Collaborative Research: A Textural, Petrologic and Chemical Investigation of Multi-Stage Histories Recorded in Mantle Xenoliths from Volcanic Arcs

PIs打算研究宿主岩浆与捕虏体相互作用的方式，宏观和微观变形特征，模态丰度，矿物主要和微量元素化学，同位素（Sr, Nd, Pb， O， H和Be）分析，以及流体和熔体包裹体研究（拉曼）。所有工作都将在仔细关注结构、矿物学和岩石学证据的背景下进行，这些证据用于区分记录地幔历史不同阶段的捕虏体的那些部分。本研究的结节组来自几个地方。来自菲律宾吕宋弧巴丹岛和堪察加弧阿瓦钦斯基火山的捕虏体将成为详细同位素和微量元素工作的重点。在Kharchinsky、Shiveluch、Valovayam（堪察加弧线）和Chirinkotan（千岛群岛弧线）回收的捕虏体将进行初步的化学研究，为以后更详细的研究奠定坚实的基础，如果有必要的话。PIs希望解决有关交代作用前地幔的组成、弧火山特征的高场强元素异常的起源、交代剂的性质以及交代事件的年龄等问题。

9401930 Morris The PIs intend to study the way the host magmas interacted with the xenoliths, the macro and micro deformation features, modal abundances, mineral major and trace element chemistries, isotopic (Sr, Nd, Pb, O, H, and Be) analyses, and fluid and melt inclusion studies (Raman). All work will be carried out in the context of careful attention to textural, mineralogical, and petrological evidence used to distinguish those parts of the xenoliths that record different stages in mantle history. Suites of nodules for this study are from several localities. Xenoliths from Batan Island, Luzon arc, Philippines, and Avachinsky Volcano, Kamchatka arc will be the focus of detailed isotopic and trace element work. Xenoliths recovered from Kharchinsky, Shiveluch, Valovayam (Kamchatka arc), and Chirinkotan (Kuriles arc) will be subjected to preliminary chemical studies to form a solid base for more detailed work later, should such studies be warranted. The PIs hope to address questions concerning the composition of the mantle prior to metasomatism, the origin of high-field strength element anomalies characteristic of arc volcanics, the nature of the metasomatizing agent, and the age of the metasomatic event.