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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Geological history of the southern franconian Alb - The area of the Solnhofen lithographic limestone
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Geological history of the southern franconian Alb - The area of the Solnhofen lithographic limestone

机译：南部法兰克白垩纪的地质历史-Solnhofen光刻石灰岩地区

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摘要

An overview on the geological development of the Upper Jurassic in Southern Germany is presented. The geological and tectonic framework for the formation of bedded limestones and massive limestones as well as of so-called sponge-reefs is discussed. Historical interpretations (e.g. sponge-reefs, sponge-biostroms) and new interpretations (carbonate sand facies) are documented without final conclusions about their validity. Many observations allow the interpretation of varying models of the depositional environment of the Solnhofen Plattenkalks and especially of the Solnhofen Lithographic Limestone. Examples of characteristic embeddings of fossils in micrite can help to understand the deposition in extremely calm probably anoxic environments in different Plattenkalk basins sometimes altered by local events (e.g. turbidites). Furthermore, weak bottom currents and varying input of fine detrital sediment must to be taken into account. The Plattenkalk may have developed under conditions with salinity stratification. The carbonate mud of the lithographic limestones was probably washed into the stagnant water of the bottom zone from suspension load brought into the environment by storm events. The organisms embedded in this micrite originate from various environments in the surroundings of the basins. They stem from uppermost surface waters, extensive soft sediment areas on top of the surrounding sponge microbial mounds, from carbonate sand areas, from hardgrounds and reefal habitats, and from surrounding emerged island areas. The parameters discussed herein represent a basis for further discussions to understand the unique sedimentary conditions, the taphonomy of fossils, and finally the local varying preservation conditions.
机译：介绍了德国南部上侏罗统的地质发展概况。讨论了层状石灰岩和块状石灰岩以及所谓的海绵礁形成的地质和构造框架。记录了历史解释（例如，海绵礁，海绵生物圈）和新的解释（碳酸盐砂岩相），但没有关于其有效性的最终结论。许多观察结果可以解释Solnhofen Plattenkalks，尤其是Solnhofen平版印刷石灰石沉积环境的各种模型。在微晶石中的化石特征性嵌入实例可以帮助理解有时在当地事件（例如浊石）改变的不同Plattenkalk盆地中极为平静的缺氧环境中的沉积。此外，必须考虑弱水流和细碎屑沉积物的变化输入。 Plattenkalk可能在盐度分层的条件下形成。光刻石灰石的碳酸盐泥可能被暴风雨带入环境的悬浮负荷冲入了底部区域的停滞水中。嵌入在此微囊中的生物起源于盆地周围的各种环境。它们来自最上层的地表水，周围海绵微生物丘顶部的广泛的软质沉积物区域，碳酸盐砂土区域，硬地和珊瑚礁栖息地以及周围的新出现的岛屿区域。本文讨论的参数代表了进一步讨论的基础，以了解独特的沉积条件，化石的形态学以及最终局部变化的保存条件。

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