Continued Technical Support for the W. M. Keck Isotope Laboratory

这笔拨款为亚利桑那大学的一名技术人员提供了8万美元的两年部分工资支持，该技术人员负责监督操作和维护，培训新用户，并利用W.M. Keck同位素实验室的热电离质谱仪（TIMS）和电感耦合等离子质谱仪（ICP-MS）开发地球化学分离和质谱技术。本实验室积极应用同位素资料研究地壳、地幔演化与成矿机制。具体的例子包括美国西南部辉钼矿的Re/Os同位素定年以约束成矿时代，基性-超基性杂岩中铂族元素（PGE）矿床的Re/Os同位素表征以及墨西哥构造的地球化学和地质年代学研究。该小组还开展了激光烧蚀与ICP质谱耦合的开发工作，ICP质谱是一种新兴的、有潜力的分析技术，用于固体地质样品中微量元素分布的微观研究。* * *

9708361 Ruiz This grant provides $80,000 two-years partial salary support for a technician at the University of Arizona to oversee operations and maintenance, train new users and develop geochemical separations and mass spectrometric techniques utilizing both the thermal ionization mass spectrometer (TIMS) and the inductively coupled plasma mass spectrometer (ICP-MS) in the W.M. Keck Isotope Laboratory. This lab is actively applying isotopic data to elucidate mechanisms of crustal and mantle evolution and metallogenesis. Specific examples include, Re/Os isotopic dating of molybdenite to constrain metallogenic epochs in the southwestern U.S., Re/Os isotopic characterization of platinum group element (PGE) deposits in mafic-ultramafic complexes and geochemical and geochronologic studies of the tectonics of Mexico. This group is also conducting developmental work on coupling laser ablation with ICP mass spectrometry, a newly burgeoning and potentially promising analytical technique for micro-scale studies of trace element distributions in solid geologic samples. ***