Dated speleothems, archives of the paleoenvironment

本研究的主要目的是：（1）探讨控制洞穴沉积物生长和组成的基本机制;（2）获得高分辨率的古降水强度和古温度信息;（3）建立洞穴沉积物作为提供定量古气候信息的精确定年档案。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指标的应用。可溶相和档案之间的关系将通过实验室实验和两个天然洞穴系统来确定。这些实验的结合将提供一个传递函数的解释气候信号的洞穴。此外，将开发一种测量洞穴沉积物流体包裹体中惰性气体的程序，以重建洞穴温度。选择全新世和Eemian石笋从这两个洞穴将在高分辨率调查。研究小组由不同领域的专家组成，他们将向小组提供专门知识（Th/U测年、稳定同位素测量、矿物分析、微量元素地球化学、14 C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FG的工作。FG中的所有Th/U测年以及稳定同位素和微量元素测量将在本项目中进行。结果将与FG中的其他项目密切合作，在ZPO中进行解释和建模。

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.