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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

基本信息

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

项目摘要

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).

来自高纬度地区的双壳类软体动物壳是季节性到十年期时间尺度上环境变化的高潜力记录者。然而，温度估计的基础上常见的氧同位素测定（即（18 O-值）的外壳碳酸盐遭受的弱点，确切的氧同位素组成的海水是未知的，在大多数情况下。海洋碳酸盐岩酸溶释放CO_2的成块同位素测量是一种新的有效的古温度计，因为测量值与随机质量47/44同位素分布之间的偏差（由（47-值）表示）与环境水的氧同位素组成无关并且仅受温度控制，假定碳酸盐与环境水平衡生长。我们请求提供资金，用于安装用于测量CO2质量47的集束同位素技术。在下一步中，我们将研究从方解石和文石软体动物中提取的CO2的温度-（47）关系。最后，将对长寿命的A. islandica和快速生长的M. edulis重建的季节性变化的温度和淡水输入整个选定的时间间隔的全新世（Allerød，中世纪Cimate最佳，小冰期）。