本文選題：中國東北 + 早石炭世��； 參考：《中國石油大學(xué)(華東)》2015年碩士論文

【摘要】：以中國東北地區(qū)11條實測剖面、21條觀察剖面和57條收集剖面為研究對象,并針對中國東北地區(qū)早石炭世地層劃分混亂、沉積環(huán)境研究程度較低的問題,通過剖面的巖石組合特征及元素地球化學(xué)特征分析,對中國東北地區(qū)早石炭世巖相古地理特征進行了研究。本次研究在中國東北地區(qū),共識別出碎屑巖、碳酸鹽巖、火山巖和火山碎屑巖四種巖石類型,碎屑巖主要為礫巖、砂巖、粉砂巖、泥巖和頁巖等,碳酸鹽主要為亮晶灰?guī)r、泥晶灰?guī)r和白云巖等,火山巖主要為玄武巖、安山巖等,火山碎屑巖主要為凝灰?guī)r;沉積構(gòu)造類型主要有水平層理、平行層理、透鏡狀層理、交錯層理和波狀層理等;通過剖面巖石樣品的元素地球化學(xué)特征分析,對中國東北地區(qū)早石炭世的沉積環(huán)境進行了研究,結(jié)果顯示,常量元素具有高Si、Fe,低P、Mn、K、和Na的特點,表明受陸源物質(zhì)影響較大;微量元素具有高V、Li、Sr、Zr,低Be、Ta、Th、Hf和U的特點,Sr/Ba、Th/U、V/Cr、V/(V+N i)等判別參數(shù)說明其為海相還原環(huán)境;輕、重稀土元素分異顯著,輕稀土較為富集,Ce正異常是稀土元素的特點。根據(jù)剖面巖性組合特征、沉積構(gòu)造,并結(jié)合元素地球化學(xué)特征,對中國東北地區(qū)早石炭世的沉積體系進行了研究,共識別出主要有陸地邊緣沉積體系、淺海陸棚沉積體系、臺地沉積體系和三角洲沉積體系四種沉積體系,發(fā)育的亞相類型有瀉湖、后濱、前濱、開闊臺地、局限臺地、三角洲前緣和扇三角洲。通過野外實測剖面與區(qū)域地層資料的結(jié)合,選取地層發(fā)育相對齊全的剖面,統(tǒng)計地層厚度、砂泥巖厚度,并編制地層厚度圖、泥巖厚度圖、砂巖厚度圖、泥地比圖、砂地比圖、巖相分類三角圖,確定發(fā)育北部、南部和東部三個物源體系。依據(jù)優(yōu)勢巖相及沉積相的原則,結(jié)合剖面相分析,對早石炭世的巖相古地理特征進行了研究,結(jié)果顯示,中國東北地區(qū)早石炭世主體為海相,主要發(fā)育三角洲相、碳酸鹽巖臺地相和淺海相,其中三角洲相主要發(fā)育在吉林中部地區(qū)和研究區(qū)的西部地區(qū),碳酸鹽巖臺地相主要發(fā)育在內(nèi)蒙古東北部地區(qū),淺海相在研究區(qū)廣泛發(fā)育。
[Abstract]:In this paper, 21 observation sections and 57 collection sections of 11 observed sections in Northeast China are taken as the research objects, and aiming at the problem of the stratigraphic division of the early Carboniferous in Northeast China is chaotic and the study degree of sedimentary environment is relatively low. The characteristics of early Carboniferous lithofacies and paleogeography in northeast China were studied by analyzing the characteristics of rock assemblage and element geochemistry of the section. In this study, four rock types, clastic rock, carbonate rock, volcanic rock and pyroclastic rock, were identified in northeast China. The clastic rocks are mainly conglomerate, sandstone, siltstone, mudstone and shale, while carbonate is mainly lime-rock. The main types of sedimentary structure include horizontal bedding, parallel bedding, lenticular bedding, staggered bedding and wave-like bedding, etc., volcanic rocks are mainly basalt, andesite, pyroclastic rocks are mainly tuff, and sedimentary structural types are mainly horizontal bedding, parallel bedding, lenticular bedding, interlaced bedding and wave-like bedding, etc. The sedimentary environment of the early Carboniferous in northeast China was studied by analyzing the geochemical characteristics of the rock samples in the section. The results showed that the major elements had the characteristics of high Si-Fe, low Pb-MnK, and Na, which indicated that they were greatly influenced by land-based materials. The trace elements have the characteristics of high V Li Li Sr Si Zr, low B E T T T H f and U etc. The discriminant parameters such as Sr / Baer T / U V / V / V / V Ni) indicate that the trace elements are marine reduction environment, and the light and heavy rare earth elements are distinguished significantly, and the positive anomalies of ce enrichment are the characteristics of rare earth elements. According to the characteristics of lithologic assemblage, sedimentary structure and elemental geochemistry, the sedimentary system of early Carboniferous in northeast China is studied. The main sedimentary systems of the early Carboniferous in Northeast China are the terrestrial margin sedimentary system and the shallow sea shelf sedimentary system. There are four sedimentary systems of platform sedimentary system and delta sedimentary system. The subfacies types are lagoon, backshore, foreshore, open platform, limited platform, delta front and fan delta. Based on the combination of the field measured section and the regional stratigraphic data, the relatively complete stratigraphic sections are selected to calculate the formation thickness, sand and mudstone thickness, and to compile the formation thickness map, mudstone thickness map, sandstone thickness map, mud to ground ratio map, sand to ground ratio map. Triangulation of lithofacies to determine the development of the north, south and east of the three provenance systems. According to the principle of dominant lithofacies and sedimentary facies, combined with the analysis of the sectional facies, the lithofacies and paleogeographic characteristics of the early Carboniferous are studied. The results show that the main body of the early Carboniferous in Northeast China is marine facies, and the delta facies is mainly developed. The carbonate platform facies and shallow sea facies, among which the delta facies mainly developed in the central Jilin region and the western part of the study area, the carbonate platform facies mainly developed in the northeast of Inner Mongolia, and the shallow sea facies developed extensively in the study area.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.13;P534.45

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