Ichnology of the Ordovician Cruziana rugosa group in Western Europe and in the Near East and its palaeoecological potential for Mediterranean Gondwana

西欧和近东奥陶纪 Cruziana rugosa 群的地质学及其对地中海冈瓦纳古生态的潜力

• 批准号: 539276353
• 负责人: Professor Dr. Olaf Elicki
• 金额: --
• 依托单位: Lehrstuhl für Paläontologie / Stratigraphie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/539276353?language=en
• 关键词: Ichnology; Ordovician; Cruziana; rugosa; group

The Ordovician represents a period of dramatic changes in the biosphere. Initiated by fundamental climatic, oceanographic and transitions of exogenic material cycles, an unprecedented diversification of marine life led to palaeoecological differentiation and to changes in the organism-substrate interactions, which are important tools for numerous geological applications, such as biostratigraphy, palaeogeography, modelling of living and depositional environments and their regional and transregional correlation. Such transformations are documented from this period – when marine shelfs reached their widest extension in the entire Phanerozoic (Ordovician) – especially from the shallow marine realm. While different groups of marine invertebrates from the Ordovician period have been well studied with regard to their importance as biostratigraphic and palaeoecological tools, the usefulness of Ordovician ichnocoenoses, however, has so far only rarely been subject of in-depth studies. There is a distinct knowledge gap particularly for the widespread peri-Gondwanan deposits without any body fossil content – the closing of this gap must be classified as a major task of the international Ordovician research. The proposed project aims to investigate the „Mediterranean Province“ of the northern peri-Gondwanan shelf area in present-day NW France (Armorican Massif, Brittany) and in the Near/Middle East (SE Turkey and S Jordan, Arabian Plate) with respect to its Lower Ordovician ichnofauna, in particular to the characteristic Cruziana rugosa group. In preparation to the project, in the above-mentioned areas the project working group succeeded in the discovery of hitherto unknown spectacular trace fossil sites of Cruziana rugosa group assemblages. By an interdisciplinary approach, which combines palaeontological-palaeobiological and sedimentological-facies methods, it will be possible to capture spatiotemporal characteristics of the Cruziana rugosa group and to define their potential as a facies, a palaeoecological, a paleogeographic and a transregional correlation tool in geosciences. Modifying local factors will be identified along a palaeogeographic gradient, and will be result in the reconstruction of palaeo-latitudinal diversity shifts. Largely based on the high quality and the palaeogeographical position of the newly discovered fossil sites in Western Europe and the Near/Middle East a reliable tool for transregional correlation at the northern peri-Gondwanan rim will be developed by palaeontological and sedimentological studies as well as by palaeoecological, facies and palaeogeographical conclusions. The proposed project fills a critical gap in the current international efforts of investigation of the Lower/Middle Ordovician Biosphere and of the fundamental qualitative changes in the biosphere-geosphere interactions in the early Palaeozoic.

奥陶纪代表了生物圈发生巨大变化的时期。由基本的气候、海洋学和外源物质循环的转变引发的海洋生物前所未有的多样化导致了古生态分化和生物-基质相互作用的变化，这是许多地质应用的重要工具，如生物地层学、古地理学、生活和沉积环境建模及其区域和跨区域的相互关系。这种转变是从这一时期开始记录的--当时海洋陆架在整个古生代（奥陶纪）达到了最广泛的延伸--特别是从浅海区开始。虽然奥陶纪时期的不同海洋无脊椎动物群体作为生物地层学和古生态学工具的重要性已经得到了很好的研究，但奥陶纪遗迹群落的有用性迄今为止很少得到深入研究。有一个明显的知识差距，特别是广泛的冈瓦纳周围沉积物没有任何身体化石内容-这个差距的关闭必须列为国际奥陶纪研究的主要任务。拟议的项目旨在调查现今法国西北部（Armorican Massif，布列塔尼）和近东/中东（土耳其东南部和约旦南部，阿拉伯板块）冈瓦纳大陆架周围北方地区的“地中海省”的下奥陶世遗迹动物群，特别是特征性的Cruziana rugosa群。在项目筹备过程中，项目工作组在上述地区成功发现了迄今为止未知的壮观的Cruziana rugosa组组合遗迹化石遗址。通过一个跨学科的方法，结合古生物学-古生物学和沉积学-相的方法，它将有可能捕捉Cruziana rugosa组的时空特征，并确定其潜力作为一个相，古生态，古地理和跨区域的相关工具，在地球科学。改变局部的因素将沿古地理梯度沿着被识别，并将导致古纬度多样性变化的重建。在西欧和近东/中东新发现的化石地点的高质量和古地理位置的基础上，将通过古生物学和沉积学研究以及古生态、岩相和古地理结论，开发一种可靠的工具，用于冈瓦纳边缘北方的跨区域对比。拟议的项目填补了目前国际上对下/中奥陶世生物圈和早古生代生物圈-地圈相互作用的根本质变进行调查的努力中的一个关键空白。