Collaborative Research: Evolution of the Kerguelen Plume: A Geochemical Approach

在众多地幔柱中，凯尔盖朗地幔柱最为突出， 一个巨大的，长期存在的烟羽， 凯尔盖朗高原，两大海洋高原之一， 世界 私家侦探们提议调查地球化学 羽流演化历史的各个方面。 我们 工作将集中在两个独立的项目：（1） 玄武岩项目（Frey）将重点关注古老的高原玄武岩 西北部省份的熔岩 地球化学 这些最古老的玄武岩的特征将呈现出清晰的 对观测到的长期同位素变化的理解 年轻的皮疹。 比较研究 凯尔盖朗和夏威夷的羽流将为我们提供重要的 地幔柱的不同部分是如何 以及地幔柱的地球化学演化。 （二） Xenolith项目（清水）将专注于详细的 岩石学、矿物化学（主要和微量元素） 下地壳和地幔的同位素组成 捕虏体 私家侦探们想知道 麻粒岩是否是古代大陆地壳的碎片 或在麻粒岩中重结晶的年轻玄武质地壳 相条件 上地幔捕虏体也将用于 为了调查接骨板的设置， 古大陆岩石圈， 地幔柱熔体和岩石圈/软流圈。

Among many mantle plumes, the Kerguelen plume stands out as a large, long-lived plume manifesting itself as the Kerguelen Plateau, one of the two giant oceanic plateaus of the world. The P.I.s propose to investigate geochemical aspects of the evolutionary history of the plume. Our effort will be focused into two separate projects: (1) Basalt project (Frey) will focus on the old plateau basalt lavas in the northwestern province. Geochemical characterization of these oldest basalts will present clear understanding of secular isotopic variations observed on younger eruptives. Comparative studies between the Kerguelen and Hawaiian plumes will provide important information on how different parts of mantle plumes are tapped and on how mantle plumes evolve geochemically. (2) Xenolith project (Shimizu) will focus on detailed petrography, mineral chemistry (major and trace elements) and isotopic compositions of lower crustal and mantle xenoliths. The P.I.s intend to obtain definitive answers on whether granulites are pieces of ancient continental crust or young basaltic crust recrystallized in the granulite facies conditions. Upper mantle xenoliths will also be used to investigate the plate setting, a possible involvement of ancient continental lithosphere, and interaction between plume-derived melts and lithosphere/asthenosphere.