Melt Transport from Mantle Plumes: Integrated Studies of Xenoliths and Associated Basalts from Oceanic Islands

9315698 Hauri这一新提议将对萨瓦伊岛上的碱性玄武岩中的超镁铁质包体套进行详细的结构、热压测量、离子探针以及Sr-Nd-Pb和Os同位素分析。（西萨摩亚），Tubuai（南方群岛）、塔希提岛和塔哈岛（社会群岛）、希瓦奥阿岛、乌阿胡卡岛和努卡希瓦岛（马克萨斯群岛）、奥巴桑乔岛（夏威夷群岛）和艾图塔基岛（库克群岛）。 这些捕虏体套房火山活动在这些岛屿的关系将进行检查的Sr，Nd，Pb和Os同位素研究的地层控制玄武岩部分从Tubuai，Occupy（Koolau和檀香山火山）莫纳罗亚和Tahaa。 我们建议广泛使用Os同位素作为示踪剂的橄榄岩和幔源岩浆中的兼容元素，以区分熔融相互作用与岩石圈与地幔柱衍生的地幔源。 研究将侧重于具体问题，如：1）地幔柱与岩石圈来源的OIB包体，2）大洋岩石圈来源的贡献，在大洋岛屿玄武岩的同位素变化，3）不同的风格和产品下的岩浆地幔个别岛屿，作为岩石圈年龄，厚度和温度的函数，（4）地幔结构和粒度的变化在多大程度上控制了岩浆迁移的物理化学特征。

9315698 Hauri This new proposal will apply detailed textural, thermobarometry, ion microprobe, and Sr-Nd-Pb and Os isotopic analyses to suites of ultramafic xenoliths hosted by alkali basalts on the oceanic islands of Savai'i (Western Samoa), Tubuai (Austral Islands), Tahiti and Tahaa (Society Islands), Hiva Oa, Ua Huka and Nuka Hiva (Marquesas Islands), Oahu (Hawaiian Islands) and Aitutaki (Cook Islands). The relationship of these xenolith suites to volcanism at these islands will be examined by undertaking Sr, Nd, Pb and Os isotopic studies of stratigraphically controlled basalt sections from Tubuai, Oahu (Koolau and Honolulu Volcanics) Mauna Loa, and Tahaa. We propose extensive use of Os isotopes as tracers of compatible elements in peridotites and mantle-derived magmas in order to distinguish melt interaction with lithospheric versus plume derived mantle sources. Research will focus on specific issues such as: 1) mantle plume versus lithospheric origin for OIB-hosted xenoliths, 2) contribution of the oceanic lithosphere sources to isotopic variations in oceanic island basalts, 3) contrasting styles and products of magma-mantle beneath individual islands, as a function of lithospheric age, thickness, and temperature, and 4) the extent to which the physical and chemical characteristics of magma migration are controlled by variations in texture and grain size of the mantle.