Multistratigraphic framework for continental Permian-Triassic boundary sections of northern Pangaea: key to a better understanding of the ecological consequences of the end-Permian crisis in the terrestrial realm

盘古大陆北部二叠纪-三叠纪边界部分的多地层框架：更好地了解二叠纪末危机对陆地领域生态后果的关键

基本信息

批准号：
239665278
负责人：
Professor Dr. Jörg W. Schneider
金额：
--
依托单位：
Paleontological Institute
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/239665278?language=en
关键词：
Multistratigraphic framework continental Permian Triassic

项目摘要

Global processes at the Permian-Triassic boundary (PTB) caused the most severe biodiversity crisis known. In order to understand the triggering mechanisms of this mass extinction, multidisciplinary research on marine and terrestrial ecosystems is required. Within the marine realm a continuous fossil record enables high-resolution biostratigraphy, whereas time resolution is usually limited in the terrestrial realm due to discontinuous sedimentation. Thus, marine-terrestrial teleconnections are difficult to detect and therefore a highly controversial topic. Additionally, the majority of terrestrial PT sections of northern Pangaea are characterized by a hiatus at the critical PTB interval. Consequently, the few complete terrestrial PTB sections of central Europe, the Russian syncline, Siberia and N China are pivotal for deciphering the triggering processes of the end-Permian crisis. Accordingly, project aims are:A) The project aims to detect the position of the PTB in continental series using a multistratigraphic approach, and to correlate continental boundary sections with marine reference sections. Biostratigraphic investigations will focus on conchostracans. The current correlation schemes based on conchostracans need to be refined and calibrated by radiometric dating of pyroclastics as well as by integrating magneto- and chemostratigraphic (d13C-, d18O-, d34S-isotope) data. B) Furthermore, the project aims to elaborate biotic and abiotic data which are suited to characterize environmental changes in mixed marine-continental as well as in exclusively continental PTB sections within different geotectonic and climatic settings. The focus is set on palynofacies, documentation of facies architectures and palaeosoils as well as on isotopic and sediment geochemistry. The selected boundary sections form a transect from the marine stratotype section in Meishan (S China) via mixed marine-continental sections in S China to pure continental sections in N China. These boundary sections can be precisely correlated by marine fossils (conodonts, fusulinids) and radiometric data from pyroclastics. The transect is continued by continental PTB sections of the Russian syncline with a precise tetrapod- and magneto-/isotope-stratigraphic framework, and via Hungary and Poland to the continuous PTB section of the Central European basin. All these sections yield conchostracans in the critical PT transition (own preliminary work) which will enable precise marine-terrestrial correlations. Furthermore, the transect crosses different geotectonic units and different biomes. Thus, it will be possible to distinguish regional tectonical and regional climatic processes (effects of palaeolatitude) from global processes across the PTB. The data obtained will enable a critical analysis of existing hypotheses on the PTB event and its triggering mechanisms and finally, will contribute to the understanding of global processes causing major perturbation of ecosystems.

二叠纪-三叠纪边界（PTB）的全球过程造成了已知的最严重的生物多样性危机。为了了解这次大规模灭绝的触发机制，需要对海洋和陆地生态系统进行多学科研究。在海洋领域，连续的化石记录可以实现高分辨率的生物地层学，而在陆地领域，由于不连续的沉积，时间分辨率通常受到限制。因此，海洋-陆地遥相关很难检测，因此是一个备受争议的话题。此外，盘古大陆北部的大多数陆地 PT 部分的特点是在关键的 PTB 间隔处存在间断。因此，中欧、俄罗斯向斜、西伯利亚和中国北部为数不多的完整陆地PTB剖面对于破译二叠纪末危机的触发过程至关重要。因此，项目目标是：A) 该项目旨在使用多地层方法探测大陆系中 PTB 的位置，并将大陆边界部分与海洋参考部分相关联。生物地层学研究将集中于壳甲虫。当前基于壳甲虫的关联方案需要通过火山碎屑的辐射测年以及整合磁地层和化学地层（d13C-、d18O-、d34S-同位素）数据来完善和校准。 B) 此外，该项目旨在详细阐述生物和非生物数据，这些数据适合描述不同大地构造和气候背景下海洋-大陆混合以及大陆 PTB 剖面的环境变化特征。重点是孢粉相、相结构和古土壤的记录以及同位素和沉积物地球化学。选定的边界剖面形成了从眉山海相层型剖面、华南海陆混合剖面到华北纯大陆剖面的横断面。这些边界部分可以通过海洋化石（牙形刺、fusulinids）和火山碎屑的辐射数据精确关联。该样线由俄罗斯向斜的大陆 PTB 部分延续，具有精确的四足和磁/同位素地层框架，并通过匈牙利和波兰到达中欧盆地的连续 PTB 部分。所有这些部分都在关键的 PT 转变（自己的初步工作）中产生了壳甲虫，这将实现精确的海洋-陆地相关性。此外，样线跨越不同的大地构造单元和不同的生物群落。因此，将有可能将区域构造和区域气候过程（古纬度的影响）与整个PTB的全球过程区分开来。获得的数据将有助于对 PTB 事件及其触发机制的现有假设进行批判性分析，最后将有助于理解造成生态系统重大扰动的全球过程。