SGER: Reconciling U-series Ages of Major and Accessory Phases

SGER：协调 U 系列主要阶段和附属阶段的年龄

• 批准号: 0649295
• 负责人: Kari Cooper
• 金额: $ 3.56万
• 依托单位: University of California-Davis
• 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: 2006-11-01 至 2007-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0649295&HistoricalAwards=false
• 关键词: SGER; Reconciling; series; Ages; Major

Understanding the dynamics of crustal magma systems requires knowledge of the types of of processes that lead to chemical changes and the timescales of such processes. This award will explore a novel approach to unravel why crystal ages that are obtained using U-series isotopic compositions of different mineral phases (accessory versus major phases) tend to yield discrepant ages. As part of the research plan, the investigators will measure a comprehensive suite of U-series crystal ages (i.e., in situ 238U-230Th ages in zircon and 226Ra-230Th and 238U-230Th ages in bulk separates of both major phases and zircon) in samples from rhyodacite domes at South Sister Volcano, Oregon Cascades, and rhyolite domes of the Tarawera volcanic complex, New Zealand. This one year of exploratory research will allow them to address the core question of the temporal relationship between major and accessory phase crystallization, while simultaneously laying the foundation for further work. The results of this exploratory project could have immediate and significant impact on the field because they will provide a much stronger context for interpretation of the growing body of age data for zircon and major phases; understanding the extent to which major and accessory phases are recording the same magmatic events is critical in order to make generalizations about how magma systems work from the studies of disparate systems that have been conducted to date.

了解地壳岩浆系统的动力学需要了解导致化学变化和此类过程的时间标度的过程类型。该奖项将探讨一种新的方法来解散为什么使用不同矿物相（附件与主要相）的U系列同位素组成获得的晶体年龄往往会产生差异年龄。 作为研究计划的一部分，研究人员将在锆石中衡量一套全面的U系列晶体年龄（即，锆石的原位238U-230年代，以及在主要阶段和氧化锆的大量分离中的226ra-230和238u-230年代，来自Southers Souther folcano cassol的样品中的样本和锆石的样品，以及Oregson Cases的ryegon casers and ryegon casher，Oregon cas的ry ry ry ry ryane and ry ryane and ry ry ry ry。复杂的新西兰。这项一年的探索性研究将使他们能够解决主要阶段和辅助阶段结晶之间时间关系的核心问题，同时为进一步的工作奠定了基础。 该探索性项目的结果可能会对该领域产生立即和重大影响，因为它们将为解释日益增长的锆石和主要阶段的年龄数据数据提供更强的背景；了解主要和附属阶段在多大程度上记录相同的岩浆事件对于为了概括岩浆系统如何从迄今为止进行的不同系统的研究中进行概括。