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The Campanian - Maastrichtian (Late Cretaceous) climate transition: the history of palaeoceanographic changes

坎帕尼亚-马斯特里赫特阶（晚白垩世）气候转变：古海洋变化的历史

基本信息

批准号：
143279531
负责人：
Professor Dr. Martin Frank
金额：
--
依托单位：
Institut für Geowissenschaften (IfG)
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/143279531?language=en
关键词：
Campanian Maastrichtian Late Cretaceous climate

项目摘要

The latest Cretaceous was characterised by the transition of the Earth´s system from the Cretaceous greenhouse to the cooler Cenozoic climate that includes several perturbations in the global carbon cycle. The aim of this project is to investigate the history of changes in ocean circulation and deepwater formation in the tropical Pacific (Site 1210B, Shatsky Rise) relative to the latest Campanian to early Maastrichtian carbon isotope events (CMBE and MME). The history of changes in surface- and deep-water temperature will be reconstructed in the course of the carbon isotope events using highresolution benthic and planktic foraminiferal stable isotope analyses. Changes in ocean circulation and the source regions of different deep and intermediate water masses will be deciphered by using radiogenic isotopes (Nd). Nd isotope analyses of ferromanganese oxide coatings of bulk sediments from the tropical Pacific, the South Atlantic and the Southern Ocean will allow the reconstruction of deep-water isotope signatures. By comparison of different locations past water mass flow in the tropical Pacific and its relationship to carbon cycle perturbations will be reconstructed. Thereby, the developed age-model comparison between various ocean and shelf-sea sections provides the unique opportunity to recognize leads and lags between the carbon cycle and ocean circulation.

最新的白垩纪的特征是地球系统从白垩纪温室过渡到较冷的新生代气候，包括全球碳循环的几次扰动。该项目的目的是调查热带太平洋（1210 B站点，沙茨基海隆）海洋环流和深水形成相对于最新坎帕尼亚至早期马斯特里赫特碳同位素事件（CMBE和MME）的变化历史。在碳同位素事件发生过程中，将利用高分辨率底栖和浮游有孔虫稳定同位素分析，重建表层水和深水温度变化的历史。海洋环流的变化和不同的深，中层水团的源区将被破译使用放射性同位素（Nd）。对来自热带太平洋、南大西洋和南大洋的大块沉积物的铁锰氧化物涂层进行钕同位素分析，将能够重建深水同位素特征。通过对不同地点过去热带太平洋水团流的比较，重建其与碳循环扰动的关系。因此，发达国家的年龄模型之间的比较，各种海洋和陆架海部分提供了独特的机会，以认识到铅和碳循环和海洋环流之间的滞后。