古地理学报2018，Vol.20Issue(2)：231-243,13.DOI:10.7605/gdlxb.2018.02.017
鄂尔多斯盆地东缘保德地区上古生界层序地层与沉积相特征
Characteristics of sequence stratigraphy and sedimentary facies of the Upper Paleozoic in Baode area, eastern margin of Ordos Basin
摘要
Abstract
In order to reveal the characteristics of sequence stratigraphy and sedimentary facies of the east margin of Ordos Basin,based on theories of sequence stratigraphy and sedimentology,the sequence and system tract boundary types,sequence structure,sedimentary facies types and sedimentary evolution of the Upper Paleozoic in the Palougou section of Baode area and peripheral sections in eastern margin of Ordos Basin were analysed.According to the several sequence boundaries such as regional unconformity surface,incised valley erosional surface,transgressive direction conversion surface and regional regression surface,the Upper Paleozoic in study area was divided into 7 third-order sequences,corresponding to Benxi Formation,the Second Member of Taiyuan Formation,the First Member of Taiyuan Formation,Shanxi Formation,Xiashihezi Formation,Shangshihezi Formation and Shiqianfeng Formation,respectively.The Palougou and peripheral Upper Paleozoic sections developed 16 rock types and 8 rock association types. The Upper Paleozoic developed barrier coast facies,carbonate platform facies,braided river facies and meandering river facies in the Palougou and peripheral sections.In SQ1-SQ3,the lowstand systems tract developed weathering crust and tidal channel subfacies,the transgressive systems tract developed tidal flat subfacies and lagoon subfacies,the highstand systems tract developed platform facies,lagoon subfacies and flat subfacies.In SQ4-SQ7,the lowstand systems tract developed braided river bed subfacies,the transgressive systems tract developed meandering river floodplain subfacies,the highstand systems tract developed multi-period evolutionary series of meandering river,including river bed subfacies,rive bank subfacies and floodplain subfacies.The sedimentary facies of the Upper Paleozoic in study area shifted from barrier coast facies,carbonate platform facies to fluvial facies,which was mainly affected by provenance supply,sea-level change and tectonic activity.关键词
鄂尔多斯盆地/保德地区/上古生界/层序界面/层序结构/沉积相/沉积演化Key words
Ordos Basin/Baode area/Upper Paleozoic/sequence boundary/sequence structure/sedimentary facies/sedimentary evolution分类
天文与地球科学引用本文复制引用
侯中帅,陈世悦,王越,李天宝,赫庆庆,崔绮梦..鄂尔多斯盆地东缘保德地区上古生界层序地层与沉积相特征[J].古地理学报,2018,20(2):231-243,13.基金项目
国家科技重大专项(编号:2016ZX05006-007)资助.Financially supported by the National Science and Technology Major Project of China (No.2016ZX05006-007) （编号:2016ZX05006-007）
