Dated speleothems, archives of the paleoenvironment

该研究的主要目标是：(1)研究控制洞穴生长和组成的基本机制；(2)获得古降水强度和古温度的高分辨率信息；(3)将洞穴主题建立为精确定年的档案，提供定量的古气候信息。Forschergruppe （FG）旨在完善石笋中稳定同位素和微量元素作为过去气候代用品的应用。通过实验室实验和在两个天然洞穴系统中确定可溶性相和档案之间的关系。这些实验的结合将为洞穴主题中气候信号的解释提供传递函数。此外，还将建立一种测量洞穴中流体包裹体中稀有气体的方法来重建洞穴温度。选取这两个洞穴的全新世石笋和埃米世石笋进行高分辨率研究。Forschergruppe由不同领域的专家组成，他们将为小组提供他们的专业知识（Th/ u测年，稳定同位素测量，矿物学分析，微量元素地球化学，14c测年和统计时间序列分析）。这些专家的密切合作保证了高度的协同作用。中央项目（ZPO）将协调联邦政府的工作。所有的Th/ u定年以及FG中的稳定同位素和微量元素测量都将在该项目中进行。ZPO将与FG的其他项目密切合作，对结果进行解释和建模。

The main goals of the proposed research are: (1) to investigate the fundamental mechanisms which control speleothem growth and composition, (2) to obtain high resolution information of the intensity of paleo-precipitation and probably paleo-temperature, and (3) to establish speleothems as a precisely dated archive providing quantitative paleoclimate information. The Forschergruppe (FG) aims to refine the application of stable isotopes and trace elements in stalagmites as proxies for climate in the past. The relationship between the soluble phase and the archive will be determined with lab experiments and in two natural cave systems. The combination of these experiments will deliver a transfer function for the interpretation of climate signals in speleothems. Additionally, a procedure to measure noble gases in fluid inclusions of speleothems to reconstruct the cave temperature will be developed. Selected Holocene and Eemian stalagmites from these two caves will be investigated at high resolution. The Forschergruppe consists of experts in different fields who will provide their know how (Th/U-dating, measurement of stable isotopes, mineralogical analyses, geochemistry of trace elements, 14C-dating and statistical time-series analysis) to the group. The very close collaboration of these experts promises a high degree of synergy. The central project (ZPO) will coordinate the work of the FG. All Th/U-datings as well as stable isotope and trace element measurements in the FG will be performed within this project. The results will be interpreted and modeled in ZPO in close collaboration with the other projects in the FG.