Acquisition of a Thermal Ionization Mass Spectrometer at the Berkeley Geochronology Center

伯克利地质年代学中心购置热电离质谱仪

• 批准号: 9601975
• 负责人: Kenneth Ludwig
• 金额: $ 20万
• 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: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9601975&HistoricalAwards=false
• 关键词: Acquisition; Thermal; Ionization; Mass; Spectrometer

9601975 Ludwig This grant, made through the Academic Research Infrastructure (ARI) Program, provides $200,000 as partial support of the costs of acquiring a state- of-the-art, high abundance sensitivity, thermal ionization mass spectrometer (TIMS) with multiple collectors, to be used for Uranium series and U-Th- Pb geochronology. Specific projects will include the dating of siliceous microfossils, pedogenic silica and carbonate, speleothems, corals and materials from archaeological sites such as tooth enamel using U-series methods for samples in the 20-500 Ka age range and U/Pb techniques for dating of pre-Mesozoic igneous accessory phases. These data should provide new age controls on the late Pleistocene marine stratigraphic record, the timing of pedogenesis and thus climate history of opal-bearing soils, high-resolution records of paleoclimate recorded in spleothem calcites and records of paleosea level based on accurate geochronologies determined from U-series dating of near-surface dwelling corals such as Acropora palmata. The new TIMS will also serve to calibrate Stanford-USGS SHRIMP ion microprobe analyses of individual zircons and will provide independent checks of 40Ar/39Ar dates of volcanic zircons and sanidines obtained using the existing noble gas mass spectrometer at the BGC. Funding of this TIMS will also shared with NSF's Archaeometry Program (SBR-9601068). ***

9601975 Ludwig 这项拨款是通过学术研究基础设施 (ARI) 计划提供的，提供 200,000 美元，作为购买一台最先进、高丰度灵敏度、具有多个收集器的热电离质谱仪 (TIMS) 的费用的部分支持，用于铀系列和 U-Th-Pb 地质年代学。 具体项目将包括使用 U 系列方法对 20-500 Ka 年龄范围内的样品进行硅质微化石、成土二氧化硅和碳酸盐、洞穴沉积物、珊瑚和牙釉质等考古遗址材料的测年，以及对前中生代火成岩副相进行测年的 U/Pb 技术。 这些数据应该提供对晚更新世海洋地层记录的新年龄控制、成土时间以及含蛋白石土壤的气候历史、在泥质方解石中记录的古气候的高分辨率记录以及基于通过近地表居住珊瑚（例如鹿角珊瑚）的U系列测年确定的精确地质年代学的古海平面记录。 新的 TIMS 还将用于校准斯坦福-美国地质勘探局 SHRIMP 离子微探针对单个锆石的分析，并对使用 BGC 现有惰性气体质谱仪获得的火山锆石和三尖晶石的 40Ar/39Ar 日期进行独立检查。 该 TIMS 的资金还将与 NSF 考古计划 (SBR-9601068) 共享。 ***