Acquisition of a Sulfur Isotope-Ratio Mass Spectrometer

这笔拨款为印第安纳大学提供了部分支持，用于购买稳定同位素比质谱仪（SIRMS）的费用，包括外围样品导入和气体处理设备。sims将专门用于硫同位素分析，取代19年的。旧的核素质谱仪目前在印第安纳大学运行。这个新设施将由印第安纳-布卢明顿分校、伊利诺伊大学厄巴纳分校和密苏里大学哥伦比亚分校的研究人员共享。最先进的SIRMS可以分析比目前核素更小的气体样本（1微摩尔），从而大大扩展了对该区域组的分析可能性。该设施将为经济地质学、古海洋学、生物地球化学和硫同位素系统学等广泛研究提供数据。具体研究将包括对中大陆裂谷系统内热液矿体成因的硫同位素调查，缺氧海洋沉积物中有机质的物种特定硫同位素分析作为成岩过程的代用物，切萨皮克湾沉积物孔隙-水系统中硫的生物地球化学途径的表征，缺氧黑海沉积物中黄铁矿形成的古环境研究，以及亚硫酸盐体系中硫同位素分馏的实验研究。＊＊＊

9726264 Ripley This grant provides partial support to Indiana University for the costs of acquiring a stable isotope ratio mass spectrometer (SIRMS) with peripheral sample introduction and gas handling devices. The SIRMS will be dedicated to sulfur isotopic analyses, replacing the 19-yr. old Nuclide mass spectrometer currently operated at Indiana University. This new facility will be shared by researchers from Indiana-Bloomington, the University of Illinois at Champaign-Urbana and the University of Missouri- Columbia. State-of-the-art SIRMS allow analyses of much smaller gas samples ( 1 micromole) than currently possible on the Nuclide, thus greatly expanding the analytical possibilities for this regional group. This facility will provide data for a wide range of studies in economic geology, paleoceanography, biogeochemistry and sulfur isotope systematics. Specific studies will include sulfur isotopic investigations of the genesis of hydrothermal ore bodies within the Midcontinent Rift system, species specific sulfur isotopic analyses of organic compounds as proxies of diagenetic processes in anoxic marine sediments, characterization of the biogeochemical pathways of sulfur in Chesapeake Bay sediment pore-water systems, paleoenvironmental studies of pyrite formation in anoxic Black Sea sediments, and experimental studies of sulfur isotope fractionation in sulfosalt systems. ***