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Sedimentary dynamics and depositional model for mud accumulation in deep lake basins:A case study in the Upper Triassic Chang-7 Member,Ordos Basin,northern China
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作者 Wei Yu Feng Wang +4 位作者 Jing-Chun Tian Jiao Wang benjamin kneller Tian Yang Wei-Zhen Chen 《Journal of Palaeogeography》 SCIE CSCD 2024年第4期775-792,共18页
Shales in deep lake basins have become the main focus of continental shale oil and gas exploration.In order to highlight the sedimentary dynamics of mud deposition in deep lake basins,a combination of core observation... Shales in deep lake basins have become the main focus of continental shale oil and gas exploration.In order to highlight the sedimentary dynamics of mud deposition in deep lake basins,a combination of core observation,thin section examination,X-ray diffraction,and QEMSCAN(quantitative evaluation of minerals by scanning electron microscopy)was used to analyze the depositional characteristics of mudrocks in the Chang-7 Member from the Yanchang Formation(Upper Triassic)in Ordos Basin,and to establish a depositional model for mud accumulation in deep lake basins.This study recognizes four mudrock lithofacies in the Chang-7 Member:(1)the laminated silt-bearing mudstone,which generally develops a binary composition of“silt-clay”or a ternary composition of“silt-clay-organic matter”;(2)the graded mudstone,mainly composed of dark gray and gray-black mudstone sandwiched by silt-bearing mudstone;(3)the massive mudstone,internally showing a uniform distribution of quartz,clay,and carbonate minerals,with also a small amount of organic detritus;and(4)the laminated shale,which is generally composed of clay laminae,and organic laminae of the former two.Sediment supply,topographic slope,and flood intensity combine to control the evolution of gravity flows and the transport and deposition of the mudrock in the Chang-7 Member.The influence of orogeny provides terrain gradient,water depth,abundant sediments at source areas,and triggering mechanism for the formation of gravity flows.Floods triggered by wetting events provide the impetus for sediment transport.Mud deposition in the Chang-7 Member was mainly related to the transport and sedimentation of mud by hyperpycnal flows and rapid sedimentation by buoyant plume flocculation.A comprehensive evolutionary model for shale accumulation in the deep lake basin is established by integrating various triggering mechanisms and mud transport sedimentary processes. 展开更多
关键词 Mudrock Sedimentary dynamics mechanism Depositional model Chang-7 Member Depression lake basin
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