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

卡斯滕：这项工作包括对1993年从智利南脊轴线恢复的熔岩进行实验室和模型研究。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，大部分是富集的洋中脊玄武岩，其微量元素系统极不寻常，显示出与弧、弧后和再生大陆物质的地球化学亲和力。初步的模拟表明，它们可能是由洋中脊玄武岩源的融化产生的，该玄武岩源受到沉积物和变质的海洋地壳的不同污染，可能是在邻近的俯冲带引入的。＊＊＊

9503617 Karsten 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. ***