Acquisition and Upgrade of Research Equipment at Oxy-Anion Stable Isotope Consortium at Louisiana State University

这笔赠款支持购买路易斯安那州立大学(LSU)氧-阴离子稳定同位素联合体(OASIC)的下列设备：(1)同位素比质谱仪(IRMS)；(2)现有二氧化碳激光系统的光学更换部件；(3)CRDS水同位素分析仪；(4)热重分析仪(TGA)；和(5)气相色谱仪(GC)。IRMS将主要用于硫酸盐和硫化物样品的ä34S测量。光学部件正在更换一扇蒙上云层的窗户。CRDS、TGA和GC是实验室中三个严重缺失的设备。多年来，Pi和他的学生开发了新的湿化学方法和新的提取技术，开辟了几个研究前沿，包括(1)在6.35亿年前全球马里诺冰川发生后，同位素17O的硫酸盐非质量依赖(NMD)枯竭(由NSF地球生物学、低温地球化学和NASA天体生物学资助)；(2)北美新生代火山灰床中同位素17O的硫酸盐NMD浓缩(由NSF岩石学和地球化学资助)；(3)发现天然高氯酸盐中17O同位素的NMD富集物；(4)稀薄气体(O2和SF6)在温度梯度下的NMD行为。最近，由于设备老化和缺乏一些必要的仪器，OASIC？S的能力越来越受到限制。申请增加的内容将允许PI和研究生扩展和测试(1)非质量依赖的稳定同位素地球化学，(2)同位素分馏动力学(例如，硫酸盐中的O2信号)和(3)与材料和能源科学相关的矿物-气体氧同位素行为，这是路易斯安那州立大学的一项新校园倡议。此次升级将(1)通过监督安装、自我维护、操作和维修，以及通过与世界各地的研究人员合作，加强对不同文化和种族的博士后研究人员、研究生和本科生的动手和跨学科培训；(2)满足路易斯安那州立大学研究界在地质学、材料科学与工程和沿海研究方面的关键基础设施需求；以及(3)将路易斯安那州立大学OASIC打造为南方尖端稳定同位素实验室的首选地点。

This grant supports acquisition of the following pieces of equipment to be added to the Oxy-Anion Stable Isotope Consortium (OASIC) at Louisiana State University (LSU): (1) An isotope-ratio mass spectrometer (IRMS); (2) optical replacement parts for an existing CO2-laser system; (3) A CRDS water isotope analyzer; (4) A thermogravimetric analyzer (TGA); and (5) a Gas Chromatograph (GC). The IRMS will be used mainly for ä34S measurement of sulfate and sulfide samples. The optical parts are replacing a clouded window. The CRDS, TGA, and GC are three critically missing pieces of equipment in the laboratory.Over the years, PI and his students have developed new wet chemistry methods and new extraction techniques that have opened up several research frontiers, including (1) Sulfate non-mass-dependent (NMD) depletion of the isotope 17O in the immediate aftermath of the global Marinoan glaciation at ~635 million years ago (funded by NSF Geobiology & Low-Temperature Geochemistry and NASA Astrobiology); (2) Sulfate NMD enrichment of the isotope 17O in volcanic ash beds in Cenozoic North America (funded by NSF Petrology & Geochemistry); (3) The discovery of NMD enrichment of the isotope 17O in natural perchlorate; and (4) NMD behaviors for rarefied gases (O2 and SF6) under a thermal gradient. Recently, OASIC?s capacity has been increasingly constrained due to equipment aging and lack of some of the essential instruments. The requested addition will allow the PI and graduate students to expand and test several new ideas in (1) non-mass-dependent stable isotope geochemistry, (2) isotope fractionation kinetics (e.g. incorporation and elimination or O2 signal in sulfate), and (3) mineral-gas oxygen isotope behaviors related to material and energy sciences, a new campus-wide LSU initiative. The upgrade will (1) enhance hands-on and interdisciplinary training of culturally and ethnically diverse postdoctoral researchers, graduate and undergraduate students, through supervised installation, self-maintenance, operation, and repair, and through collaboration with researchers around the world; (2) fill in a critical infrastructure need at the interface of geology, material science & engineering, and coastal studies within LSU research community; and (3) establish LSU OASIC as the go-to place for a leading-edge stable isotope laboratory in the South.