From mantle to crust and exosphere in volcanic arcs

该研究项目旨在了解两个构造板块碰撞（弧形或会聚边缘）环境下地幔岩浆和岩石圈的形成和演化。研究的重点是岩浆从地幔源区出口到弧火山喷发时，在地幔、地壳和大气之间流体和金属的分割。本研究旨在了解弧源岩浆上升、侵位和冷却过程中关键金属（Fe、Cu、Re、As、Sb、In、Sn、W）的分布和地球化学行为，并通过系统的高压-温度实验(a)地幔熔融与氧逸度（fO2）的关系，以及(b)原始弧源岩浆的流体/熔体/晶体分配。将部分实验数据与正在进行的对不列颠哥伦比亚省温哥华岛斜剖面侏罗系弧形地壳中上部火成岩的野外研究进行了比较

This research program is directed at understanding the formation and evolution of mantle-derived magmas and lithosphere in settings where two tectonic plates collide (arcs or convergent margins). The research focuses on the partition of fluid and metals between mantle, crust and atmosphere during the egress of magmas from their mantle source regions to eruptions in arc volcanoes where they degas into the atmosphere. The research effort seeks to understand the distribution and geochemical behaviour of key metals (Fe, Cu, Re, As, Sb, In, Sn, W) during the ascent, emplacement and cooling of arc magma, and is underpinned by systematic high pressure-temperature experimentation on: (a) mantle melting as a function of oxygen fugacity (fO2), and (b) fluid/melt/crystal partitioning in primitive arc-derived magmas. Some of the experimental data are compared with an ongoing field study of mid-upper crustal igneous rocks in Jurassic-aged arc crust exposed in oblique section on Vancouver Island, B.C.