Aquisition of a Multi-Collector Thermal Ionization Mass Spectrometer at the Scripps Institution of Oceanography

这笔拨款提供了301,000美元，作为购买具有高丰度灵敏度、多个收集器和负离子能力的新型热电离质谱仪（TIMS）的部分费用支持。斯克里普斯海洋研究所将提供总设备采购成本的40%。该仪器将使这些研究人员能够继续目前的工作，应用同位素地球化学，并扩展到需要质量分辨率和负离子能力的系统，而目前的单一收集器TIMS不适合这些系统。这些增强的能力包括：海洋沉积物的Re/Os同位素系统，对古构造、气候、风化和海洋热液活动具有重要意义；火成岩的U/Th系列同位素，可用于了解岩浆发生和运输的时间尺度和过程，以及洋中脊玄武岩、岛弧安山岩和其他构造环境岩石的源物质化学组成。＊＊＊

9528787 Macdougall This grant provides $301,000 as partial support of the costs of acquiring a new thermal ionization mass spectrometer (TIMS) with high abundance sensitivity, multiple collectors and negative ion capabilities. Scripps Institute of Oceanography will provide 40% of the total equipment acquisition costs. This instrument will allow these investigators to continue there present work is applied isotope geochemistry as well as expand into systems which require the mass resolution and negative ion capabilities for which their current single collector TIMS is not suitable. These increased capabilities include, Re/Os isotope systematics of marine sediments which have implications for paleotectonics, climate, weathering and oceanic hydrothermal activity, and U/Th series isotopes in igneous rocks, which can be used to gain insight into the time scales and processes of magma genesis and transport as well as the chemical composition of source materials for mid-ocean ridge basalts, island arc andesites and rocks from other tectonic settings. ***