Evaluating the impact of the Toarcian oceanic anoxic event on neritic platform systems in NW-Africa

评估托阿尔纪海洋缺氧事件对非洲西北部浅海平台系统的影响

• 批准号: 191703526
• 负责人: Professor Dr. Stephane Bodin
• 金额: --
• 依托单位: Institut for Geoscience
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/191703526?language=en
• 关键词: Evaluating; impact; Toarcian; oceanic; anoxic

The Early Toarcian is characterized by the occurrence of the first Mesozoic Oceanic Anoxic Event (OAE). This event (T-OAE) is associated with a very significant and complex perturbation of the Early Jurassic ocean-atmosphere system. In TOAE research, much attention has previously been paid to open oceanic settings as exposed in European outcrop belts. In contrast, field and geochemical evidence from non-European areas is surprisingly scarce. This forms a strong motivation for the project proposed here, aiming to assess the impact of Late Pliensbachian – Middle Toarcian palaeoenvironmental perturbations in the High Atlas Basin of Morocco. The High Atlas of Morocco offers an exceptional natural laboratory for this purpose. This as not only T-OAE-related basinal sediments but also their coeval platform equivalents are well exposed. In this region, the carbonate platform ecosystem is marked by repeated disruption and re-installation episodes, probably linked to environmental changes associated with the T-OAE. Rapid generation of accommodation space has lead to stratigraphically expanded basinal sections allowing for sampling in an extremely high temporal resolution across the Toarcian interval. Consequently, a high-resolution, multi-proxy approach (C, O and Sr isotopes, phosphorus, clay mineralogy) is proposed. Geochemical analyses are to be coupled with a detailed sedimentological and paleo-ecological assessment of carbonate platform successions. These tools will be applied both to platform and coeval basinal successions in order to characterize the differential response mechanisms of neritic versus basinal responses to Early Jurassic carbon cycle perturbations along the southwestern Tethyan margin.

早托阿世以第一次中生代海洋缺氧事件（OAE）的发生为特征。这一事件（T-OAE）是与一个非常重要的和复杂的扰动的早侏罗世海洋-大气系统。在TOAE研究中，以前曾对欧洲露头带暴露的开阔大洋环境给予了很大关注。相比之下，来自非欧洲地区的实地和地球化学证据令人惊讶地稀少。这形成了这里提出的项目的强烈动机，旨在评估摩洛哥的高阿特拉斯盆地的晚Pliensbachian -中Toarcian古环境扰动的影响。摩洛哥的高阿特拉斯为这一目的提供了一个特殊的自然实验室。这不仅是因为与T-OAE相关的盆地沉积物，而且其同时代的台地相当物也暴露良好。在这一地区，碳酸盐台地生态系统的特点是反复中断和重新安装的插曲，可能与环境变化与T-OAE。快速生成的容纳空间导致地层扩大盆地部分允许采样在一个非常高的时间分辨率在整个Toarcian间隔。因此，提出了一种高分辨率，多代理方法（C，O和Sr同位素，磷，粘土矿物学）。地球化学分析将与对碳酸盐台地演替的详细沉积学和古生态评估相结合。这些工具将被应用到平台和同时代盆地的继承，以表征浅海与盆地的响应，早侏罗世碳循环扰动沿着西南特提斯边缘的差异响应机制。

项目成果

The middle Toarcian cold snap: Trigger of mass extinction and carbonate factory demise

• DOI: 10.1016/j.gloplacha.2014.03.008
• 发表时间: 2014-06
• 期刊: Global and Planetary Change
• 影响因子: 3.9
• 作者: François-Nicolas Krencker;S. Bodin;R. Hoffmann;G. Suan;E. Mattioli;L. Kabiri;K. Föllmi;A. Immenhauser-A.

Toarcian extreme warmth led to tropical cyclone intensification

托阿尔奇极端高温导致热带气旋增强

• DOI: 10.1016/j.epsl.2015.06.003
• 发表时间: 2015
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Krencker;Heimhofer;Kabiri;Immenhauser
• 通讯作者: Immenhauser

Perturbation of the carbon cycle during the late Pliensbachian – early Toarcian: New insight from high-resolution carbon isotope records in Morocco

• DOI: 10.1016/j.jafrearsci.2015.12.018
• 发表时间: 2016-04
• 期刊: Journal of African Earth Sciences
• 影响因子: 2.3
• 作者: S. Bodin;François-Nicolas Krencker;T. Kothe;R. Hoffmann;E. Mattioli;U. Heimhofer;L. Kabiri