Acquisition of a Noble Gas Thermochronometry Laboratory at Berkeley Geochronology Center

收购伯克利地质年代学中心的稀有气体测温实验室

• 批准号: 0618219
• 负责人: David Shuster
• 金额: $ 14.98万
• 依托单位: Berkeley Geochronology Center
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0618219&HistoricalAwards=false
• 关键词: Acquisition; Noble; Gas; Thermochronometry; Laboratory

0618219ShusterThis Major Research Instrumentation (MRI) Program grant supports establishment of a noble gas thermochronometry laboratory (NGTL) at the Berkeley Geochronology Center. The NGTL would focus on (U-Th)/He and 4He/3He dating of accessory phases to establish their low temperature ( 200 degrees C) thermal histories. Equipment to be purchased includes a binocular microscope, components to a build gas extraction system including diode laser and ultrahigh vacuum laser extraction chamber, components to build an ultra high vacuum gas purification system and a quadrupole mass spectrometer. The laser heated gas extraction and purification system would be used to liberate He from samples which would subsequently be analyzed on the quadrupole mass spectrometer. Following gas analysis, recovered samples would be dissolved and solutions would be spiked for isotope dilution measurements of U and Th concentrations via ICP-MS analysis at available off campus facilities. NGTL capabilities for quantitative evaluation of the thermal histories of rocks below 200 degrees C will be used to establish timescales and rates of processes taking place in the uppermost few kilometers of terrestrial planets. A range of PI and collaborative research will be facilitated including: (i) quantifying the rates and timescales of exhumation, erosion and tectonism in mountainous landscapes and testing possible influences that climate variability has on relief, (ii) constraining the temperatures and timescales of near-surface planetary impacts and long-duration residence temperatures of the Martian meteorites while on Mars, (iii) quantifying the timescales and rates of chemical weathering at Earth's surface, (iv) constraining long-term residence timescales of samples near Earth's surface, and (v) studying noble gas diffusion kinetics in different materials to advance basic understanding of solid-state diffusion and potentially identify novel applications of the noble gases to the Earth and planetary science. Graduate and postdoctoral researchers will be trained in low-temperature thermochronometry research methods and the PI's plan targeted recruitments of women and minorities for graduate and postdoctoral fellowships.***

0618219舒斯特这主要研究仪器（MRI）计划拨款支持建立一个惰性气体热测年实验室（NGTL）在伯克利地质年代学中心。 NGTL将侧重于对副相进行（U-Th）/He和4 He/3 He定年，以确定其低温（200摄氏度）热历史。 拟采购的设备包括一台双目显微镜、一套气体提取系统的部件（包括二极管激光器和双极真空激光提取室）、一套超高真空气体净化系统的部件和一台四极质谱仪。 激光加热气体提取和净化系统将用于从样品中释放He，随后在四极质谱仪上进行分析。 气体分析后，回收的样品将被溶解，溶液将被加标，通过ICP-MS分析在校外设施进行同位素稀释测量U和Th浓度。 NGTL对低于200摄氏度的岩石热历史进行定量评估的能力将用于确定在类地行星最上面几公里处发生的过程的时间尺度和速率。 一系列PI和合作研究将得到促进，包括：（一）量化山地地貌的剥露、侵蚀和构造作用的速率和时间尺度，并测试气候变化对地形的可能影响，（二）限制行星近地表撞击的温度和时间尺度以及火星陨石在火星上的长期驻留温度，（iii）量化地球表面化学风化的时间尺度和速率，（iv）限制样品在地球表面附近的长期停留时间尺度，以及（v）研究惰性气体在不同材料中的扩散动力学，以推进对固体-状态扩散，并可能确定惰性气体在地球和行星科学中的新应用。 研究生和博士后研究人员将接受低温热计时研究方法的培训，PI计划有针对性地招募妇女和少数民族作为研究生和博士后研究金。