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FP 08: Evaluation of the Ca Isotope System in Carbonate Polymorphs as a new Proxy for Seawater Temperature and Secular Variations of Ca Conventration and Fractionation throughout Earth History

FP 08：评估碳酸盐多晶型物中的 Ca 同位素系统作为海水温度的新代理以及整个地球历史中 Ca 浓度和分馏的长期变化

基本信息

批准号：
5446384
负责人：
Professor Dr. Anton Eisenhauer
金额：
--
依托单位：
GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
依托单位国家：
德国
项目类别：
Research Grants
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/5446384?language=en
关键词：
FP 08 Evaluation Ca Isotope

项目摘要

We propose the investigation of the thermodynamic and paleooceanographic principles of calcium (Ca) isotope fractionation (¿ 44Ca) during biomineralization and inorganic preciptation of calcium carbonate... This is important because recent findings indicate that the Ca isotope system represents a new proxy for the reconstruction of past seawater temperatures and for variations of the Ca seawater concentrations throughout Earth¿s history. Both aspects are crucial for paleooceanography and -climatology because they interfere with the global carbon cycle influencing the concentration of important greenhouse gases likes C02 throughout time. The concept to validate the Ca isotopes as a paleo-proxy is to test its sensitivity of temperature calibration, the preservation of primary isotope signals, the knowledge of inter-specific differences and of past initial isotope ratios. These requirements will be investigated in laboratory and culturing experiments on inorganically precipitaled CaC03 and on major groups of marine calcifying organisms previously used as proxy archives... The proposed experimental cross-calibration of the Ca isotope system to temperature sensitive metal to calcium ratios... and other isotope systems... will be completed by field and down-core experiments offering the unique opportunity to refine their application as paleo-proxies in a multi-proxy approach.

我们建议对碳酸钙生物矿化和无机沉淀过程中钙（Ca）同位素分馏（¿44Ca）的热力学和古海洋学原理进行研究。这一点很重要，因为最近的研究结果表明，Ca同位素系统代表了重建过去海水温度和整个地球历史中Ca海水浓度变化的新代理。这两个方面对古海洋学和气候都至关重要，因为它们会干扰全球碳循环，影响二氧化碳等重要温室气体的浓度。验证Ca同位素作为古代用物的概念是测试其对温度校准、原始同位素信号保存、种间差异知识和过去初始同位素比值的敏感性。这些要求将在实验室和培养实验中对无机沉淀的CaC03和以前用作代理档案的主要海洋钙化生物群体进行研究。提出了钙同位素系统与温度敏感金属钙比的实验交叉校准。还有其他同位素系统……将通过现场和下核实验完成，提供独特的机会来完善它们作为多代理方法中的古代理的应用。