内蒙古额济纳旗拐子湖地区二叠纪地层研究
发布时间：2018-12-13 12:55
【摘要】：本论文在岩石学、沉积学、地层学等学科理论指导下,通过收集和研究前人资料的基础上,通过野外地质调查、测试分析资料和室内综合研究分析等手段,以内蒙古额济纳旗拐子湖一带二叠纪地层、及古生物等特征研究为基础,开展了二叠系地层划分和厘定、地层层序及沉积相特征的研究。拐子湖西北角的原二叠系双堡塘组,依据岩石组合特征区域对比,在原二叠系双堡塘组底部识别出一套变质岩系,变质程度高的片麻岩系划归下元古界北山群,其浅变质岩系划分归中元古界长城系古硐井群。岩石学研究表明,区内该套地层岩石类型主要为碎屑岩,根据岩石组合特征区域对比和北邻区古生物组合,将原二叠系双堡塘组上部未变质的碎屑岩组合划分为二叠系双堡塘组,其时代为早二叠世。以二叠系双堡塘组为研究对象,对研究区进行二叠系双堡塘组露头层序地层学研究,将区内划分为1个二级层序和3个三级层序,并对各基本层序、各级层序、体系域及准层序特征进行了总结。初步划分出1个准层序类型,为自下而上由细变粗准层序。体系域类型分别为低位体系域、海侵体系域和高位体系域。根据岩石特征、沉积构造、古生物标志及微量元素等标志,将研究区二叠系双堡塘组沉积环境划分为浅海环境和无障壁海岸环境。并进一步划分了四个亚相类型,分别为前滨亚相、近滨亚相、过渡带亚相和滨外陆棚亚相。
[Abstract]:Under the guidance of petrology, sedimentology, stratigraphy and other disciplines, based on the collection and study of previous data, this paper adopts the methods of field geological survey, test and analysis data and indoor comprehensive research and analysis. Based on the study of Permian strata and paleontology in the area of Guizi Lake in Ejina Banner, Inner Mongolia, the stratigraphic division and determination, stratigraphic sequence and sedimentary facies characteristics of Permian have been studied. According to the regional correlation of the characteristics of the Permian rocks, a set of metamorphic rock series was identified at the bottom of the original Permian Shuangbaotang formation in the northwest corner of Guizi Lake. The gneiss series with high metamorphism was classified into the Lower Proterozoic Beishan Group. Its shallow metamorphic rock series is divided into the Middle Proterozoic the Great Wall ancient well group. The petrological study shows that the rock types in this area are mainly clastic rocks. According to the regional correlation of rock assemblages and the paleontological assemblages in the north adjacent area, The unmetamorphosed clastic rock assemblages of the upper part of the original Permian Shuangbaotang formation are divided into the Permian Shuangbaotang formation at an early Permian age. Taking the Shuangbaotang formation of Permian system as the research object, the outcrop sequence stratigraphy of the Shuangbaotang formation of the Permian system is studied. System tracts and quasi-sequence characteristics are summarized. One type of quasequence is preliminarily divided, which is from fine to coarse from bottom to top. The types of system tracts are low system tracts, transgressive system tracts and high system tracts. According to the characteristics of rocks, sedimentary structures, paleobiological markers and trace elements, the sedimentary environment of the Permian Shuangbaotang formation in the study area is divided into shallow sea environment and non-barrier coastal environment. Four subfacies are further divided, namely, foreshore subfacies, proximal subfacies, transitional zone subfacies and off-shore shelf subfacies.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P534.46
本文编号：2376564
[Abstract]:Under the guidance of petrology, sedimentology, stratigraphy and other disciplines, based on the collection and study of previous data, this paper adopts the methods of field geological survey, test and analysis data and indoor comprehensive research and analysis. Based on the study of Permian strata and paleontology in the area of Guizi Lake in Ejina Banner, Inner Mongolia, the stratigraphic division and determination, stratigraphic sequence and sedimentary facies characteristics of Permian have been studied. According to the regional correlation of the characteristics of the Permian rocks, a set of metamorphic rock series was identified at the bottom of the original Permian Shuangbaotang formation in the northwest corner of Guizi Lake. The gneiss series with high metamorphism was classified into the Lower Proterozoic Beishan Group. Its shallow metamorphic rock series is divided into the Middle Proterozoic the Great Wall ancient well group. The petrological study shows that the rock types in this area are mainly clastic rocks. According to the regional correlation of rock assemblages and the paleontological assemblages in the north adjacent area, The unmetamorphosed clastic rock assemblages of the upper part of the original Permian Shuangbaotang formation are divided into the Permian Shuangbaotang formation at an early Permian age. Taking the Shuangbaotang formation of Permian system as the research object, the outcrop sequence stratigraphy of the Shuangbaotang formation of the Permian system is studied. System tracts and quasi-sequence characteristics are summarized. One type of quasequence is preliminarily divided, which is from fine to coarse from bottom to top. The types of system tracts are low system tracts, transgressive system tracts and high system tracts. According to the characteristics of rocks, sedimentary structures, paleobiological markers and trace elements, the sedimentary environment of the Permian Shuangbaotang formation in the study area is divided into shallow sea environment and non-barrier coastal environment. Four subfacies are further divided, namely, foreshore subfacies, proximal subfacies, transitional zone subfacies and off-shore shelf subfacies.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P534.46
【相似文献】
相关期刊论文 前3条
1 杨帅师,陈志勇,康小龙,李新仁,许立权,贺锋,巩智镇;内蒙古西部北山地区中、上二叠统双堡塘组地层古生物特征[J];地质通报;2005年03期
2 王静永;甘肃走廊北山峡东地区双堡塘组软沉积构造及其地质意义[J];甘肃地质学报;2004年01期
3 ;[J];;年期
相关硕士学位论文 前1条
1 范模春;内蒙古额济纳旗拐子湖地区二叠纪地层研究[D];长安大学;2015年
，本文编号：2376564
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2376564.html
