junggar Basin and the Kelieshan Mountains in the northeast side of the Junggar Basin rose rapidly. The sedimentary facies of the southern margin and the northeast margin of the Junggar Basin were both braided river delta sedimentary facies, while the half-deep lacustry-deep lacustrine facies were developed in the interior of the basin.During this period, Junggar Basin experienced several large-scale lake transgressions. Most areas of the basin were submerged by lakes, the coal seams were not developed, and the material supply was less.In the early Middle Jurassic, the uplift rate of the Bogda Mountains in the south of Junggar Basin and the Clemish Mountains in the north side of the Junggar Basin were lower, and the meandering river delta sedimentary facies were formed in the north and south of Junggar Basin.From the late Middle Jurassic to the late Jurassic, the Bogda mountain uplift in the southern side of Junggar basin was relatively rapid, and the braided river braided river delta sedimentary facies of Toutunhe formation and Kalazar formation were developed, while the uplift rate of Kramieshan in the northeastern part of the basin was relatively slow.The deposits of the Shishugou Group in the meandering River Delta have been developed.During this period, the uplift of the mountains on both sides of the basin caused the lake level to decrease, the depth of the water body shallower, and the interior of the basin changed from semi-deep lacustrine to shallow lacustrine.At this time, the climate is warm and humid, plant growth is the most prosperous, a large area of swamp environment has been formed in the basin, and the coal seam has reached the peak stage.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.11;P534.52

【參考文獻】

相關期刊論文 前10條

1 鄧宏文,王紅亮,寧寧;沉積物體積分配原理——高分辨率層序地層學的理論基礎[J];地學前緣;2000年04期

2 康志宏;;準噶爾盆地古生代沉積演化特征[J];地質(zhì)力學學報;2011年02期

3 方世虎;郭召杰;吳朝東;張志誠;王美娜;袁慶東;;準噶爾盆地南緣侏羅系碎屑成分特征及其對構(gòu)造屬性、盆山格局的指示意義[J];地質(zhì)學報;2006年02期

4 呂嶸;汪新文;沈勇偉;;準噶爾盆地南緣中新生代構(gòu)造沉降史分析[J];石油天然氣學報(江漢石油學院學報);2006年05期

5 李興平,李靜璉,王國司;準噶爾盆地東部五彩灣地區(qū)層序框架[J];石油實驗地質(zhì);1997年01期

6 張滿郎,張琴,朱筱敏;準噶爾盆地侏羅系層序地層劃分探討[J];石油實驗地質(zhì);2000年03期

7 邢煥清;;準噶爾盆地侏羅系層序地層研究展望[J];石油實驗地質(zhì);2006年01期

8 朱筱敏,康安,張琴,張滿郎,況軍,吳曉智,韓軍;準噶爾盆地東北緣侏羅系含煤巖系層序地層和隱蔽圈閉[J];石油與天然氣地質(zhì);2002年02期

9 鄧宏文，，王洪亮，李熙U

本文編號：1760897