Acquisition of a Laser Fluorination Vacuum Line for Oxygen Isotope Ratio Measurement

9910129大笔赠款为华盛顿州立大学稳定同位素实验室购买激光氟化真空线的费用提供了部分支持。皮特·拉森在过去的20年里一直在高温地质系统的研究中使用硅酸盐矿物和岩石的稳定同位素分析。除了拉尔森，华盛顿州立大学的约翰·沃尔夫教授和拉里·迈纳特教授，以及爱达荷大学的丹尼斯·盖斯特博士，以及他们的研究生，将在他们各自的研究项目中使用激光氟化线。华盛顿州立大学增加的激光氟化系统将允许分析比目前实验室传统氟化系统分析的样品小一个数量级的样品。此外，传统上很难用传统装置测量的难熔矿物可以很容易地用新仪器分析。激光生产线将在现场建造，并将气体样本直接输送到现有的气源质谱仪波纹管中。新系统将用于一个正在进行的研究项目，该项目正在调查加那利群岛特内里费岛上洋岛玄武岩的演化。特内里费岛发音橄榄岩浆的初步氧同位素数据表明，蚀变围岩的同化作用在其演化过程中起着重要作用。然而，这项工作现在受到我们无法分析来自近玄武岩和声石的细小、个别斑晶的限制。该设施还将用于正在进行的其他研究项目，重点是成矿热液的来源和演化、岩浆作用及其与大陆环境中的构造作用和地壳演化的关系，以及太平洋西北部第三纪古土壤的古气候研究。***

9910129LarsonThis grant provides partial support of the costs of acquiring a laser fluorination vacuum line for the stable isotope laboratory at Washington State University. The PI, Peter Larson, has utilized stable isotope analyses of silicate minerals and rocks in his research on high temperature geologic systems for the past 20 years. In addition to Larson, Professors John Wolff (Co-PI) and Larry Meinert at Washington State University, and Dr. Dennis Geist at the University of Idaho, together with their graduate students, will utilize the laser fluorination line in their respective research programs.The addition of a laser fluorination system at WSU will allow for the analyses of samples an order of magnitude smaller than can be currently analyzed with the lab's conventional fluorination system. Additionally, refractory minerals which have been traditionally difficult to measure with a conventional set-up can be analyzed easily with the new apparatus. The laser line will be constructed on-site and will deliver gas samples directly into an existing gas source mass spectrometer bellows. The new system will be used in an ongoing research project that is investigating the evolution of ocean island basalts on Tenerife, Canary Islands. Preliminary oxygen isotope data for phonolitic magmas from Tenerife suggest that assimilation of altered wall rocks is important in their evolution. However, this work is now limited by our inability to analyze small, individual phenocrysts from the nearly-aphyric basanites and phonolites. This facility will also be used in other ongoing research projects that focus on the sources and evolution of ore-forming hydrothermal fluids, magmatism and its relationship to tectonism and crustal evolution in continental environments, and paleoclimate studies of Tertiary paleosols in the Pacific Northwest. ***