Geochronological and Geochemical Studies of Recently Dredged Basalt from the Ninetyeast Ridge: Testing the Hotspot Model

最近从九十东岭挖出的玄武岩的年代学和地球化学研究：测试热点模型

• 批准号: 0825147
• 负责人: Frederick Frey
• 金额: $ 42.24万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825147&HistoricalAwards=false
• 关键词: Geochronological; Geochemical; Studies; Recently; Dredged

The tectonic origins of the Ninetyeast Ridge (NER) will be investigated from geochrnonological/isotopic (Ar/Ar) measurements and from geochemical (Sr, Nd, Hf, and Pb isotopes) analyses of basalt samples collected from 7 DSDP and ODP drill sites, and from 23 dredged samples collected from NER in 2007. These analyses will address the origins of hotspots as the NER and if they are sourced beneath the ridge in the deep mantle or more shallow in the mid-upper mantle or sublithosphere. The data generated from this project will help advance geodynamical models of hotspots.Broader impacts: The broader impacts were viewed as limited in scope but will provide educational benefit and training for undergraduate and graduate students, and a JOI-sponsored middle school teacher.

九十东岭 (NER) 的构造起源将通过地质年代学/同位素 (Ar/Ar) 测量以及从 7 个 DSDP 和 ODP 钻探地点收集的玄武岩样本的地球化学（Sr、Nd、Hf 和 Pb 同位素）分析来研究，以及 2007 年从 NER 收集的 23 个疏浚样本。这些分析将解决 NER 热点的起源，以及它们是否是起源于深部地幔的山脊下方或更浅的中上地幔或岩石圈下。该项目生成的数据将有助于推进热点的地球动力学模型。 更广泛的影响：更广泛的影响被认为范围有限，但将为本科生和研究生以及 JOI 资助的中学教师提供教育效益和培训。