Facies Development and Paleoecologic Zonation of Four Upper Triassic Patch Reefs Northern Calcareous Alps Near Salzburg Austria
Facies Development and Paleoecologic Zonation of Four Upper Triassic Patch Reefs Northern Calcareous Alps Near Salzburg Austria
复制标题
奥地利萨尔茨堡附近四个上三叠世斑块礁的相发育和古生态分区
DOI：
10.2110/pec.81.30.0241
复制
发表时间：
1981
期刊：
影响因子：
--
通讯作者：
B. senowbaRi
中科院分区：
文献类型：
--
作者：
P. Schäfer;B. senowbaRi
本文对奥地利萨尔斯堡地区北方石灰岩阿尔卑斯山上出露的四个上三叠统礁群进行了详细的研究，特别强调了礁群的相发育和古生态分带。Adnet礁结构直接生长在浅水碳酸盐岩背景的碳酸盐岩台地上，Rotelwand和Feichelwand礁群生长于科森盆地，分两个不同的阶段：丘状阶段和2浅水礁阶段，而同样发育在科森盆地内的格鲁伯礁只显示深水泥丘阶段，因为浅水阶段在该位置不发育。礁复合体的浅水礁阶段显示由五个不同的相单元组成的侧向相分带：I珊瑚海绵相的中心礁区，2核状体相的暴露上部礁最高水能量带内的斜坡3个暴露的较低礁坡的藻类有孔虫相和作为Adnet礁结构的基础4个礁坡的背风和最深部分的礁碎屑泥相，其中礁组分与科森盆地沉积物交指，以及5个盆地本身的陆源泥相。Rotelwand和Feichelwand礁复合体显示线性相分带，而Adnet礁本文详细研究了各种斑状礁的组成关系、总体形态、古生态环境和沉积环境。研究结果表明，钙质藻类、各种微生物和有孔虫具有很强的生物多样性，它们在生物群中的分布具有多样性。在生物礁复合体内具有明显的分布模式，可作为相指示，并可区分中心礁区内不同的生物生境
Four Upper Triassic patch reefs exposed in the Northern Limestone Alps of the Salzburg area of Austria were subjected to detailed study Especial emphasis was placed on facies development and paleoecologic zonation of the reef complexes The Adnet Reef structure grew directly on a carbonate platform in a shallow water carbonate setting the Rotelwand and Feichtenstein Reef complexes grew out of the Kossen Basin in two distinct stages I a deeper water mud mound stage and 2 a shallow water reef stage whereas theGruber Reef which also developed within the Kossen Basin only shows a deeper water mud mound stage since a shallow water phase did not develop at this location The shallow water reef stages of thereef complexes display a lateral facies zonation consisting of five different facies units I coral sponge facies of the central reef areas 2 oncolitic facies of the exposed upper reef slopes within zones of highest water energy 3 algal foraminiferal facies of the exposed lower reef slopes and as the foundation of theAdnet Reef structure 4 reefdetritus mud facies of the leeward and deepest portions of thereef slopes where reefal components interfinger with Kossen basinal sediments and 5 terrigenous mud facies of the basin proper The Rotelwand and Feichtenstein Reef complexes display a linear facies zonation while the Adnet Reef Structure displays a circular and somewhat patchy facies zonation Organism communities forming thereef biota are characterized by the association of various reef framebuilders and their epi and endobionts The compositional relationships of the various patch reefs their gross morphology paleoecologic setting and depositional environments have been studied in detailThis study has demonstrated that calcareous algae various microproblematica and foraminifers show very distinct distributional patterns within the reef complexes and can be used as facies indicators as well as differentiating different biotopes within thecentral reef areas