Facility Support: Multi-User Facility for U-Th-Pb Geochronology Utilizing a Laser-Ablation Multicollector ICPMS

设施支持：利用激光烧蚀多接收器 ICPMS 进行 U-Th-Pb 地质年代学的多用户设施

• 批准号: 0443387
• 负责人: George Gehrels
• 金额: $ 34.65万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0443387&HistoricalAwards=false
• 关键词: Facility; Support; Multi; User; Th

EAR-0443387GehrelsThis award supports the development and operation of a U-Th-Pb geochronology lab (the Arizona LaserChron Center) that utilizes a multicollector ICP mass spectrometer (from GV Instruments) coupled with a 193 nm excimer laser (from New Wave Research). These instruments are capable of generating U-Th-Pb ages rapidly (40 per hour), with a precision of 2-3% (2-sigma), utilizing a beam size of 10 to 50 microns. This rapid throughput is optimal for applications that require generation of large data sets (e.g., detrital zircon provenance studies). The spatial resolution provided by laser ablation also provides a powerful tool for unraveling complex growth/disturbance histories commonly encountered in igneous and metamorphic terranes. The laboratory is presently able to routinely conduct U-Th-Pb age determinations on zircon, sphene, monazite, and monazite inclusions in garnet grains, and efforts to develop analytical methods for analysis of apatite, rutile, and xenotime are ongoing. We anticipate generating ~50,000 U-Th-Pb ages per year in support of ~50 different projects. Students are encouraged to use the facility, and funds are available to support student involvement. We also encourage use of the instrument in a classroom setting as it can be operated remotely with simultaneous displays of laser excavation and age calculation.

Gehrels-0443387 Gehrels该奖项支持U-Th-Pb地质年代学实验室（亚利桑那州LaserChron中心）的开发和运营，该实验室利用多接收器ICP质谱仪（来自GV仪器）与193 nm准分子激光器（来自New Wave Research）耦合。 这些仪器能够快速产生U-Th-Pb年龄（每小时40个），精度为2-3%（2-sigma），使用10至50微米的光束尺寸。 这种快速吞吐量对于需要生成大数据集的应用（例如，碎屑锆石来源研究）。 激光烧蚀提供的空间分辨率也提供了一个强大的工具来解开复杂的增长/扰动历史中常见的火成岩和变质岩石。 该实验室目前能够对石榴石颗粒中的锆石、辉石、独居石和独居石包裹体进行常规U-Th-Pb年龄测定，并正在努力开发用于分析磷灰石、金红石和磷钇矿的分析方法。 我们预计每年产生约50，000个U-Th-Pb年龄，以支持约50个不同的项目。 鼓励学生使用该设施，并提供资金支持学生参与。 我们还鼓励在教室环境中使用该仪器，因为它可以远程操作，同时显示激光挖掘和年龄计算。