Acquisition of a Thermal Ioniztion Mass Spectrometer

这项资助是通过学术研究基础设施（ARI）计划获得的，提供25万美元作为购买具有离子计数能力的热电离质谱仪（TIMS）的一半费用支持，用于火成岩同位素研究、构造研究的热年代学和地质年代学以及怀俄明大学的环境同位素地球化学。该仪器将取代1984年购买的有点过时的VG TIMS，但最近在1989年进行了升级。但是，自从升级以来，仪器一直受到技术问题的困扰，这些问题直到最近（1993年）才得到纠正并产生了数据。怀俄明大学的50%匹配是一次性1800万美元国家支持的地质建筑扩建/改进的一部分。将利用这一新的TIMS功能的具体研究将包括通过检查Pb、Sr和Nd同位素特征来研究拉勒米斜长岩复岩和阿留申和加勒比弧岩浆的岩石成因，基于热年代学和地质年代学技术研究美国西部的构造演化，以及地下水水文和风化过程的Sr和Nd同位素研究。* * *

9601783 Frost This grant, made through the Academic Research Infrastructure (ARI) Program, provides $250,000 as one-half support of the costs of acquiring a thermal ionization mass spectrometer (TIMS) with ion counting capabilities for use in isotopic studies of igneous petrogenesis, thermochronology and geochronology for tectonic studies, and environmental isotope geochemistry at the University of Wyoming. The instrument will replace a somewhat antiquated VG TIMS purchased in 1984 but more recently upgraded in 1989. However, since the upgrade, the instrument has been plagued with technical problems that have only more recently (1993) been rectified and data produced. The 50% match from the University of Wyoming is part of a one-time, $18M state supported Geology building expansion/improvement. Specific studies that will utilize the capabilities of this new TIMS will include research on the petrogenesis of the Laramie Anorthosite Complex and Aleutian and Caribbean arc magmas through examination of Pb, Sr and Nd isotopic signatures, the tectonic evolution of the Western U.S. based on thermochronologic and geochronologic techniques and Sr and Nd isotopic studies of groundwater hydrology and weathering processes. ***