INTOMESS: Quantification of salinity and temperature changes accompanying the way INTO the Mediterranean MESSinian Salinity Crisis

INTOMESS：量化盐度和温度变化，伴随进入地中海麦西尼亚盐度危机

• 批准号: 449448496
• 负责人: Dr. Iuliana Vasiliev-Popa, Ph.D.
• 金额: --
• 依托单位: Senckenberg Biodiversität und Klima Forschungszentrum (BiK-F)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/449448496?language=en
• 关键词: INTOMESS; Quantification; salinity; temperature; changes

Since its discovery, the Messinian Salinity Crisis (MSC; 5.97 – 5.33 Ma) became the archetype of dramatic hydrologic change on an intracontinental scale providing the most recent and least disturbed long-term record of abrupt and severe water budget change in Earth’s history. The MSC was the result of altering the connections between the Atlantic Ocean and the Mediterranean basin resulting in dramatic sea level fluctuations, total turnover of bio-ecosystems governed by the development of hypersaline water bodies and deposition of >1000 m evaporite units on the basin floor. Despite many years of research, we still face important knowledge gaps, in particular concerning the hydrological dynamics en route to the MSC climax. A key to the solution can be found in the salinity history of the mediterranean bansin: Biomarker analytics allow us today to obtain sea surface temperature estimates by using the UK’37 and TEX86 proxies. Combining these sea surface temperature estimates with δ18Oforam data from the same stratigraphic levels then permits to quantify sea surface salinity changes that in turn inform about basin water evolution leading into the MSC crisis. Detailed salinity reconstructions, ultimately, will help deciphering if Messinian salinity change occured suddenly or in a gradual fashion and if precessional cyclicity was important in modulating the salinity variations during the Messinian until the onset of the MSC. Guiding key questions of this proposal will be: Was Mediterranean sea surface salinity already very high at the onset of the MSC, leading to the deposition of salts starting at 5.97 Ma? Are the salinity changes quasi-concomitant in the entire Mediterranean during the Messinian? Are the lithological differences expressed in the outcrops determined by salinity changes or result from diffrent oxygenation of the Mediterranean Sea water column? Collectively, these questions will allow us to identify if the salinity changes in the Messinian Mediterranean occurred in reversible steps modulated by precession or if these changes were controlled by the proximity to and restrictedness of the Atlantic gateway hence separating climatic from tectonic effects.

自其发现以来，墨西拿盐度危机（MSC; 5.97 - 5.33马）成为原型的戏剧性水文变化的陆内尺度上提供了最近的和最少的干扰长期记录的突然和严重的水收支变化在地球的历史。海安会是改变大西洋和地中海盆地之间的联系的结果，导致海平面剧烈波动，生物生态系统的总周转受到高盐度水体的发展和盆地底部>1000米蒸发岩单位的沉积的影响。尽管多年的研究，我们仍然面临着重要的知识差距，特别是关于水文动力学的路线上的MSC高潮。解决方案的关键可以在地中海班辛的盐度历史中找到：生物标志物分析使我们今天能够通过使用英国'37和TEX 86代理来获得海面温度估计。将这些海表温度估计值与来自相同地层水平的δ 18 Oforam数据相结合，然后允许量化海表盐度变化，进而告知导致MSC危机的盆地水演变。详细的盐度重建，最终，将有助于破译，如果墨西拿盐度变化突然发生或以渐进的方式，如果岁差周期是重要的，在调制的盐度变化在墨西拿，直到开始的MSC。本提案的指导性关键问题将是：地中海海洋表面盐度在MSC开始时已经非常高，导致盐沉积开始于5.97 Ma吗？在墨西拿期间，整个地中海的盐度变化是准伴随的吗？露头中的岩性差异是由盐度变化决定的，还是由地中海水柱的不同氧化作用造成的？总的来说，这些问题将使我们能够确定，如果在地中海的盐度变化发生在由岁差调制的可逆步骤，或者如果这些变化是由大西洋门户的接近和限制，从而分离气候构造效应。