Acquisition of a Thermal Ionization Mass Spectrometer

这笔拨款提供了275,000美元，作为购买热电离质谱仪（TIMS）的部分费用支持，TIMS配备了多个法拉第收集器，离子计数和负离子能力以及外围设备，用于匹兹堡大学启动的放射性同位素地球化学计划的分析核心。PI， Capo和Stewart最近被匹兹堡大学聘用，该奖项包括了从大学获得仪器本身和实验室启动成本的大量成本分担。在匹兹堡获得一个新的TIMS将提供必要的分析能力，以进行一系列有趣的和最近资助的第四纪成土和生物地球化学过程研究。具体研究将包括利用Sr同位素确定大气和硅酸盐风化源在火山和沙漠土壤中Ca2+的相对贡献，进一步完善新生代海相碳酸盐岩的Sr同位素地层，以及利用Rb/Sr和Sm/Nd同位素系统作为火成岩作用和含矿流体运移的示踪剂。＊＊＊

9634801 Capo This grant provides $275,000 as partial support of the costs of acquiring a thermal ionization mass spectrometer (TIMS) equipped with multiple Faraday collectors, ion counting and negative ion capabilities and peripheral devices for use as the analytical centerpiece of the radiogenic isotope geochemistry program to be started at the University of Pittsburgh. The PI's, Capo and Stewart were recently hired by Pittsburgh and this award includes significant cost sharing from the University both for the instrument acquisition itself and in the form of laboratory startup costs. Acquisition of a new TIMS at Pittsburgh will provide the analytical capabilities necessary to conduct a range of interesting and recently funded Quaternary pedogenic and biogeochemical process studies. Specific studies will include the use of Sr isotopes to determine the relative contribution of atmospheric and silicate weathering sources of Ca2+ in volcanic and desert soils, further refinement of the Sr isotope stratigraphy of Cenozoic marine carbonates and the use of Rb/Sr and Sm/Nd isotope systematics as tracers of igneous petrogenesis and ore-bearing fluid migration. ***