Acquisition of an Inductively Coupled Plasma Mass Spectrometer UV Laser Lab and Microcentric Nebulizer

这笔拨款为购买配备激光烧蚀微探针的新型高分辨率电感耦合等离子体质谱计（HR-ICP-MS）的费用提供部分支持。除了对许多火成岩岩石学家感兴趣的元素具有更高的灵敏度和更低的检测限外，磁扇形仪器还可以分辨一些微量元素的等压干扰，这些微量元素对研究地壳和地幔的演化非常重要，而四极ICP-MS无法分辨这些元素。将要进行的许多研究需要具有高灵敏度的HR-ICP-MS和激光烧蚀直接取样固体地质材料的能力（即太古代科马岩中橄榄石斑晶和钻石包裹体的微量元素分析以及MORB中亲铜和亲铁元素浓度的测定）。这样的研究对于我们了解地核、地幔和地壳的演化具有根本性的重要性。随着Daniel Schrag博士的加入，低温地球化学应用于古海洋学和古气气学研究的新维度将被添加到哈佛大学这个小组传统的硬岩石地球化学研究中。* * *

9726058 Rudnick This grant provides partial support of the costs of acquiring a new high resolution inductively coupled plasma mass spectrometer (HR-ICP-MS) equipped with a laser ablation microprobe. In addition to having higher sensitivity and lower detection limits for many elements of interest to igneous petrologists, magnetic sector instruments allow resolution of isobaric interferences with some trace elements that are important to study of the evolution of Earth's crust and mantle that are not resolvable with quadrupole ICP-MS. Many of the studies that will be undertaken require the sensitivity of a HR-ICP-MS and the capability of laser ablation for direct sampling of solid geological materials (i.e. trace element analyses of olivine phenocrysts in Archean komatiites and diamond inclusions and the determination of chalcophile and siderophile element concentrations in MORB). Such research is of fundamental importance to our understanding of the evolution of Earth's core, mantle and crust. With the addition to the faculty of Dr. Daniel Schrag, a new dimension of low temperature geochemistry as applied to paleoceanographic and paleoclimatological research will be added to the traditional hard rock geochemical studies of this group at Harvard. ***