Acquisition of a 213nm laser and cathodoluminescence detector for microanalysis of zircon and other Earth materials

0824974Kohn这项提案寻求资金，以在博伊西州立大学购买一台213 nm激光和阴极发光(CL)探测器，用于地质年代学和微量元素研究。CL探测器将固定在目前部署在物理系的JEOL JSM-T300扫描电子显微镜上。该仪器目前有SE、BSE和EDS探测器，包括数字成像功能的升级，以允许扫描电子显微镜与CL探测器接口。扫描电子显微镜化学发光将被用来瞄准锆石，以便随后用所请求的激光进行激光消融(LA)电感耦合等离子体质谱(ICPMS)。本文还提出了一种化学发光探测器，用于靶向石英中的钛测量微区。激光将被固定在一个将要购买的四极等离子体质谱上，该质谱仪将安装在地科系，用于锆石、石榴石、独居石、碳酸盐和磷酸盐化石的分析。该仪器将用于正在进行的NSF EAR资助的研究项目。主要目的是：1)用CL-SEM和ID-TIMS相结合的方法进行锆石U-Th-Pb原位定年，2)用LA-ICP-MS进行石榴石和其他硅酸盐分带分析，以推断成岩过程和更好地了解高分辨率的放射性同位素组成，3)独居石U-Th-Pb衰变系列测年，4)碳酸盐和化石U系列定年，5)有孔虫元素分带分析，以确定古温度和古营养元素分布，以及6)石英CL成像，用于后续的钛温度测定。这些测量的基本主题包括更好地了解古生代气候变化、碎屑岩来源和地层学、岩石起源和历史，以及古营养素分布和循环。CL仪器将并入物理系现有的扫描电子显微镜系统，该系统将进行升级，以支持数字成像。扫描电子显微镜系统将继续由目前资金紧张的技术人员维护。报酬费用将作为CL使用费的附加费。LA系统将与新购买的电感耦合等离子体质谱仪安装在一个新装修的实验室中。将通过大学资金额度聘请一名全职技术人员。联合PI Crowley将与技术人员一起管理LA-ICP-MS，包括维护和培训。使用费按小时收费。该仪器将通过现有的以研讨会和实验室参观为特色的推广方案，作为各级学生培训的基础。通过目前的外展工作，已有100多名大学预科学生被曝光。最近，PI因将本科生纳入实验室工作而获得了年度本科生研究导师奖。该工具将纳入教学课程，并将通过文献和合作努力传播研究成果。***

0824974Kohn This proposal seeks funding to acquire a 213 nm laser and cathodolminescence (CL) detector for geochronologic and trace element research at Boise State University. The CL detector will be affixed to an existing JEOL JSM-T300 SEM currently deployed in the Department of Physics. The instrument currently has SE, BSE, and EDS detectors Upgrades for digital imaging capabilities are included to allow the SEM to interface with the CL detector. The SEM-CL will be used to target zircons for subsequent laser ablation (LA) ICP-MS with the requested laser. The CL detector is also proposed for targeting Ti measurement domains in quartz. The laser will be affixed on a to-be-purchased quadrapole ICP-MS to be housed in the Department of Geosciences for zircon, garnet, monazite, carbonate and phosphatic fossil analysis. The instrumentation will be employed for on-going NSF EAR-funded research projects. Major objectives in clued: 1) in situ U-Th-Pb zircon dating using CL-SEM coupled with ID-TIMS allowing mineral age determination, 2) garnet and other silicate zoning analysis using LA-ICP-MS to infer petrogenic processes and better understand high-resolution radiogenic isotope compositions, 3) monazite dating using U-Th-Pb decay series, 4) carbonate and fossil dating using U-series, 5) foraminifera elemental zoning analysis to determine paleotemperatures and paleonutrient distributions, and 6) quartz CL imaging for subsequent Ti-thermometry. Underlying themes among these measurements include a better understanding of Paleozic climate changes, clastic rock provenance and stratigraphy, rock origins and histories, and paleonutrient distributions and cycling. The CL instrumentation will be incorporated into existing SEM system housed on the Department of Physics which will be upgraded to support digital imaging. The SEM system will continue to be maintained by currently hard-funded technicians. Remuneration costs will be added as a surcharge for CL usage. The LA system will be coupled with the newly-purchased ICP-MS in a newly-renovated laboratory. A full-time technician will be hired through University funding lines. Co-PI Crowley will administer the LA-ICP-MS to include maintenance and training, along with the technician. An hourly rate will be charged for usage. The instrumentation will serve as the basis for student training at all levels through existing outreach programs which feature seminars and laboratory tours. Over 100 pre-college students have been exposed through the current outreach efforts. The PI recently received an Undergraduate Research Mentor of the Year award for incorporating undergraduates in laboratory efforts. The instrumentation will be incorporated into teaching curricula and research results will be disseminated through the literature and through collaborative efforts. ***