準(zhǔn)噶爾盆地南緣和東緣二疊系高分辨層序地層研究
發(fā)布時間：2018-07-22 14:41
【摘要】：論文依托“準(zhǔn)噶爾盆地南緣和東緣地區(qū)二疊系—侏羅系野外地質(zhì)考察及沉積特征研究”項目,在廣泛收集前人地層、沉積等相關(guān)資料的基礎(chǔ)上,通過野外露頭剖面實測以及室內(nèi)資料分析,研究了該區(qū)二疊系沉積特征及其構(gòu)造意義,取得以下主要成果和認識:1、通過4條實測地層剖面的深入研究,建立了準(zhǔn)噶爾盆地南緣和東緣二疊系完整的地層序列。2、根據(jù)四射珊瑚、蜓類化石鑒定結(jié)果,認為準(zhǔn)噶爾盆地南緣石人子溝組的時代為晚石炭世,而不是前人認為的早二疊世。3、通過剖面巖石類型、沉積構(gòu)造及含化石特征分析,將準(zhǔn)噶爾盆地南緣和東緣二疊系劃分為普遍發(fā)育的辮狀河流相、辮狀河三角洲相和湖泊相三種主要沉積相類型,以及僅見于準(zhǔn)噶爾南緣的下二疊統(tǒng)陸源碎屑濱淺海相,并對各種相類型的亞相、微相及沉積特征進行了深入研究。4、根據(jù)準(zhǔn)噶爾盆地南緣和東緣二疊系露頭高分辨層序地層學(xué)研究,建立了不同級別層序的識別標(biāo)志,劃分了各剖面的短期基準(zhǔn)面旋回(五級層序)、中期基準(zhǔn)面旋回(四級層序)和長期基準(zhǔn)面旋回(三級層序)。在準(zhǔn)噶爾盆地南緣的二疊系劃分了7個三級層序;在準(zhǔn)噶爾盆地東緣的二疊系劃分了2個三級層序。5、通過剖面對比,建立了準(zhǔn)噶爾盆地南緣和東緣二疊系的綜合地層格架和沉積格架,結(jié)合前人資料,以世為單位編制了準(zhǔn)噶爾盆地東部沉積古地理圖3張。6、綜合以上研究,探討了準(zhǔn)噶爾盆地東部構(gòu)造-沉積演化歷史,認為準(zhǔn)噶爾盆地南緣和東緣二疊紀(jì)的沉積歷史存在著明顯的差異。首先,兩側(cè)山脈開始隆升的時間不同,南緣在早二疊世為殘余海盆、中二疊世海水徹底退出并演化為深水湖盆,發(fā)育了厚層油頁巖,說明此時博格達山脈尚未開始隆升;而準(zhǔn)噶爾盆地東北緣的卡拉麥里山自早二疊世便已經(jīng)開始隆升,造成盆地東緣的二疊系早期地層的缺失和后期辮狀河-辮狀河三角洲相的粗碎屑沉積的廣泛發(fā)育。其次,南緣和東緣二疊紀(jì)的山脈隆升的節(jié)律也不同,盆地南側(cè)的博格達山脈和北側(cè)的卡拉麥里山脈隆升演化歷史的差異是造成準(zhǔn)噶爾盆地兩側(cè)沉積盆地二疊系的充填序列、巖性巖相、沉積厚度等方面差異的根本原因。
[Abstract]:Based on the project of "Field Geological investigation and Sedimentary characteristics Research of Permian-Jurassic system in the Southern margin and Eastern margin of Junggar Basin", the paper collects the related data of previous strata, deposits and so on. In this paper, the sedimentary characteristics and tectonic significance of Permian system in this area are studied through field outcrop profile measurement and indoor data analysis. The following main achievements and understandings are obtained, and further research on 4 measured stratigraphic sections is made. The complete stratigraphic sequence of Permian in the southern margin and eastern margin of Junggar Basin was established. According to the results of the identification of the Quaternary corals and the fossils, it is considered that the age of the Shirenzigou formation in the southern margin of Junggar Basin is the late Carboniferous. By analyzing the rock types, sedimentary structures and fossilized features of the section, Permian in the southern and eastern margin of Junggar Basin is divided into generally developed braided fluvial facies. Braided river delta facies and lacustrine facies are three main sedimentary facies types, as well as the lower Permian continental clastic shoreline facies in the southern margin of Junggar, and the subfacies of various facies types. The microfacies and sedimentary characteristics are studied in depth. Based on the study of high-resolution sequence stratigraphy of Permian outcrops in the southern margin and eastern margin of Junggar Basin, the identification criteria of different sequences are established. The short-term base-level cycles (five-grade sequences), the intermediate base-level cycles (quarter-order sequences) and the long-term base-level cycles (third-order sequences) of each profile are divided. The Permian in the southern margin of Junggar Basin is divided into 7 third-order sequences, and in the eastern margin of Junggar Basin, two third-order sequences. The Synthetical stratigraphic framework and sedimentary framework of the Permian system in the southern and eastern margin of Junggar Basin were established. Combined with the previous data, the sedimentary paleogeography map of the eastern Junggar Basin was compiled in the unit of epoch. The history of tectonic-sedimentary evolution in the eastern Junggar basin is discussed. It is considered that there are obvious differences in the sedimentary history of the Permian period between the southern margin of Junggar basin and the eastern margin of Junggar basin. First of all, the time when the mountains on both sides began to uplift was different. The southern margin was a residual basin in the early Permian, and the middle Permian sea water completely exited and evolved into a deep-water lake basin, which showed that the Bogda Mountains had not started to uplift at this time. The Calamari Mountains in the northeastern margin of Junggar Basin have been uplifted since the early Permian, resulting in the absence of early Permian strata in the eastern margin of the basin and the extensive development of coarse detrital deposits in the late braided fluvial braided river delta facies. Secondly, the rhythm of the Permian mountain uplift in the southern margin and the eastern margin is also different. The difference in the evolution history of the Bogda Mountains on the southern side of the basin and the Karamari Mountains on the north side of the basin is the filling sequence of the Permian sedimentary basins on both sides of the Junggar basin. The fundamental cause of the difference in lithology, lithofacies and sedimentary thickness.
