Acquisition of a Laser Ablation Single Collector High Resolution Inductively Coupled Plasma Mass Spectrometer

0079721 Ghazi通过主要研究仪器（MRI）计划提供的这笔赠款，部分支持格鲁吉亚州立大学地质系购买配备激光消融微探针的磁扇区电感耦合等离子体质谱仪（以下简称LA-HR-ICP-MS）的费用。 新的高分辨率仪器提供了更高的灵敏度和更低的检测限，用于分析溶液中或消融颗粒中所含的微量元素，而不是格鲁吉亚州目前不再生产的基于四极杆的仪器。 在深UV（193 nm波长）中操作的准分子激光器系统将提供比Nd-YAG激光器更好的与相对半透明的矿物（即石英）的耦合，提供更精细的光斑尺寸和跨光束宽度的更稳定的能量分布，并且提供光栅化激光束的能力。 LA-HR-ICP-MS系统提供了极大地提高流体包裹体中微量元素丰度测量的质量和数量的潜力，这是格鲁吉亚州该组的专长。 新的ICP-MS设施还将延续长期以来开放使用的传统，作为服务于美国东南部的分析设施，既可满足学术需求，也可供总部位于亚特兰大的朗讯科技公司的工业合作者使用。 这种学术-工业合作努力使格鲁吉亚州地质部门与朗讯科技公司之间形成了共生关系，朗讯为实验室的运作和学生的教育经验提供财政支持，格鲁吉亚州为朗讯的员工提供训练有素的毕业生。 将利用这一新设施开展的地球科学具体研究项目包括：研究伊朗境内特提斯蛇绿岩的岩石成因，以更好地了解大洋地壳的形成过程;对伟晶岩矿物中的流体包裹体进行稀土元素研究，以阐明水-岩相互作用及其在金属矿床形成中的作用;高压实验装药中微量元素的配分，阐明出露变质相的地球化学演化;对美国东南部沿海平原含水层的地下水样本进行微量元素分析，作为问题盐的指标，因农业和市政需要过度抽取新鲜地下水资源而造成的水入侵。

0079721GhaziThis grant, made through the Major Research Instrumentation (MRI) Program, provides partial support of the costs of acquiring a magnetic sector inductively coupled plasma mass spectrometer equipped with a laser ablation microprobe (hereafter referred to as LA-HR-ICP-MS) for the Department of Geology at Georgia State University. The new high resolution instrument offers increased sensitivity and lower detection limits for the analysis of trace elements in solution or contained in ablated particulates than the current and no longer manufactured quadrupole-based instrument at Georgia State. An excimer laser system operating in the deep UV (193 nm wavelength) will provide for better coupling with relatively translucent minerals (i.e. quartz) than do Nd-YAG lasers, offers a finer spot size and more stable energy profile across the beam width, and offers the ability to raster the laser beam. The LA-HR-ICP-MS system offers the potential to substantially improve the quality and quantity of measurements of trace element abundances contained within fluid inclusions, the specialty of this group at Georgia State. The new ICP-MS facility will also continue a long standing tradition of open use as an analytical facility serving the southeastern U.S. both for academic needs and use by industrial collaborators from Atlanta-based Lucent Technologies. This academic-industrial collaborative effort has resulted in a symbiotic relationship between the Georgia State Geology Department and Lucent Technologies, with Lucent providing financial support for operation of the lab and educational experiences for students and with Georgia State providing trained graduates for Lucent's workforce. Specific research projects in the geosciences that will utilize this new facility include: studies of the petrogenesis of Tethyan ophiolites exposed in Iran to better understand the process of oceanic crustal formation; rare earth element studies of pegmatite mineral-hosted fluid inclusions to shed light on water-rock interaction and its role in the formation of metalliferous deposits; trace element partitioning in high pressure experimental charges to elucidate the geochemical evolution of exposed metamorphic facies; and trace element analysis of groundwater samples from coastal plain aquifers of the southeastern U.S. as indicators of problematic salt-water intrusions caused by over pumping of fresh groundwater resources for agricultural and municipal needs.***