本文選題：汝陽盆地 + 蟒川組��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：豫西汝陽盆地位于華北板塊南緣和秦嶺造山帶接壤地帶,其在中三疊世到晚侏羅世處于隆升,接受剝蝕,早白堊世形成火山盆地,沉積大營組,晚白堊世—古新世形成斷坳陷盆地,沉積了蟒川組。本文在研究區(qū)地質(zhì)概況的背景下,對(duì)三條蟒川組地層剖面進(jìn)行詳細(xì)的分層描述,查明了各組的巖性特征,地層厚度以及接觸關(guān)系。在對(duì)實(shí)測剖面古生物化石的鑒定分析的基礎(chǔ)上根據(jù)其組合特征,劃立了Polypodiaceae Castanea Betulaceae孢粉組合帶,Quercus Graminae Chenopodiaceae孢粉組合帶,Pinus Quercus-Castanea孢粉組合帶,以及Castanea-Ulmus-Artemisia孢粉組合帶四個(gè)孢粉組合帶。并通過對(duì)孢粉資料的定量分析完成了古氣候、古環(huán)境的重建�？傮w得出整體顯示亞熱帶-溫帶氣候條件下半干旱的生長環(huán)境,其氣溫先變冷后變暖,降水逐漸稀少,氣候逐漸干旱,湖泊面積逐漸縮小的結(jié)論。通過對(duì)研究區(qū)蟒川組地層進(jìn)行了沉積環(huán)境分析,認(rèn)識(shí)到蟒川組主要為一套湖泊沉積,間有辮狀河及曲流河沉積,并通過其沉積特征以恢復(fù)沉積相及沉積亞相,并對(duì)其沉積亞相進(jìn)行了簡單分析。總體沉積環(huán)境顯示半干旱氣候下的辮狀河流-曲流河-湖泊三角洲-湖泊的沉積特點(diǎn)。對(duì)研究區(qū)晚白堊世—古新世盆地的沉積環(huán)境進(jìn)行了分析研究,初步新建研究區(qū)的盆地演化模式。該地區(qū)前人多認(rèn)為為坳陷盆地,本次研究發(fā)現(xiàn)為南西側(cè)坳陷,北東側(cè)斷陷的箕形盆地,其沉積中心自南西向北東遷移,盆地演化不同地段不同,在北部高山區(qū),坳陷邊到斷陷邊,從洪積—洪沖積到湖積,邊緣洪積;中山區(qū)從坡洪積—洪沖積—湖積;低山丘陵地帶為洪沖積—洪積的沉積模式。從構(gòu)造演化、物源供給、古氣候特征方面分析影響盆地發(fā)展演化的因素,認(rèn)為構(gòu)造因素在沉積相的控制上起著決定性作用,但氣候和沉積物供應(yīng)量的多少也對(duì)凹陷的充填構(gòu)成重要影響。本次研究在調(diào)查區(qū)獲得北部莽川一帶下部71.4±7.0Ma、上部54.8±5.0Ma、中南部大營西一帶下部66.8±6.0Ma,上部54.2±5.0Ma和南緣石龍區(qū)東一帶70.1±7.0Ma的ESR年齡,發(fā)現(xiàn)下部晚白堊世的年齡信息,為莽川組進(jìn)行了進(jìn)一步厘定,初步確定其地層時(shí)代并與發(fā)現(xiàn)恐龍化石劉店一帶地層對(duì)比及中新生代盆地演化提供非常重要資料,這些成果為研究該區(qū)域新構(gòu)造運(yùn)動(dòng)研究提供了新的資料。
[Abstract]:The Ruyang basin in western Henan is located in the southern margin of the North China plate and the contiguous zone of the Qinling orogenic belt. It was uplifted from the Middle Triassic to the late Jurassic, accepted denudation, formed a volcanic basin in the early Cretaceous, and formed a sedimentary Daying formation. The late Cretaceous-Paleocene formed a fault depression basin and deposited the pyengchuan formation. In this paper, the stratigraphic profile of three pyengchuan formation is described in detail under the background of geological survey in the study area, and the lithologic characteristics, formation thickness and contact relationship of each group are found out. Based on the identification and analysis of the paleontological fossils in the measured section, four sporopollen assemblages of the Polypodiaceae Castanea and Betulaceae sporopollen assemblages, Quercus and Graminae Chenopodiaceae sporopollen assemblages, and Castanea-Ulmus-Artemisia sporopollen assemblages have been established, on the basis of the identification and analysis of the paleontological fossils in the measured sections, and four sporopollen assemblages in the Castanea-Ulmus-Artemisia sporopollen assemblage belt. The paleoclimate and paleoenvironment were reconstructed by quantitative analysis of sporopollen data. It is concluded that the semi-arid growing environment in the subtropical temperate climate shows that the temperature first becomes cold and then warms, the precipitation becomes scarce, the climate gradually dries, and the lake area shrinks gradually. Based on the analysis of sedimentary environment of the strata of the Xianchuan formation in the study area, it is recognized that the formation is mainly composed of a set of lake deposits with braided rivers and meandering rivers, and the sedimentary facies and sedimentary subfacies can be restored by their sedimentary characteristics. The sedimentary subfacies were analyzed briefly. The overall sedimentary environment shows the sedimentary characteristics of braided rivers, meandering rivers, lake deltas and lakes in semiarid climate. The sedimentary environment of the late Cretaceous to Paleocene basins in the study area was analyzed and the evolution model of the basin was preliminarily established. Most of the former people in this area considered the basin as a depression basin. In this study, we found that the basin is a dustpan basin with the south west depression and the north east fault depression. The sedimentary center of the basin moves from south to west to north east, and the basin evolves in different areas, in the northern alpine region. From the margin of depression to the edge of fault depression, from alluvial to lacustrine, marginal alluvial; from slope to alluvial to lacustrine; from slope to alluvial to lacustrine in middle mountain area; from low hill to hilly area, to the sedimentary model of flood alluvial and alluvial. The factors affecting the evolution of the basin are analyzed in terms of tectonic evolution, provenance and paleoclimate characteristics. It is considered that tectonic factors play a decisive role in the control of sedimentary facies. However, the amount of climate and sediment supply also plays an important role in the filling of the sag. The ESR ages of 71.4 鹵7.0 Ma, 54.8 鹵5.0 Ma, 66.8 鹵6.0 Ma, 54.2 鹵5.0 Ma, 54.2 鹵5.0 Ma and 70.1 鹵7.0 Ma in the lower part of Mangchuan area, the upper part, the west part of the central and southern part of Daying, and the east part of the Shilong district in the southern margin, respectively, were obtained in this study. The age information of the lower part of the late Cretaceous was found. It provides very important data for the further determination of the Mengchuan formation, the preliminary determination of its stratigraphic age and the stratigraphic correlation and evolution of the Meso-Cenozoic basin in the area of the discovery of the dinosaur fossil Liudian. These results provide new data for the study of neotectonic movement in the region.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q914

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