贵州大方地区中—晚三叠世地层划分对比及沉积相分析
发布时间：2018-11-25 15:29
【摘要】：本文通过对贵州大方地区野外踏勘及室内资料整理与分析,结合测制野外实测地层剖面得到的沉积构造、岩石组合特征、生物化石等资料,参考前人已得的数据资料,对研究区内的地层进行综合分析,将地层做了划分。并且分析总结了研究区内中-晚三叠世的沉积相,得出研究区中-晚三叠世的沉积相模式。以下为实测剖面:A-贵州省大方县高枧乡岔河关岭组-二桥组实测地层剖面、B-贵州省响水乡菁口杨柳井组-二桥组实测地层剖面、C-贵州省大方县羊场镇高家庄关岭组实测地层剖面、D-贵州省黔西县沙窝乡关岭组实剖面、E-贵州省黔西县五里乡芝坝中杨柳井组-改茶组实测地层剖面。根据剖面的资料和研究成果,得出研究区内地层的岩性、岩石组合等特征,结合上述研究成果将研究区岩石地层划分为关岭组(狮子山段、松子坎段)、杨柳井组、改茶组和二桥组。根据研究区内地层中所含古生物的化石种类、特征、出露层位等,在贵州大方地区建立了两个双壳化石组合带。分别为双壳Myophria(Costatoria)goldfussi-Halobia rugosoides组合带、双壳Indosinion—Permophorus组合带。研究区内生物化石种类以及含量并不是特别丰富,本文根据已有化石特征再结合前人的数据资料,进行年代地层划分。研究区内关岭组与杨柳井组对应年代地层的中三叠统,分别与安尼阶下部及上部相当;改茶组归于中三叠统,大致与拉丁阶中下部相当;而二桥组的年代地层归于上三叠统瑞替阶。根据研究区内地层划分对比和沉积构造分析研究,对研究区内进行沉积相分析。贵州大方地区中-上三叠统地层可以划分为两类:碳酸盐台地相和河流相。研究区内的碳酸盐台地沉积相可以细分为局限台地亚相、开阔台地亚相、蒸发台地亚相和浅滩亚相。河流沉积相可以划分为辫状河亚相和曲流河亚相。根据研究区内中-上三叠统沉积相研究所得成果,进一步分析并创建了贵州大方地区中-晚三叠世沉积相模式,并总结得出研究区的沉积相模式图。根据以上工作进一步总结分析得出三叠纪时期大方地区的古地理演化:研究区属于贵州海盆,其位于西南海盆中心,是一个半封闭的环境。研究区内中三叠世早期为快速海侵形成开阔的浅海,中期则变成由海退形成的半封闭内陆海,直到中期结束研究区内都为海相沉积。然而到晚期时,研究区内海水全部撤出,从而形成陆相沉积。
[Abstract]:In this paper, based on the field survey and indoor data analysis in Dangxiang, Guizhou, combined with the sedimentary structure, rock assemblage characteristics, biological fossils and other data obtained from the stratigraphic profiles measured in the field, this paper refers to the data obtained by the predecessors. The stratigraphy in the study area is analyzed synthetically, and the stratigraphy is divided. The sedimentary facies of the Middle-Late Triassic in the study area are analyzed and summarized, and the sedimentary facies model of the Middle-Late Triassic in the study area is obtained. The following are the measured sections: the actual formation profile of the Gaozhang River Guanling formation and Erqiao formation in Gaozhou-Erqiao formation, Dafang County, Guizhou Province, and the formation profile of the Yangliujing formation and Erqiao formation in Xiangshuixiang, Xianghiankou, Guizhou Province, B- Guizhou Province. The measured stratigraphic profile of Yangchang Town, Gajiazhuang Guanling formation, D- Guizhou Qianxi County Shawo Xiang Guanling formation, E- Guizhou Province Qianxi County, Guizhou Province, the Yangliujing formation in the middle of the Yangliujing formation to the tea formation is measured. According to the data of the section and the research results, the lithology and rock assemblage of the strata in the study area are obtained. Combined with the above research results, the lithostratigraphy of the study area is divided into Guanling formation (Shizishan formation, Songzikan formation), Yangliujing formation, Change tea group and Erqiao group. According to the fossil species, characteristics and outcrop position of paleontology in the strata of the study area, two bivalve fossil assemblages have been established in Dangang area, Guizhou Province. It is a double shell Myophria (Costatoria) goldfussi-Halobia rugosoides composite band and a double shell Indosinion-Permophorus composite band respectively. The species and contents of fossils are not particularly abundant in the study area. In this paper, the chronostratigraphic classification is carried out according to the characteristics of the existing fossils and the previous data. The middle Triassic corresponding to Yangliujing formation and Guanling formation in the study area is equivalent to the lower and upper part of the Ani rank respectively, and the modified tea formation belongs to the middle Triassic, which is roughly equivalent to the middle and lower part of the Latin rank. The chronostratigraphy of Erqiao formation belongs to the upper Triassic RET order. According to stratigraphic division and correlation and sedimentary structure analysis in the study area, sedimentary facies in the study area are analyzed. The Middle-Upper Triassic strata in the Dangang area of Guizhou can be divided into two types: carbonate platform facies and fluvial facies. The carbonate platform sedimentary facies in the study area can be subdivided into limited platform subfacies, open platform subfacies, evaporation platform subfacies and shoal subfacies. The fluvial sedimentary facies can be divided into braided river subfacies and meandering river subfacies. Based on the results of the study on the sedimentary facies of the Middle-Upper Triassic in the study area, the sedimentary facies model of the Middle-Late Triassic in the Dangang area of Guizhou Province was further analyzed and established, and the sedimentary facies model map of the study area was summarized. According to the above work, the paleogeographic evolution of Dangang area during the Triassic period is concluded: the study area belongs to the Guizhou basin, which is located in the center of the southwest sea basin and is a semi-closed environment. In the study area, the early Middle Triassic formed open shallow sea by rapid transgression, and in the middle period it became a semi-enclosed inland sea formed by regression, until the end of the study area, all of them were marine deposits. However, by the late stage, the sea water in the study area was completely withdrawn, thus forming continental deposits.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P534.51
