The impact of the Miocene Carbonate Crash in the Atlantic and Pacific: Evidence from carbonate budgets and silt grain size studies

大西洋和太平洋中新世碳酸盐崩塌的影响：来自碳酸盐预算和淤泥粒度研究的证据

• 批准号: 13122863
• 负责人: Professor Dr. Rüdiger Henrich
• 金额: --
• 依托单位: Fachbereich 05: Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/13122863?language=en
• 关键词: impact; Miocene; Carbonate; Crash; Atlantic

In the current project causes, development, evolution and termination of the Middle to Late Miocene carbonate crash events in the Atlantic and Pacific will be studied comparatively. Different hypothesis to explain these events were postulated, e.g. (1) changes in deep water circulation connected with the Initiation and/or strengthening of NADW formation and subsequent shifts in its production modes, (2) changes in overall terrigenous sediment supply to the ocean caused by the uplift of high mountain ranges and the development of huge river drainage Systems, (3) perturbations of the oceanic carbonate System induced by the Initiation of the continental margin upwelling Systems and the resultant expansion of deserts on the African continent, and (4) changes in the ecologic conditions and/or the evolution of the phytoand Zooplankton during the Middle Miocene to Pliocene that were responsible for shifts in the carbonate concentrations and for variable contributions of coccoliths and planktic foraminifers. To test these different hypothesis of potential causes we study carbonate and terrigenous flux rates and determine carbonate preservation and paleo-bottom current intensities along depth traverses at Cearä Rise and compare the results with records from other key locations in the Atlantic and Pacific.

在当前的项目原因中，将比较研究大西洋和太平洋中期碳酸盐崩溃事件的发展，进化和终止。解释这些事件的不同假设已发布，例如（1）与NADW形成的起始和/或加强有关的深水循环变化以及其生产模式的随后变化，（2）（2）由于高山范围的隆起而导致的海洋总体沉积物供应的变化以及巨大的河流排水系统的发展，（3）由海洋系统的发展及其范围的范围，并构成了海洋范围的范围，而越来越多的海洋系统启动了启动的启动。在非洲继续进行，（4）中新世中期对上新世期间植物和浮游生物的演变的变化，这些变化是导致碳酸盐浓度的转移以及可去碳酸盐浓度的转移以及可变的可变性和planktic孔的可变贡献。为了检验潜在原因的这些不同的假设，我们研究了碳酸盐和陆源通量速率，并确定沿Cearä上升深度遍历的碳酸盐保存和古底电流强度，并将结果与​​大西洋和太平洋其他关键位置的结果进行比较。