MRI: Acquisition of a Thermal Ionization Mass Spectrometer for Geochemical and Geochronological Applications

这项由主要研究仪器（MRI）项目授予的合同为俄亥俄州牛津市迈阿密大学多集热器热电离质谱仪的采购提供了51%的费用。该仪器将配备离子计数和负离子功能，并将有一个二级能量过滤器，用于需要高丰度灵敏度的测量。该仪器将用于测量各种同位素系统，包括Rb-Sr、Sm-Nd、U- th - pb、Re-Os、Pt-Os和U衰变系列核素，具有广泛的地球化学和地质年代学应用。该仪器将进行的具体研究领域包括：收敛边界的地幔富集过程；陨石撞击结构的鉴定和定年；洋岛玄武岩的来源；活动岩浆系统的成岩过程和时间尺度；粘土成岩作用的同位素定年；微生物过程和元素循环的同位素研究；双峰和非均质岩浆系统的成岩作用；大陆伸展背景下玄武岩源与作用的时空演化地层地层学与地层化学的应用单晶测年法；古土壤碳酸盐U-Pb定年。＊＊＊

0116033 Widom This award by the Major Research Instrumentation (MRI) program provides 51% of the cost for the acquisition of a multi-collector thermal ionization mass spectrometer at Miami University in Oxford, Ohio. The instrument will be equipped with ion counting and negative ion capabilities, and will have a second-stage energy filter for measurements requiring high abundance sensitivity. The instrument will be used for measurement of a variety of isotope systems, including Rb-Sr, Sm-Nd, U-Th-Pb, Re-Os, Pt-Os, and U decay-series nuclides, with a wide range of geochemical and geochronological applications. Specific research areas that will be pursued with the instrument include: mantle enrichment processes at convergent boundaries; identification and dating of meteorite impact structures; sources of ocean island basalts; petrogenetic processes and timescales in active magmatic systems; isotopic dating of clay diagenesis; isotopic studies of microbial processes and elemental cycling; petrogenesis of bimodal and heterogeneous magmatic systems; spatial and temporal evolution of basalt sources and processes in continental extensional settings; applications of tephrostratigraphy and tephrochemistry; single-crystal dating methods; and U-Pb dating of paleosol carbonates. ***