[Abstract]:In this paper, based on the field survey and indoor data analysis in Dangxiang, Guizhou, combined with the sedimentary structure, rock assemblage characteristics, biological fossils and other data obtained from the stratigraphic profiles measured in the field, this paper refers to the data obtained by the predecessors. The stratigraphy in the study area is analyzed synthetically, and the stratigraphy is divided. The sedimentary facies of the Middle-Late Triassic in the study area are analyzed and summarized, and the sedimentary facies model of the Middle-Late Triassic in the study area is obtained. The following are the measured sections: the actual formation profile of the Gaozhang River Guanling formation and Erqiao formation in Gaozhou-Erqiao formation, Dafang County, Guizhou Province, and the formation profile of the Yangliujing formation and Erqiao formation in Xiangshuixiang, Xianghiankou, Guizhou Province, B- Guizhou Province. The measured stratigraphic profile of Yangchang Town, Gajiazhuang Guanling formation, D- Guizhou Qianxi County Shawo Xiang Guanling formation, E- Guizhou Province Qianxi County, Guizhou Province, the Yangliujing formation in the middle of the Yangliujing formation to the tea formation is measured. According to the data of the section and the research results, the lithology and rock assemblage of the strata in the study area are obtained. Combined with the above research results, the lithostratigraphy of the study area is divided into Guanling formation (Shizishan formation, Songzikan formation), Yangliujing formation, Change tea group and Erqiao group. According to the fossil species, characteristics and outcrop position of paleontology in the strata of the study area, two bivalve fossil assemblages have been established in Dangang area, Guizhou Province. It is a double shell Myophria (Costatoria) goldfussi-Halobia rugosoides composite band and a double shell Indosinion-Permophorus composite band respectively. The species and contents of fossils are not particularly abundant in the study area. In this paper, the chronostratigraphic classification is carried out according to the characteristics of the existing fossils and the previous data. The middle Triassic corresponding to Yangliujing formation and Guanling formation in the study area is equivalent to the lower and upper part of the Ani rank respectively, and the modified tea formation belongs to the middle Triassic, which is roughly equivalent to the middle and lower part of the Latin rank. The chronostratigraphy of Erqiao formation belongs to the upper Triassic RET order. According to stratigraphic division and correlation and sedimentary structure analysis in the study area, sedimentary facies in the study area are analyzed. The Middle-Upper Triassic strata in the Dangang area of Guizhou can be divided into two types: carbonate platform facies and fluvial facies. The carbonate platform sedimentary facies in the study area can be subdivided into limited platform subfacies, open platform subfacies, evaporation platform subfacies and shoal subfacies. The fluvial sedimentary facies can be divided into braided river subfacies and meandering river subfacies. Based on the results of the study on the sedimentary facies of the Middle-Upper Triassic in the study area, the sedimentary facies model of the Middle-Late Triassic in the Dangang area of Guizhou Province was further analyzed and established, and the sedimentary facies model map of the study area was summarized. According to the above work, the paleogeographic evolution of Dangang area during the Triassic period is concluded: the study area belongs to the Guizhou basin, which is located in the center of the southwest sea basin and is a semi-closed environment. In the study area, the early Middle Triassic formed open shallow sea by rapid transgression, and in the middle period it became a semi-enclosed inland sea formed by regression, until the end of the study area, all of them were marine deposits. However, by the late stage, the sea water in the study area was completely withdrawn, thus forming continental deposits.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P534.51
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