Paleoclimate reconstruction for the East African Rift from geochemical studies of mammalian teeth

根据哺乳动物牙齿的地球化学研究重建东非裂谷的古气候

• 批准号: 21870178
• 负责人: Professor Dr. Dieter F. Mertz, Ph.D.
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21870178?language=en
• 关键词: Paleoclimate; reconstruction; East; African; Rift

Fossil tooth enamel of hippopotamidae from three localities in the East African rift (Lake Albert, Lake Turkana, Olorgesailie) will be studied for stable isotopes (O, C), radiogenic isotopes (Sr, Nd, Pb) and trace elements. Screening for signs of alteration in tooth enamel using several mineralogical and geochemical methods will be a central task in this project. S18O-and 613C-values will be used to J O reconstruct 5 O-values and temperatures of palaeo-meteoric waters and habitat vegetation to constrain the palaeoclimate and its changes over time. Radiogenic isotopes and trace elements will be measured to test for correlations between these and the stable isotope palaeoclimate proxies with the aim to develop new proxies and to link tooth enamel composition with changing soil chemistry during a changing climate in East Africa. Results from the three localities will be correlated and combined to yield constraints on the hypothesis that the uplift of the Rwenzori Mountains influenced the climate in East Africa.

对东非裂谷地区三个地点(阿尔伯特湖、图尔卡纳湖、奥洛格塞利)的河马科化石牙釉质进行了稳定同位素(O、C)、放射性同位素(锶、钕、铅)和微量元素的研究。使用几种矿物学和地球化学方法筛选牙釉质中的变化迹象将是该项目的中心任务。S18O和613C值将用于重建古大气水和生境植被的5O值和温度，以约束古气候及其随时间的变化。将测量放射性同位素和微量元素，以测试它们与稳定的同位素古气候指标之间的相关性，目的是开发新的指标，并将牙齿釉质成分与东非气候变化期间不断变化的土壤化学联系起来。根据鲁文佐里山脉隆起影响东非气候这一假设，这三个地区的结果将相互关联并结合在一起，从而产生制约因素。