MARGINS Post-doctoral fellowship - Jeremy Boyce: Exploring the Record of Magmatic Volatiles in a Volcanic Arc via H, C, F, S, and Cl in Apatite

MARGINS 博士后奖学金 - Jeremy Boyce：通过磷灰石中的 H、C、F、S 和 Cl 探索火山弧中岩浆挥发物的记录

• 批准号: 0549082
• 负责人: Richard Hervig
• 金额: $ 20.8万
• 依托单位: Arizona State University
• 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: 2006-03-15 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0549082&HistoricalAwards=false
• 关键词: MARGINS; Post; doctoral; fellowship; Jeremy

AbstractAn underexploited tool for determining magmatic volatiles lies in measuring the chemistry of volatile-bearing igneous minerals. Specifically, apatite (nominally Ca5(PO4)3(OH,F,Cl)) incorporates the key elements H, C, F, Cl, and S and has previously been used to constrain Cl, F, and S concentrations in ancient magmas. Under this funding, the PIs propose to develop and apply the secondary ion mass spectrometer (SIMS, or ion microprobe) to measure variations in volatile element concentrations (in conjunction with REE and other trace elements) in apatites from extrusive rocks from the Costa Rica arc, where the type of material being subducted has been known to change over the past 60Ma. SIMS combines the ability to quantitatively measure all of the above-mentioned elements with unmatched spatial resolution (1um in depth profiling mode, 2um in point analysis mode). Intracrystalline zoning of volatiles may represent the evolution of one particular magma body while variations in apatite volatiles throughout the history of a particular volcanic setting may indicate changes in the source, important goals of the MARGINS program.Broader impacts include the fact that Boyce is a post-doc, that a new technique will be explored, that a museum exhibit will be created, and that SIMS work will be performed, helping with SIMS community infrastructure.

摘要测定岩浆挥发分的一个未被充分利用的工具是测定含挥发分的火成岩矿物的化学成分。具体地说，磷灰石(名义上是Ca5(PO4)3(OH，F，Cl))包含了H，C，F，Cl和S等关键元素，以前曾被用来限制氯、F和S在古代岩浆中的浓度。在这笔资金的资助下，PIS建议开发和应用二次离子质谱仪(SIMS，或离子微探测器)，以测量哥斯达黎加弧喷出岩石中磷灰石中挥发性元素浓度的变化(与稀土和其他微量元素一起)，已知被俯冲物质的类型在过去60 Ma发生了变化。SIMS将定量测量上述所有元素的能力与无与伦比的空间分辨率(深度剖析模式下为1um，点分析模式下为2um)结合在一起。挥发物的晶内分带可能代表一个特定岩浆体的演化，而磷灰石挥发物在特定火山环境历史上的变化可能表明来源的变化，这是边缘计划的重要目标。广泛的影响包括博伊斯是博士后，将探索一种新技术，将创建博物馆展览，并将执行SIMS工作，帮助SIMS社区基础设施。