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首页> 外文期刊>Facies >Late Visean (MFZ14) foraminifers and algae from the Kirchbach Limestone (Carnic Alps, Austria) and geological implications
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Late Visean (MFZ14) foraminifers and algae from the Kirchbach Limestone (Carnic Alps, Austria) and geological implications

机译：Kirchbach石灰石（奥地利卡恩阿尔卑斯山）的晚期Visean（MFZ14）有孔虫和藻类及其地质意义

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摘要

The Kirchbach Limestone occurs in the middle part of the early Visean to Bashkirian Hochwipfel Formation, which was deposited in a flysch basin that formed during an extensional rifting phase in the foreland of the Noric Terrane, was filled with deep-marine synorogenic sediments and closed during the Bashkirian. The Noric Terrane split off from Gondwana and drifted towards the north, closing the flysch basin, which was part of the PaleoTethys. The Kirchbach Limestone is composed of bioclastic mudstone and carbonate conglomerate. Microfacies of the limestone clasts include wackestone, packstone, grainstone, and rudstone with diverse fossil assemblages. Bindstone clasts are derived from very shallow, restricted environments. Other clasts are bioclastic mudstone derived from deeper settings. All the foraminifers and algae identified correspond to the upper MFZ14 biozone, after the appearance of Bradyina; in contrast, the markers of the uppermost MFZ14 (Asteroarchaediscus, Loeblichia para-ammonoides, and Warnantella) and those of MFZ15 (Janischewskina, Climacammina, and Biseriella) are totally absent. The Kirchbach markers are Cribrospira mikhailovi, Bradyina cf. flosculus, Howchinia bradyana, and Eostaffella parastruvei. Revised local taxa are Mstinia, M. minima n. comb., Consobrinellopsis n. gen., and C. ex gr. consobrina n. comb. The Kirchbach Limestone is derived from a shelf area displaying various shallow-water environments from which the clasts were transported into deeper-marine environments as sediment gravity flows. Limestone clasts of the Kirchbach Limestone indicate the presence of a shallow carbonate shelf along the northern margin of the Hochwipfel flysch basin. The late Asbian (MFZ14) limestone clasts derived from this carbonate shelf were probably subaerially exposed prior to their reworking and redeposition within the flysch sediments, which are late Brigantian (MFZ15) in age. Fossiliferous carbonate shelf sediments of Visean-Serpukhovian (Namurian) age in the Veitsch Nappe of the eastern Graywacke Zone may be remnants of this shelf. Similar trilobite faunas of No " tsch and Veitsch indicate that they were originally adjacent and probably connected to this shelf north of the flysch basin. These data confirm that the Carnic Alps were located in the Visean Mediterranean subprovince.
机译：Kirchbach石灰岩发生在Visean早期至Bashkirian Hochwipfel组的中部，该组沉积于在Noric Terrane前陆的伸展裂谷阶段形成的复理盆地中，充满了深海协同成因沉积物，并在此期间关闭。巴什基里亚人。诺里克人地带从冈瓦纳（Gonwana）分离并向北漂移，关闭了古特提斯山脉（FreeoTethys）的复理盆地。 Kirchbach石灰岩由生物碎屑泥岩和碳酸盐砾岩组成。石灰岩碎屑的微相包括瓦克石，pack石，花岗石和鲁德石，并具有多种化石组合。宾德斯碎片来自非常浅的，受限制的环境。其他碎屑是来自深部环境的生物碎屑泥岩。布雷迪亚娜出现后，所有鉴定到的有孔虫和藻类均对应于上部MFZ14生物区。相反，完全没有最上层的MFZ14（星状古菌，对虾双歧Loeblichia，和Warnantella）和MFZ15（Janischewskina，Climacammina和Biseriella）的标记物。 Kirchbach标记是Cribrospira mikhailovi，Bradinacf。小花，虎尾草（Howchinia bradyana）和花粉小球藻（Eostaffella parastruvei）。修订后的当地分类群是Mstinia，M. minima n。梳子。 gen。，and C. ex gr。孔波斯纳梳。基尔希巴赫石灰岩是从一个架子区域衍生出来的，该架子区域显示了各种浅水环境，随着沉积物的重力流动，这些碎屑被从这些浅海环境运输到深海环境。 Kirchbach石灰岩的石灰岩碎屑表明，Hochwipfel flysch盆地北缘存在浅碳酸盐岩架。从该碳酸盐岩架中衍生出的晚期阿斯比亚（MFZ14）石灰岩碎屑可能在对其进行修造和再沉积之前，在年龄较不列颠时期（MFZ15）的复石沉积物中进行了海底暴露。格雷沃克地区东部维特施纳普火山的Visean-Serpukhovian（Namurian）时代的化石碳酸盐陆架沉积物可能是该陆架的残余物。 No tsch和Veitsch的类似三叶虫动物区系表明它们最初是相邻的，并且可能与flysch盆地以北的这个陆架相连。这些数据证实了卡恩阿尔卑斯山位于Visean地中海次区域。

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