From mantle to crust and exosphere in volcanic arcs

这项研究计划旨在了解在两个构造板块碰撞(弧形或会聚边缘)的背景下，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流出到弧形火山喷发并释放到大气中的过程中，流体和金属在地幔、地壳和大气之间的分配。这项研究旨在了解关键金属(Fe、Cu、Re、As、Sb、In、Sn、W)在弧岩浆上升、侵位和冷却过程中的分布和地球化学行为，并建立在以下系统的高温高压实验的基础上：(A)地幔熔融作为氧逸度(FO2)的函数，以及(B)原始弧源岩浆中的流体/熔体/晶体分配。其中一些实验数据与在不列颠哥伦比亚省温哥华岛斜剖面暴露的侏罗纪年代弧形地壳中上地壳火成岩的现场研究进行了比较。

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.