Collaborative Research:Insights into plume-lithosphere interaction from Hawaiian mantle xenoliths

这项研究将涉及岩石学工作，矿物化学分析（主要和微量元素），Hf，Os，Sr，Pb和Nd同位素研究的矿物分离尖晶石橄榄岩和石榴石“辉石岩套”捕虏体从后侵蚀檀香山火山岩（HV）的奥陶洛斯。捕虏体来自三个喷口：盐湖火山口（SLC）位于库劳火山的边缘;考和帕利火山口靠近其破火山口。该奖项的首要目标是利用同位素和矿物化学信息推断捕虏体的起源。捕虏体上的同位素信息和矿物温压测量将使PI能够识别可能由夏威夷羽流与岩石圈起源的物质（俯冲地壳和地幔，甚至下地幔或过渡带物质）的类型。这项研究将提供一个直接的洞察到的同位素变化的浅地幔下的地幔，无论他们的起源在羽，岩石圈，或作为一个混合产品的羽，岩石圈或软流圈衍生的组件。一旦这些被确定，现有的夏威夷火山作用和岩石圈过程的模型可能会微调或更好的模型可能会被提出。

This study will involve petrographic work, mineral chemical analysis (major and trace elements), and Hf, Os, Sr, Pb, and Nd isotope study of mineral separates from spinel peridotite and garnet "pyroxenite suite" xenoliths from the post-erosional Honolulu Volcanics (HV) of Oahu. The xenoliths come from three vents: Salt Lake crater (SLC) is located on the rim of the Koolau volcano; and Kaau and Pali vents are located close to its caldera. The first order goal under this award is to infer xenolith origins using the combined isotopic and mineral chemical information. The isotopic information and mineral thermobarometry on the xenoliths will allow the PIs to recognize the types of materials (subducted crust and mantle or even lower mantle or transition zone materials) that may have been brought up by the Hawaiian plume versus those that have a lithospheric origin. The study will offer a direct insight into the isotopic variability of the shallow mantle beneath Oahu irrespective of their origin in the plume, the lithosphere, or as a mixed product of plume, lithosphere or asthenosphere- derived components. Once these are identified, existing models on Hawaiian volcanism and lithospheric processes may be fine-tuned or better models may be proposed.