Assimilation of the Mantle and Altered Crust by Oceanic Magmas

火成岩、变质岩和沉积岩的同化作用， 玄武岩岩浆是火山活动不可避免的结果， 以及海洋中捕虏体（外来岩石碎片）的存在 岛屿和不断扩大的海洋裂缝证明了同化作用 确实发生在海洋火山活动期间 同化过程 是知之甚少，无论是融化，解体，或 扩散进入或离开被同化的物质是 主要过程将取决于材料的类型， 同化，对岩浆相互作用的动力学， 物质，以及岩浆的温度和成分。 这里支持的实验将调查第一个 这些问题;熔化，分解，或扩散， 各种地幔矿物和蚀变矿物， 与熔融玄武岩接触 实验的产物将 用电子探针和同位素进行化学分析 稀释质谱法 初步实验已经 产生了意想不到的有趣的结果， 将决定同化对专业的重要性， 微量元素化学 传播的裂谷玄武岩 该项目将在 120，470元2年

Assimilation of igneous, metamorphic, and sedimentary rocks by basalt magma is an unavoidable consequence of volcanic activity, and the presence of xenoliths (foreign rock fragments) in ocean island and propagating ocean rifts is evidence that assimilation does occur during oceanic volcanism. The process of assimilation is poorly understood and whether melting, disintegration, or diffusion into or out of the material being assimilated is the dominant process will depend on the type of material being assimilated, on the kinetics of magma interaction with that material, and on the temperature and composition of the magma. The experiments supported here will investigate the first of these problems; the melting, disintegration, or diffusion from various mantle minerals and alteration minerals, when placed in contact with molten basalt. The products of the experiments will be chemically analyzed by electron microprobe and isotope dilution mass spectrometry. Preliminary experiments have produced unexpected and interesting results, and further work will determine the importance of assimulation to the major and trace element chemistry of seamount, ocean island, and propagating rift basalts. This project will be supported at $120,470 for 2 years.