沉积学报2025，Vol.43Issue(5)：1605-1624,20.DOI:10.14027/j.issn.1000-0550.2025.036
鄂尔多斯盆地北部及周缘二叠纪源—汇过程与古地理重建
Permian Source-to-Sink Processes and Paleogeographic Reconstruction in the Northern Ordos Basin and Its Periphery
摘要
Abstract
[Objective]The Permian represents a critical period of tectonic-sedimentary transition in the northern Or-dos Basin.A detailed characterization of its complex source-to-sink processes is essential for revealing multi-provenance differential supply patterns and paleogeographic evolution.[Methods]This study systematically analyzes provenance signals and sedimentary filling processes in the northern Ordos Basin using outcrop observations,well-logging data and detrital zircon U-Pb geochronology,aiming to clarify the paleogeographic framework constrained by source-to-sink systems and its implications for the closure of the Paleo-Asian Ocean.[Results](1)Detrital zircon U-Pb ages reveal that the Alxa Block,Xing-Meng Orogenic Belt and the North China Craton contributed differently during the Permian,with marked east-west variations.The northern basin was divided by multidimensional scaling(MDS)into three provenance zones:Alxa;western Yinshan;and eastern Yinshan.(2)The Permian depositional systems evolved from tide-dominated deltas to braided-river deltas,with sediment thickness and sandbody distribu-tion having a'thicker in the west and stronger in the north'pattern.Provenance supply intensity is closely correlated to environmental changes.Enhanced lateral continuity of sandbodies in the Shanxi and Shihezi Formations reflects braided channel development associated with strong sediment supply.(3)Source-to-sink analysis indicates that(i)the Taiyuan Stage was dominated by proximal weak supply;(ii)the Shanxi Stage shows increased provenance mixing,which formed an east-west differentiated depositional pattern;and(iii)the Shihezi Stage shows that a signifi-cant uplift of the North China Craton basement led to dominant distal supply,with maximum sandbody thickness and spatial extent.[Conclusions]The inhomogeneity of the subduction/closure of the Paleo-Asian Ocean drove the'strong in the west and weak in the east'differential uplift in the Xing'an-Mongolian Orogenic Belt and the'strong in the east and weak in the west'basement of the North China Craton.This controlled the east-west differentiation pattern and evolution of the provenance in the northern part of the basin,indicated by mixed provenance in the west and cratonic basement in the east.The sedimentary system was transformed from a tide-dominated delta in the Taiyuan Stage marine-continental transitional environment to a continental braided river delta in the Shihezi Stage.[Significance]The established paleogeographic evolution model,based on source-to-sink processes,provides a dynamic coupling framework for understanding multi-provenance sedimentation responses and hydrocarbon explora-tion in large cratonic basins.关键词
碎屑锆石/物源分析/鄂尔多斯盆地北部/古地理格局/二叠系Key words
detrital zircon/provenance analysis/northern Ordos Basin/paleogeographic framework/Permian分类
天文与地球科学引用本文复制引用
张成弓,陈洪德,刘磊,王志伟,李丹,王译羚,马贤成,唐文燕,赵俊兴,王峰..鄂尔多斯盆地北部及周缘二叠纪源—汇过程与古地理重建[J].沉积学报,2025,43(5):1605-1624,20.基金项目
新型油气勘探开发国家科技重大专项(2025ZD1400201)National Science and Technology Major Project on New Petroleum and Gas Exploration and Development,No.2025ZD1400201 （2025ZD1400201）
