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

该项目的目的是调查热带和亚热带北大西洋在全球碳循环扰动期间的循环沉积的轨道强迫，该扰动被称为塞诺马尼亚/图罗尼亚海洋缺氧事件(OAE 2)。我们的目标是使用高分辨率XRF岩心扫描，在热带西大西洋的德梅拉拉隆起(ODP站1258、1260和1261)、北美近海(DSDP站603b)和意大利翁布里亚古比奥(S4核)生成时间序列。X射线荧光元素浓度的相对变化将通过光谱分析进行分析，并与已公布的OAE 2δ13C异常记录进行校准，从而形成区域旋回地层学。站点间优势轨道周期的比较将显著改善OAE 2的轨道时间尺度。这种新的时间尺度为建立大西洋和西特提斯以及邻近陆架海(如德国北部旺斯托夫)之间的高分辨率对比提供了独特的机会，并认识到不同大洋背景下缺氧形成、海洋环流和温度的区域变化之间的领先和滞后。

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.