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约代尔旋回形成机制之我见——以华北克拉通晚古生代煤系沉积为例
投稿时间:2020-12-01  修订日期:2021-08-05  点此下载全文
引用本文:石彦强.2021.约代尔旋回形成机制之我见——以华北克拉通晚古生代煤系沉积为例[J].地质论评,67(5):1197-1206,[DOI]:.
SHI Yanqiang.2021.My view on the formation mechanism of the Yoredale cycle——A case study of Late Paleozoic coal formation deposits in the North China Craton[J].Geological Review,67(5):1197-1206.
DOI:10.16509/j.georeview.2021.08.013
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作者单位E-mail
石彦强 北京大地高科地质勘查有限公司北京 100040 shxshyq@126.com 
中文摘要:“约代尔”旋回是由石灰岩、煤层和陆源碎屑岩组成的,以煤层顶板与海相灰岩直接沉积接触为特征的旋回。就此旋回,以往研究给出了截然不同的多种成因认识。为了探寻旋回的真正形成机制,将地史聚煤期沉积特征与现代植被、泥炭沼泽、碳酸盐岩沉积规律相对比分析,认为地史聚煤期植物异常繁盛,占据了盆地演化阶段的主导地位。在先遣植被的禁锢下,盆地输入陆源碎屑极其贫乏,形成动态泥炭沼泽;泥炭沼泽覆水后,很浅的水体也非常清澈,水生生物与已沉积有机质共同作用,以及随后的成岩胶结促进了石灰岩的形成。煤层顶部至石灰岩下部代表的是无碎屑输入的滨海,水深逐渐增加的沉积序列,石灰岩与下伏煤层为连续沉积。约代尔旋回是先遣植被限制了陆源碎屑输入,导致海水清澈的、正常的海进海退沉积。石灰岩和煤层虽然厚度不是很大,但横向连续性相当好,向陆源方向煤层增厚、石灰岩变薄,向海方向煤层变薄、石灰岩增厚,约代尔旋回向陆可以形成厚煤层。约代尔旋回真相的揭示,为沉积古地理和层序地层研究,以及为准确的区域对比、探索聚煤规律奠定了坚实的基础。
中文关键词:约代尔旋回  先遣植被  动态泥炭沼泽  陆源碎屑  动态聚煤模式  碳酸盐岩沉积  华北克拉通
 
My view on the formation mechanism of the Yoredale cycle——A case study of Late Paleozoic coal formation deposits in the North China Craton
NameInstitution
SHI YanqiangBeijing Dadigaoke Geological Exploration Co.Ltd.,Beijing,100040
Abstract:Yoredale cycle,including limestone,coal seam and terrigenous clastic rock,is characterized by direct sedimentary contact between coal seam roof and marine limestone.Previous studies have given several completely different causes for this cycle.In order to explore the real formation mechanism of the cycle,the sedimentary characteristics of coal accumulation period in geological history are compared with the sedimentary regularities of modern vegetation, peat—swamp and carbonate rock.The analysis results show that the plants were extremely prosperous in the coal accumulation period of geological history,and dominated the basin evolution stage.Under the confinement of advance vegetation,extremely less terrigenous debris input into the basin,forming a dynamic peat—swamp.After the peat—swamp is covered by water,even shallow water is very clear.The formation of limestone is promoted by the interaction of aquatic organisms with the deposited organic matter,and the subsequent diagenesis cementation.From the top of the coal seam to the bottom of the limestone,it represents the littoral without detrital input, forming a sedimentary sequence with gradually increasing water depth.Limestone and underlying coal seam are continuous deposition.The formation of Yoredale cycle is due to the limitation of terrigenous clastic input by advance vegetation,which leads to clear and normal transgressive and regressive sediments.Although the thickness of limestone and coal seam is not very large,the lateral continuity is good.The coal seam thickens and the limestone thins in the direction of terrigenous source,while the coal seam thins and the limestone thickens in the direction of sea.Thick coal seam can be formed in the continental direction of the Yoredale cycle.The discovery of the truth of Yoredale cycle has laid a solid foundation for the study of sedimentary paleogeography and sequence stratigraphy,as well as accurate regional correlation and exploration of coal accumulation regularity.
keywords:Yoredale cycle  advance vegetation  dynamic peat—swamp  terrigenous detritus  dynamic coal accumulation model  carbonate deposition  North China Craton
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