Collaborative Research: Development of Improved Zircon Standards for SIMS and LA-ICP-MS U-Pb Geochronology using CA-TIMS Pre-Treatment
合作研究:使用 CA-TIMS 预处理开发改进的 SIMS 和 LA-ICP-MS U-Pb 地质年代学锆石标准品
基本信息
- 批准号:0549603
- 负责人:
- 金额:--
- 依托单位:
- 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:2006-06-15 至 2008-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Partially open system behavior is a major factor limiting accuracy in zircon U-Pb geochronology. The recently developed chemical abrasion TIMS (CA-TIMS) of Mattinson (2005) involving thermal annealing of radiation damage prior to partial dissolution experiments through a series of increasingly aggressive leaching steps shows great promise as technique for complete removal (during early dissolution steps) of high-U, Pb-loss domains within near-concordant zircon populations. Microbeam techniques such as SIMS and LA-ICP-MS rely on external standardization to well-characterized zircon for which closed system behavior has been demonstrated on the basis of multi-grain TIMS analyses. The goals of this project are twofold: 1) to test the hypothesis that aliquots of zircon characterized and cleaned-up with the CA-TIMS method function as better monitors of microbeam instrument behavior than extant untreated aliquots which are affected by minor Pb loss; 2) to produce large aliquots of treated quasi-synthetic zircon standards for distribution amongst SIMS and LA-ICP-MS labs to improve the external precision of in situ analyses of unknown samples. A suite of improved zircon standards will be distributed amongst SIMS and LA-ICP-MS labs alike representing a significant service to the geochronologic community. The project provides support for an early career geoscientist (Hourigan). Furthermore, the analytical budget provides facilities support for day-to-day operation of the UCSB Isotope Ratio Mass Spectrometry Lab which is staffed by multiple graduate students. Undergraduates will benefit through participation in analytical work.
部分开放系统行为是制约锆石U-Pb年代学精度的主要因素。Mattinson(2005年)最近开发的化学磨蚀TIMS(CA-TIMS)涉及在部分溶解实验之前通过一系列越来越积极的浸出步骤对辐射损伤进行热退火,显示出作为完全去除(在早期溶解步骤期间)近整合锆石群中高U、Pb损失域的技术的巨大前景。微束技术,如西姆斯和LA-ICP-MS依赖于外部标准化,以充分表征锆石,其封闭系统行为已被证明的基础上,多晶粒TIMS分析。本项目的目标是双重的:1)测试假设,即用CA-TIMS方法表征和净化的锆石等分试样比受少量Pb损失影响的现存未经处理的等分试样作为微束仪器行为的更好的监测器; 2)生产大等份的经处理的准合成锆石标准品,用于在西姆斯和LA-ICP-1之间分配。MS实验室提高未知样品原位分析的外部精度。一套改进的锆石标准将分发给西姆斯和LA-ICP-MS实验室,这对地质年代学界来说是一项重要的服务。 该项目为早期职业地球科学家(Hourigan)提供支持。此外,分析预算为UCSB同位素比质谱实验室的日常运作提供设施支持,该实验室由多名研究生组成。本科生将通过参与分析工作受益。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Jeremy Hourigan其他文献
Jeremy Hourigan的其他文献
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{{ truncateString('Jeremy Hourigan', 18)}}的其他基金
MRI: Acquisition of a triple-quadrupole ICP-MS and sample introduction hardware for multidisciplinary research and teaching
MRI:购买三重四极杆 ICP-MS 和样品引入硬件,用于多学科研究和教学
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2216460 - 财政年份:2022
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- 批准号:
0819709 - 财政年份:2008
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