摘要
豫西前寒式纪汝阳群和洛峪群中广泛发育不同类型的风暴岩，主要包括丘状交错层砂岩、洼状交错层砂岩、浅水浊积岩以及与风暴作用有关的硬底、凝缩层和层间砾岩。不同类型风暴署具有不同的岩相组合及形成过程，并且发育在浅海陆棚的不同沉积带中。由洼伏交错层砂岩为主的相组合代表了滨岸带的下部；丘状交错层砂岩相组合指示风暴浪基面以上的内陆棚；而浅水浊积岩相组合则主要发育在外陆棚沉积区。这种风暴岩的沉积模式可用于详细恢复受风暴影响的古陆棚环境。
recambrian Ruyang and Luoyu Groups consist mainly of shelf and coastal deposits, Storm-influenced horizons or tempesttes are well developed in these groups.in particular, in Beidajian, Cuizhuang and Sanjiaotang Formations. This study deals with some typical tempesttes and storm-related sedimentary structures, includinghummocky cross-stratified sandstones, swaley cross-stratified sandstones, turbiditelike storm sandstones, thin intraformational pebbly conglomerates or pebbly sandstones, oolitic ironstones, glauconitic horizons (condensed layers) and hardgrounds.Different tempesttes have their distinct history of development. Facies of tempesttes and their associations can be used to reconstruct, in considerable details, depogitional zones within ancient coastal and shelf settings. The Cuizhuang and Sanjiaotang Formations form a typical sedimentary sequence which recorded evolutionaryprocesses from outer shelf to shoreline. The detailed environmental interpretation.of some intervals of the Ruyang and Luoyu Group are mainly based upon obserytions of tempesttes in addition to the consideration of other relevant factes.
出处
《地质科学》
CAS
CSCD
北大核心
1995年第3期240-246,T001,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
前寒武纪
汝阳群
洛峪群
风暴沉积
地层
Sotrm-influenced deposits, Hummocky cross-stratification, Swaley cross-stratification, Shallow-water turbidites, Condensed layers, Western Henan,Precambrian
