Fluid inclusion water isotopes in speleothems using CRDS - understanding carbonate d18O responses to climate variability

使用 CRDS 测量洞穴中的流体包裹体水同位素 - 了解碳酸盐 d18O 对气候变化的响应

• 批准号: 284356006
• 负责人: Dr. Tobias Kluge
• 金额: --
• 依托单位: Institut für Umweltphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/284356006?language=en
• 关键词: Fluid; inclusion; water; isotopes; speleothems

Fluid inclusions refer to small aliquots of water and/or gases contained inside minerals. They are relicts of the original fluid environment and in suitable archives can provide insights into the solution d18O and dD values and their evolution through time. Especially promising is an application to fluid inclusions in speleothems as this archive provides a good age control and is ubiquitous in most continental regions. Speleothems from Sauerland (Germany) grew during the Holocene and with their carbonate d18O values largely follow the global climatic patterns during this time period. d18O values, however, show discrepant responses to climatic events, in particular, during the 8.2 ka event and the Little Ice Age (LIA). Fluid inclusions can constrain the water d18O values and therefore help to disentangle the causes for the discrepant carbonate d18O values during 8.2 ka event and LIA. Furthermore, fluid inclusions in the Sauerland speleothems can be used to reconstruct the isotopic evolution of the precipitation in Germany during the Holocene and give clues for natural variability and its influence on the Central European climate. We intend to combine an apparatus for quantitative water and gas extraction from fluid inclusion with an absorption-spectroscopic (CRDS) system for isotopic analysis of the released water amount. We apply for funding for the CRDS system and a PhD student to setup and calibrate the system and for the analysis of samples from the Sauerland stalagmites. Beyond the planned study, the fluid inclusion system has a vast range of potential applications in hydrology and paleoclimate.

流体包裹体是指矿物中含有的水和/或气体的小等分试样。它们是原始流体环境的遗迹，在适当的档案中可以提供对溶液d18 O和dD值及其随时间演变的见解。特别有前途的是一个应用程序的流体包裹体在洞穴沉积物，因为这个档案提供了一个很好的年龄控制，是无处不在的，在大多数大陆地区。来自Sauerland（德国）的洞穴沉积物生长于全新世，其碳酸盐d18 O值在很大程度上遵循这一时期的全球气候模式。d18 O值对8.2ka事件和小冰期（LIA）的响应不一致。流体包裹体对水的d18 O值具有约束作用，有助于弄清8.2ka事件和LIA期间碳酸盐d18 O值差异的原因。此外，Sauerland洞穴沉积物中的流体包裹体可用于重建德国全新世降水的同位素演化，并为自然变化及其对中欧气候的影响提供线索。我们打算将一套从流体包裹体中定量提取水和气体的装置与一套用于释放水量同位素分析的吸收光谱（CRDS）系统相结合。我们申请了CRDS系统的资金，并请了一名博士生来设置和校准系统，并对绍尔兰石笋样品进行分析。除了计划中的研究，流体包裹体系统在水文学和古气候方面有着广泛的潜在应用。

项目成果

A comparison of isotope ratio mass spectrometry and cavity ring‐down spectroscopy techniques for isotope analysis of fluid inclusion water

• DOI: 10.1002/rcm.8837
• 发表时间: 2020-07
• 期刊: Rapid Communications in Mass Spectrometry
• 影响因子: 2
• 作者: S. Graaf;H. Vonhof;Therese Weissbach;J. Wassenburg;E. Levy;T. Kluge;G. Haug