Rock Coring Koolau Volcano, Hawaii: Implications for Deep Mantle Recycling of the Crust

来自地幔柱的玄武岩提供了关于地球地幔组成和历史的基本信息。 夏威夷地幔柱是地幔柱的典型例子，它的玄武岩无疑是所有地幔柱中研究得最好的一套。 夏威夷库劳火山的熔岩属于洋岛玄武岩的独特成分端元，似乎为地壳（沉积物和玄武岩）的深地幔再循环提供了强有力的证据，尽管这种解释仍然存在争议，并且仅基于对火山最上层单板的取样。 该提案要求提供资金，以便从一个约245米深的水观测孔底部获取约300米的岩芯。 这口井的岩石将延伸到火山的任何表面暴露之下，预计所获得的岩石将经历比表面岩石更少的热带风化。 我们将系统地描述我们为夏威夷科学钻探计划开发的钻井后续程序中的碎片和岩心，并对这个为期一年的项目的岩心和碎片进行初步的岩相学和地球化学表征。

Basalts from mantle plumes provide fundamental information on the composition and history of the Earth's mantle. The Hawaiian plume is the classic example of a mantle plume and its basalts are unquestionably the best studied suite from any plume. The lavas of Koolau Volcano in Hawaii belong to a distinct compositional endmember of ocean island basalts and appear to provide the strong evidence for deep mantle recycling of crust (sediment and basalt), although this interpretation remain controversial and is based on sampling only the uppermost veneer of the volcano. This proposal requests funding to obtain ~300 m of rock core from the base of a ~245 m deep, water observation hole. The rocks from this well will extend below any surface exposures of the volcano and it is expected that the rocks obtained will have experienced less tropical weathering than surface rocks. We will systematically describe the chips and cores from the well following procedures we have developed for the Hawaii Scientific Drilling Program and make an initial petrographic and geochemical characterization of the core and chips for this one year project.