MRI: Acquisition of a Multiple Collector ICPMS for Geochemical and Cosmochemical Studies at DTM

来自主要研究仪器（MRI）计划的资金将用于在华盛顿卡内基研究所（CIW）购买多收集器电感耦合等离子体质谱仪（MC-ICP-MS）和激光烧蚀（LA）微探针。该仪器将增加并最终取代10年前在NSF-MRI-EAR计划的支持下购买的两台现有的第一代MC-ICP-MS仪器。这些仪器已不再由制造商提供支持。与CIW现有的第一代仪器相比，先进的MC-ICP-MS和193nm LA微探针将在质量检测灵敏度、质量分馏稳定性、探测器精度、可靠性和易用性方面取得实质性改进。新的LA-MC-ICP-MS将支持一系列宇宙和地球化学研究，这些研究需要对碱金属、过渡金属、铂族（PGE）和稀土元素的同位素比率进行微空间分辨率高精度分析。MC-ICP-MS还将允许卡内基同位素地球化学博士后项目继续使用最新的等离子体质谱技术。新仪器将促进的具体研究领域包括：1)早期太阳星云的化学和同位素非均质性程度及其对类地行星总体组成的影响；2)在地球形成过程中，金属-硅酸盐在星子上分选的时间和金属-硅酸盐平衡的程度？年代的核心;3) Re-Os同位素和PGE丰度变化作为与大陆形成有关的地幔分异历史和过程的记录；4)形成地幔成分非均质性的过程

0820771CarlsonFunds from this Major Research Instrumentation (MRI) Program grant will support acquisition of a multicollector inductively-coupled plasma mass spectrometer (MC-ICP-MS) and laser ablation (LA) microprobe at the Carnegie Institution of Washington (CIW). The instrument will augment and ultimately supplant two existing first generation MC-ICP-MS instruments purchased 10 years ago with support from the NSF-MRI-EAR program. These instruments are no longer supported by the manufacturer. A state-of-the-art MC-ICP-MS and a 193 nm LA microprobe will allow for substantial improvements in mass detection sensitivity, mass fractionation stability, detector accuracy, reliability, and ease of use compared to existing first generation instruments at CIW. A new LA-MC-ICP-MS would support a range of research in cosmo- and geochemistry requiring microspatially resolved high precision analyses of isotope ratios of alkali metals, transition metals, Platinum group (PGE) and rare earth elements. The MC-ICP-MS will also allow for continuation of the Carnegie isotope geochemistry postdoctoral program using the latest plasma mass spectrometry techniques. Specific research areas that will be fostered with the new instrument will include investigations of: 1) the degree of chemical and isotopic heterogeneity in the early solar nebula and its influence on the bulk composition of the terrestrial planets; 2) the timing of metal-silicate fractionation on planetesimals and the degree of metal-silicate equilibrium during formation of Earth?s core; 3) Re-Os isotopic and PGE abundance variations as recorders of the history and processes of mantle differentiation in relation to continent formation; and 4) processes that create compositional heterogeneity in the mantle.***