MRI: Acquisition of a Thermal Ionization Mass Spectrometer for High-Precision Geochronology and Isotope Geology

MRI：购买热电离质谱仪进行高精度地质年代学和同位素地质学

• 批准号: 1726099
• 负责人: Blair Schoene
• 金额: $ 52.25万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1726099&HistoricalAwards=false
• 关键词: MRI; Acquisition; Thermal; Ionization; Mass

Determining the rates of geologic processes over thousand to billion year time scales requires the determination of isotopic ratios with very high precision on a wide range of Earth materials. Precise and accurate measurements of radioactive and radiogenic isotopes provides the basis for geochronology, which in addition to other types of isotopic data, can be used to unravel ties between causation versus coincidence in events such as mass extinctions, climate change, the pace of biotic evolution, and provide a more detailed understanding of the physics of mass and heat transfer that drive plate tectonics and volcanic eruptions. This MRI grant provides funds to purchase a thermal ionization mass spectrometer (TIMS) in the Department of Geosciences at Princeton University, which focuses on measuring high-precision isotope ratios that are essential for determining the age of Earth materials and understanding the rates of geologic processes. This new instrument will supplement an existing TIMS managed by PI Schoene. The enhanced capacity provided by the new TIMS will permit the lab to broaden its research focus and secure ties between the research programs of Schoene and co-PI Higgins, as well as other faculty in the department and within a broad geoscience community. The new TIMS will serve to 1) increase the capacity of a world-class U-Pb lab to host and train internal and external users from a broad spectrum of universities, including liberal arts colleges, 2) devote more time to exploring and exploiting new isotopic systems, 3) further increase the precision and accuracy of these techniques to benefit the geochronologic and isotope geology communities, 4) expand the devotion of Schoene and Higgins towards integrating research and class work, and 5) build on existing programs led by Higgins to engage and educate local urban communities in the dangers of, and science behind, environmental and anthropogenic Pb contamination. This MRI grant provides funds to purchase a new TIMS in the Department of Geosciences at Princeton University to be managed by PI Schoene and co-PI Higgins, which will supplement an existing TIMS currently managed by Schoene. The new instrument will be housed in an existing space adjacent to state-of-the-art geochemistry facilities, be supported by existing clean labs for sample preparation, and also supplement the research capabilities of existing ICPMS facilities led by Higgins. The existing TIMS and ICPMS facilities have developed a track record of serving the demand for geochronologic and isotopic data within a broad geoscience community; they also devote substantial time to establishing techniques and workflows that both ensure the precision and accuracy of routine methods and enable new science. The focus of the current TIMS is on the numerous applications of U-Pb geochronology; the new instrument will expand those capabilities and also devote time to measuring stable and radiogenic Sr and Ca isotopes. The new instrument will also permit the PIs to host more external users, thus broadening the impact of the laboratories and providing much-needed high-precision geochronologic and isotopic data to a wide-range of users from Universities that may not have the infrastructure to host similar laboratories. Targeted Geoscience research projects range from understanding the evolution of continents and volcanic systems, calibrating rates of climate change in the deep past through geochronology of stratigraphic sections, extending the reach of ice-core records for tracking atmospheric composition beyond a million years ago, measuring the flux of flood basalt eruptions and understanding their environmental impact, and increasing the precision and accuracy of geochronology of Lunar samples.

确定地质过程的速率超过了数千至十亿年的时间尺度，需要在广泛的地球材料上确定同位素比的精度很高。放射性和放射性同位素的精确测量提供了地质学的基础，除其他类型的同位素数据外，它们可用于揭示质量变化，气候变化，生物进化的速度，更详细的大规模传播的范围和较详细的盘旋的事件中的因果关系与巧合之间的关系。该MRI赠款提供了在普林斯顿大学地球科学系购买热电离质谱仪（TIMS）的资金，该系的重点是测量对确定地球材料时代和了解地质过程率的高精度同位素比率。该新工具将补充Pi Schoene管理的现有TIM。新的TIMS提供的增强能力将使实验室能够扩大其研究重点，并确保Schoene和Co-Pi Higgins的研究计划以及该系的其他教职员工之间以及广泛的地球科学界之间的联系。 新的TIMS将为1）提高世界一流的U-PB实验室的能力，包括各种各样的大学（包括文科学院），培训和培训内部和外部用户，2）花更多的时间探索和利用新的同位素系统，3）进一步增加这些技术的准确性和准确性，以使这些技术的准确性和准确性增长，从而使这些技术和息肉群体扩展到扩展地球群体，4）4）4）4）4）4）4）4）研究和班级工作以及5）基于希金斯（Higgins）领导的现有计划，旨在使当地城市社区受到环境和人为PB污染的危险和科学的危险。该MRI赠款提供了在普林斯顿大学地球科学系购买新的TIMS的资金，由Pi Schoene和Co-Pi Higgins管理，这将补充由Schoene当前管理的现有TIMS。新仪器将安置在与最先进的地球化学设施相邻的现有空间中，并得到现有的清洁实验室的支持，以进行样品准备，还可以补充希金斯领导的现有ICPMS设施的研究能力。 现有的TIMS和ICPMS设施已开发出满足广泛地球科学社区中对测量和同位素数据需求的往绩；他们还花了大量时间来建立技术和工作流程，以确保常规方法的精确性和准确性以及实现新科学。当前TIM的重点是U-PB地质学的众多应用；新仪器将扩大这些功能，并花费时间来测量稳定和放射性的SR和CA同位素。新工具还将允许PI托管更多的外部用户，从而扩大实验室的影响，并向来自大学的大量用户提供急需的高精度地球文量和同位素数据，这些用户可能没有基础设施来托管类似的实验室。有针对性的地球科学研究项目范围从了解大陆和火山系统的演变，通过地层剖面的地质学来校准气候变化的速度，扩展了一百万年前跟踪大气组成的冰核记录的范围，以超过一百万年前，衡量了洪水底层爆发的洪水爆发的范围，并了解其环境的影响和精确的地理位置和精确性，并确定了lun and lun and lun and lun。

项目成果

U–Pb ID-TIMS geochronology using ATONA amplifiers

• DOI: 10.1039/d0ja00135j
• 发表时间: 2020-06
• 期刊: Journal of Analytical Atomic Spectrometry
• 影响因子: 3.4
• 作者: D. Szymanowski;B. Schoene