Orbital chronology for the Cenomanian-Turonian Oceanic Anoxic Event 2 and its environmental implications

该项目的目的是调查在全球碳循环扰动期间，即被称为Cenomanian/Turonian海洋缺氧事件（OAE 2）的热带和亚热带北大西洋循环沉积物的轨道强迫。我们的目标是使用高分辨率XRF岩心扫描在热带西大西洋的Demerara Rise（ODP站点1258、1260和1261）、北美海岸（DSDP站点603 B）和意大利翁布里亚的Gubbio（S4岩心）生成时间序列。将通过光谱分析来分析XRF元素浓度的相对变化，并根据OAE 2 δ 13 C异常的已公布记录进行校准，从而制定区域旋回地层学。主要轨道周期的站点间比较将显著改进OAE 2的轨道时间尺度。这样一个新的时间尺度提供了一个独特的机会，建立大西洋和西特提斯以及相邻的陆架海之间的高分辨率的相关性。G. Wunstorf，德国北部），并认识到在不同的海洋环境中缺氧形成、海洋环流和温度的区域变化之间的超前和滞后。

The aim of this project is to investigate the orbital forcing of cyclic deposits in the tropical and subtropical North Atlantic during the global carbon cycle perturbation known as the Cenomanian/Turonian Oceanic Anoxic Event (OAE 2). We aim to generate time series at Demerara Rise, tropical Western Atlantic (ODP Sites 1258, 1260 and 1261), off the coast of North America (DSDP Site 603B) and at Gubbio, Umbria, Italy (S4 core) using high-resolution XRF core scanning. The relative changes in XRF element concentrations will be analysed by spectral analysis and calibrated against published records of the OAE 2 δ13C anomaly resulting in the development of regional cyclostratigraphies. The inter-site comparison of dominant orbital periodicities will significantly improve the orbital time scale for OAE 2. Such a new time scale provides the unique opportunity to establish high-resolution correlations between the Atlantic and Western Tethys as well as adjacent shelf seas (e. g. Wunstorf, N-Germany) and to recognize leads and lags between the regional changes in the formation of oxygen deficiency, ocean circulation and temperature in different oceanic settings.