【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;P539.2
本文編號：2137794
[Abstract]:Based on the project of "Field Geological investigation and Sedimentary characteristics Research of Permian-Jurassic system in the Southern margin and Eastern margin of Junggar Basin", the paper collects the related data of previous strata, deposits and so on. In this paper, the sedimentary characteristics and tectonic significance of Permian system in this area are studied through field outcrop profile measurement and indoor data analysis. The following main achievements and understandings are obtained, and further research on 4 measured stratigraphic sections is made. The complete stratigraphic sequence of Permian in the southern margin and eastern margin of Junggar Basin was established. According to the results of the identification of the Quaternary corals and the fossils, it is considered that the age of the Shirenzigou formation in the southern margin of Junggar Basin is the late Carboniferous. By analyzing the rock types, sedimentary structures and fossilized features of the section, Permian in the southern and eastern margin of Junggar Basin is divided into generally developed braided fluvial facies. Braided river delta facies and lacustrine facies are three main sedimentary facies types, as well as the lower Permian continental clastic shoreline facies in the southern margin of Junggar, and the subfacies of various facies types. The microfacies and sedimentary characteristics are studied in depth. Based on the study of high-resolution sequence stratigraphy of Permian outcrops in the southern margin and eastern margin of Junggar Basin, the identification criteria of different sequences are established. The short-term base-level cycles (five-grade sequences), the intermediate base-level cycles (quarter-order sequences) and the long-term base-level cycles (third-order sequences) of each profile are divided. The Permian in the southern margin of Junggar Basin is divided into 7 third-order sequences, and in the eastern margin of Junggar Basin, two third-order sequences. The Synthetical stratigraphic framework and sedimentary framework of the Permian system in the southern and eastern margin of Junggar Basin were established. Combined with the previous data, the sedimentary paleogeography map of the eastern Junggar Basin was compiled in the unit of epoch. The history of tectonic-sedimentary evolution in the eastern Junggar basin is discussed. It is considered that there are obvious differences in the sedimentary history of the Permian period between the southern margin of Junggar basin and the eastern margin of Junggar basin. First of all, the time when the mountains on both sides began to uplift was different. The southern margin was a residual basin in the early Permian, and the middle Permian sea water completely exited and evolved into a deep-water lake basin, which showed that the Bogda Mountains had not started to uplift at this time. The Calamari Mountains in the northeastern margin of Junggar Basin have been uplifted since the early Permian, resulting in the absence of early Permian strata in the eastern margin of the basin and the extensive development of coarse detrital deposits in the late braided fluvial braided river delta facies. Secondly, the rhythm of the Permian mountain uplift in the southern margin and the eastern margin is also different. The difference in the evolution history of the Bogda Mountains on the southern side of the basin and the Karamari Mountains on the north side of the basin is the filling sequence of the Permian sedimentary basins on both sides of the Junggar basin. The fundamental cause of the difference in lithology, lithofacies and sedimentary thickness.
【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;P539.2
【參考文獻】
相關(guān)期刊論文 前2條
1 李興平,李靜璉,王國司;準(zhǔn)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
2 邢煥清;;準(zhǔn)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
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