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系列 2 和 3 期间各个寒武纪大陆的生物群和沉积环境的变化。这些变化被认为描绘了（i）生物多样性的变化和多样化，表明了主要动物群体系统发育的特征，以及（ii）区域乃至全球环境的转变或转变。对这些变化更好的限制不仅可以实现地层相关性的显着改进，而且还可以为迄今为止研究很少的从寒武纪早期（寒武纪系列 2）具有高度特有性的骨骼动物群到明显的特有动物群的转变提供线索。中寒武纪早期（寒武纪系列 3）中更均匀的动物群，其特征是所谓的寒武纪辐射事件的末期，这是有机物进化中最戏剧性的时期整个地球历史中的世界。它还将有助于更好地理解从传统含化石早寒武纪地层的普遍含氧良好和相对高能量的环境到缺氧、经常停滞的条件，到在大多数大陆上观察到的中寒武世令人惊讶的均匀环境的变化。计划的研究活动将侧重于对研究不完善的骨骼化石进行分类学研究，以及寒武纪大陆各地区动物群组成以及生物变化与海平面波动及其特征的相关性研究。来自不同地区的先前未描述的后生动物骨骼化石（主要是三叶虫）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对热带和温带古大陆（即西冈瓦纳、阿瓦隆尼亚、波罗的海、劳伦大陆和扬子地台）的动物和海平面变化进行全球综合，这是全球最引人注目的时期之一。地球历史。该综合将解决对该区间的洲际相关性的高度分歧的观点以及对变化原因的调查不充分，并且是对 ISCS 全球细分项目的重大贡献。