Clumped isotope thermometry applied to bivalve mollusks

团块同位素测温法应用于双壳类软体动物

• 批准号: 164130552
• 负责人: Professor Dr. Jens Fiebig
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/164130552?language=en
• 关键词: Clumped; isotope; thermometry; applied; bivalve

Shells of bivalve mollusks from higher latitudes are high-potential recorders of environmental variability on seasonal to decadal time-scales. However, temperature estimates based on common oxygen isotope determinations (i.e. (18O-values) of shell carbonate suffer from the weakness that the exact oxygen isotopic composition of the seawater is unknown in most cases. Clumped isotope measurements on CO2 released from marine carbonates by acid digestion have been demonstrated to function as a new powerful paleothermometer, because the deviation between measured and stochastic mass 47/44 isotopologue distributions (as expressed by (47-values) is independent of the oxygen isotopic composition of the ambient water and exclusively controlled by temperature, given that the carbonates grew in equilibrium with the ambient water. We request funding for the installation of the clumped isotope technique for mass 47 measurements in CO2. In a next step, we will study the temperature – (47 relationship for CO2 extracted from calcitic and aragonitic mollusks. Finally, combined (47 and (18O measurements will be performed on shells of the long-lived A. islandica and the fast-growing M. edulis to reconstruct seasonal variations in temperature and freshwater input throughout selected time intervals of the Holocene (Allerød, Medieval Cimate Optimum, Little Ice Age).

来自较高纬度的双壳类软体动物的贝壳是季节性到衰老时间尺度上环境变异性的高潜力记录。季节的氧同位素组成已被证明是由（47个价值）表达的新的带有氧气的氧气表分布（ASS），与环境水的氧气组成无关。使用环境水。长期寿命的A.岛和快速增长的m。

项目成果

Clumped isotope analysis of carbonates: comparison of two different acid digestion techniques.

• DOI: 10.1002/rcm.6609
• 发表时间: 2013-07
• 期刊: Rapid communications in mass spectrometry : RCM
• 作者: U. Wacker;J. Fiebig;B. Schoene