Collaborative Research: Ocean Ridge Basalts with Convergent Margin Geochemical Affinities from the Southern Chile Ridge: Does Ridge Subduction Play a Role?

合作研究：来自智利南部海脊的具有汇聚边缘地球化学亲和力的洋脊玄武岩：海脊俯冲是否发挥作用？

• 批准号: 9504280
• 负责人: Emily Klein
• 金额: $ 9.52万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-11-01 至 1998-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9504280&HistoricalAwards=false
• 关键词: Collaborative; Research; Ocean; Ridge; Basalts

9504280 Klein This work involves laboratory and modeling studies of lavas recovered in 1993 from the axis of the southern Chile Ridge. Preliminary analyses reveal that a large proportion of samples recovered from over 400 km of this spreading center are enriched mid-ocean ridge basalts with trace element systematics that are highly unusual, showing geochemical afinities with arc, back-arc, and recycled continental materials. Preliminary modeling suggests they may be produced by melting of a mid-ocean ridge basalt source that has been variably contaminated by sediment and altered oceanic crust, possibly introduced at the adjacent subduction zone. ***

9504280克莱因这项工作涉及对1993年从智利南部山脊轴心回收的熔岩进行实验室和模拟研究。初步分析表明，在该扩张中心400多公里范围内回收的样品中，有很大一部分是富含微量元素系统的大洋中脊玄武岩，具有极不寻常的地球化学特征，具有弧形、弧后和再循环大陆物质。初步模拟表明，它们可能是由大洋中脊玄武岩来源的熔融产生的，该来源受到沉积物和洋壳蚀变的不同程度污染，可能是从邻近的俯冲带引入的。***