Rhenium-Osmium Investigation of Western U.S. Magmatism

美国西部岩浆活动的铼锇调查

• 批准号: 9204780
• 负责人: William Hart
• 金额: --
• 依托单位: Miami University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1995-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204780&HistoricalAwards=false
• 关键词: Rhenium; Osmium; Investigation; Western; U.S.

Recent rhenium (Re)-osmium (Os) studies on a variety of magmatic products and source materials illustrate the importance of this system to resolving issues of magma and crust-mantle evolution. Preliminary results from a pilot Re-Os study of northwestern U.S. basalts illustrate that combined Re-Os, conventional isotope, and elemental data can help unravel the complexities of source- versus process-related effects. This work seeks to expand on the pilot study by investigating the Re-Os characteristics of well-documented suites of mafic and silicic extrusive rocks and crustal as well as lithologies from the northwestern and southwestern United States. The results will help to elucidate the details of mantle and crustal processes and evolution in the continental setting.

近年来对各种岩浆产物和源区物质的锇（Re）-锇（Os）研究表明，该体系对解决岩浆和壳幔演化问题具有重要意义。对美国西北部玄武岩进行的Re-Os试点研究的初步结果表明，结合Re-Os，常规同位素和元素数据可以帮助解开源与过程相关效应的复杂性。这项工作的目的是扩大试点研究，调查的Re-Os特征的有据可查的套件的镁铁质和火山喷发岩和地壳以及岩性从美国西北部和西南部。研究结果将有助于阐明大陆背景下地幔和地壳过程和演化的细节。