Early and middle Cambrian metazoan biodiversity and fine-scale stratigraphy: aspects of the Cambrian Radiation Event and environmental controls on Cambrian continents

早、中寒武世后生动物生物多样性和细尺度地层学：寒武纪辐射事件的各个方面和寒武纪​​大陆的环境控制

• 批准号: 322587359
• 负责人: Professor Dr. Gerd Geyer
• 金额: --
• 依托单位: Lehrstuhl für Geodynamik und Geomaterialforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/322587359?language=en
• 关键词: Early; middle; Cambrian; metazoan; biodiversity

The project aims at a precise documentation of changes in the biota and depositional environments during the Cambrian Series 2 and 3 on various Cambrian continents. Such changes are believed to portray (i) changes and diversification in the biodiversity that indicates the character of phylogeny of major animal groups, and (ii) shifts or conversions in regional, and eventually global environments. Better constraints on these changes will not only permit significant refinements in stratigraphic correlation to be achieved but they will also provide clues for the so far poorly studied conversions from skeletal faunas with a high degree of endemism in the early Cambrian (Cambrian Series 2) to distinctly more uniform faunas in the early middle Cambrian (Cambrian Series 3) that features the terminal phase of the so-called Cambrian Radiation Event, the most dramatic period of evolution in the organic world during the entire earth history. It will also contribute to a better understanding of changes from generally well oxygenated and relatively high energy environments of the traditional fossil-bearing early Cambrian strata via dysoxic, often stagnant condition to the surprisingly uniform environments of the middle Cambrian observed on most continents. The planned research activities will focus on taxonomic investigations of imperfectly studied skeletal fossils together with studies on faunal composition and the correlation of the biotic changes with sea-level fluctuations and its characters in various regions of the Cambrian continents. Previously undescribed skeletal metazoan fossils (primarily trilobites) from various regions will be systematically studied and described. The ultimate objective of the three-year project is a global synthesis of faunal and sea-level changes on tropical and temperate palaeocontinents (i.e., West Gondwana, Avalonia, Baltica, Laurentia, and the Yangtze Platform) for one of the most dramatic intervals in earth history. The synthesis will allow a resolution of highly divergent views for intercontinental correlation of this interval and the poorly investigated reasons for the changes and is a major contribution to the global subdivision project of the ISCS.

该项目旨在精确记录寒武纪第二和第三系在各寒武纪大陆上的生物群和沉积环境的变化。这些变化被认为描绘了(i)表明主要动物类群系统发育特征的生物多样性的变化和多样化，以及（ii）区域乃至全球环境的变化或转换。对这些变化进行更好的约束，不仅可以实现地层对比的重大改进，而且还将为迄今为止研究不足的从早寒武纪（寒武纪系列2）高度特有的骨骼动物群到早寒武纪（寒武纪系列3）明显更统一的动物群的转变提供线索，这种转变以所谓的寒武纪辐射事件的结束阶段为特征。这是整个地球历史上生物世界最戏剧性的进化时期。它还将有助于更好地理解从传统的含化石早寒武纪地层的一般良好氧合和相对高能量环境到缺氧，通常停滞状态到在大多数大陆上观察到的中寒武纪令人惊讶的均匀环境的变化。计划的研究活动将集中在寒武纪大陆不同地区尚未完全研究的骨骼化石的分类学调查，以及动物组成和生物变化与海平面波动的相关性及其特征的研究。以前未被描述的骨骼后生动物化石（主要是三叶虫）从不同的地区将被系统地研究和描述。这个为期三年的项目的最终目标是全球综合热带和温带古大陆（即西冈瓦纳、阿瓦洛尼亚、波罗的海、劳伦西亚和扬子地台）在地球历史上最戏剧性的时期之一的动物和海平面变化。这一综合将有助于解决对这一区间的洲际相关性和对变化原因调查不足的高度分歧的看法，并且是对国际空间观测系统全球细分项目的重大贡献。