Origin of Mantle Heterogeneity in the Azores

本项目对亚速尔群岛高镁玄武岩进行了详细的地球化学和同位素研究，旨在阐明非均质幔源的成因。本研究利用187Os， 186Os和Hf同位素来解决几个重要的区域问题，包括：1)亚速尔群岛主要羽流的起源是什么？2)亚速尔群岛富地幔组分的来源及其分布位置；3)亚速尔群岛地幔柱是否起源于核幔边界，是否存在核幔相互作用的证据？了解亚速尔群岛地幔非均质性的起源，包括潜在再循环物质的性质、富集源在地幔中的位置以及地幔柱的起源深度，都对我们更深入地了解地壳再循环过程、混合和地幔非均质性的规模以及地球内部对流机制的性质具有重要意义。该项目将包括一名博士生，一名硕士学生和1-3名本科生，为期3年。研究生和本科生将获得最先进的地球化学实验室技术的广泛培训，并将通过参与与迈阿密大学Limper地质博物馆相关的K-12和社区外展项目分享他们的成果和经验。

This project is a detailed geochemical and isotopic study of high MgO basalts from the Azores archipelago, aimed at elucidating the origins of heterogeneous mantle sources. This study utilizes 187Os, 186Os and Hf isotopes to address several significant regional questions including: 1) What is the origin of the predominant Azores plume?; 2) What are the origins of the Azores enriched mantle components, and where do they reside?; and 3) Does the Azores plume rise from the core-mantle boundary, and is there evidence for core-mantle interaction? Understanding the origin of mantle heterogeneity in the Azores, including the nature of potential recycled materials, the location within the mantle of the enriched sources, and the depth of origin of the plume, all have important implications for our larger understanding of crustal recycling processes, scales of mixing and mantle heterogeneity, and the nature of convective regimes within the Earth's interior. This project will involve one Ph.D. student, one M.S. student, and 1-3 undergraduate students over the 3 year duration of the grant. The graduate and undergraduate students will gain extensive training in state-of-the-art geochemical lab techniques, and will share their results and experiences through participation in K-12 and community outreach programs associated with Miami University's Limper Geology Museum.