Geochemical Variability of Near-Ridge and Intraplate Hotspot Volcanism

近洋脊和板内热点火山活动的地球化学变化

• 批准号: 8710905
• 负责人: Robert Duncan
• 金额: $ 4.49万
• 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: 1987
• 资助国家: 美国
• 起止时间: 1987-11-01 至 1990-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8710905&HistoricalAwards=false
• 关键词: Geochemical; Variability; Near; Ridge; Intraplate

Isotopic and trace element signatures in basaltic rocks from hotspot areas hold the key to the understanding of an important phenomenon, that is plume in the mantle. Mantle plums are believed to have created hot spots on the globe and with subsequent volcanism formed many sea mount chains. In this award, the principal investigator will analyze rocks from Cobb- Eickelberg seamount chain which is a product of near ridge hot spot activity and rocks from Marquesas islands formed by intraplate hot spot activity. These two localities are differnt in their geologic settings. the objective is to determine the hot spot structures, heterogeneity and the extent of lithospheric assimilation during melt production at these locations. This research will help us to understand mantle geochemistry at hot spot areas. Dr. Duncan is an excellent researcher with an established track record and the chance of success in this project is very high.

热点地区玄武岩中的同位素和微量元素特征是理解地幔中的一种重要现象的关键。地幔李子被认为在地球上形成了热点，随后的火山作用形成了许多海山链。在这个奖项中，首席研究员将分析科布-埃克尔伯格海山链的岩石，该链是近海脊热点活动的产物，以及由板内热点活动形成的马克萨斯群岛的岩石。这两个地方的地质环境不同。目的是确定这些地点熔体生产过程中的热点结构、非均质性和岩石圈同化程度。这一研究将有助于我们了解热点地区的地幔地球化学。邓肯博士是一位优秀的研究人员，有良好的研究记录，在这个项目中成功的机会非常高。