Collaborative Research: Late Tertiary Silicic Volcanism in Eastern Oregon: Mirror Image to the Yellowstone Hotspot Trend

合作研究：俄勒冈州东部晚第三纪硅质火山活动：黄石热点趋势的镜像

• 批准号: 9220500
• 负责人: Anita Grunder
• 金额: $ 4.6万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9220500&HistoricalAwards=false
• 关键词: Collaborative; Research; Late; Tertiary; Silicic

The P.I.s to study the 10- to 5-Ma segment of silicic volcanism along the High Lava Plains. The first stage, the subject of this project, is a comprehensive mapping and high- precision 40Ar-39Ar dating study, supplemented by reconnaissance geochemical analyses of mainly the silicic volcanic rocks. A later stage will be aimed at the petrologic evolution of the silicic volcanic rocks, as warranted. The principle aims are: (1) to examine in detail the regional northwestward age progression of silicic volcanism, and to investigate whether age-progressive trends within silicic centers mimic the regional trend; and (2) to evaluate the composition of the silicic volcanic rocks as a function of space and time by geochemical analyses of date and (or) stratigraphically controlled samples. This will provide an unique series of time-composition slices through the evolution of a silicic volcanic province and will be a foundation for comparison to silicic volcanism along the Snake River-Yellowstone trend.

研究10到5 Ma的地壳段 火山活动沿着高熔岩平原。 第一阶段 这个项目的主题，是一个全面的测绘和高- 精确的40 Ar-39 Ar测年研究， 普查地球化学分析，主要是 火山岩 下一阶段将针对 火山岩的岩石学演化， 有正当理由其主要目的是：（1）详细研究 区域西北向年龄进程 火山作用，并调查年龄的进步趋势， （2）区域趋势;（3）区域趋势 评估火山岩的成分， 地球化学数据分析的时空函数 和（或）地层控制样品。 这将 提供一系列独特的时间组成片段， 火山区的演变，并将成为一个 作为与沿沿着 蛇河-黄石趋势。