沉积学报2025，Vol.43Issue(1)：121-138,18.DOI:10.14027/j.issn.1000-0550.2023.007
鄂尔多斯盆地西北缘晚石炭世—中二叠世沉积背景特征与演化
Depositional Background and Evolution of Late Carboniferous-Middle Permian,Northwestern Margin of the Ordos Basin,China
摘要
Abstract
[Purpose]During the Late Carboniferous to Middle Permian at the northwestern margin of the Ordos Ba-sin,the sedimentary environment changed from marine to continental facies,accompanied by the advance and retreat of North China and Qilian seawaters.The spatial and temporal configuration and evolution of the sedimentary system are complex,and the understanding of paleogeographic pattern differences under diverse sedimentary backgrounds has been relatively limited.[Methods]Analysis of outcrop drilling logging data and micro-thin-section identification for main elements,trace elements and rare earth elements in more than 150 samples has clarified the sedimentary en-vironment and source area characteristics within the study area.The constraints of the sedimentary background on the paleogeographic reconstruction are also discussed.[Results]The northwestern margin of the Ordos Basin was generally warm and humid during the Late Carboniferous-Middle Permian.The water rapidly deepened and then re-mained at a relatively stable level during the period from the Yanghugou Formation to the Taiyuan Formation.The sedimentary period of the Taiyuan Formation shows a reducing background,with the transitional environment being dominated by salt water.For the Shihezi Formation within the Shanxi Formation,the sedimentary period indicates an oxidizing transitional environment dominated by fresh water.The provenance system from the Yanghugou Formation to the Shanxi Formation is complex,and the supply tended to be stable during the Shihezi Formation.[Conclusions]The paleo-geography of the study area differs from that to the north and south at different times.Mainly sand-poor sedimentary systems are evident in the south(e.g.,lagoon-tidal flat,bay-shallow water shelf and semi-deep water shelf),while predominantly sand-rich sedimentary systems of river-controlled and tidal deltas are developed in the north.With the closure of the paleo-Asian ocean and the transformation of the parent rock lithology in the provenance area,the delta system in the north continued to expand,and the water area in the south decreased sharply and developed into a bay/offshore lake.关键词
沉积环境/晚古生代/物源分析/鄂尔多斯盆地西北缘Key words
sedimentary environment/Late Paleozoic/provenance analysis/northwestern margin of Ordos Basin分类
天文与地球科学引用本文复制引用
张靖芪,刘磊,虎建玲,谢远飞,史云鹤,王志伟,朱淑玥,陈洪德,王峰,付斯一..鄂尔多斯盆地西北缘晚石炭世—中二叠世沉积背景特征与演化[J].沉积学报,2025,43(1):121-138,18.基金项目
国家自然科学基金项目(42102132) （42102132）
中石油长庆油田科研项目(2020-62503,2021-18099)[National Natural Science Foun-dation of China,No.42102132 （2020-62503,2021-18099）
CNPC Changqing Oilfield Funded Project,No.2020-62503,2021-18099] （）
