From mantle to crust and exosphere in volcanic arcs

从地幔到地壳和火山弧中的外逸层

• 批准号: 154275-2008
• 负责人: Canil, Dante
• 金额: $ 3.64万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=513793
• 关键词: mantle; crust; exosphere; volcanic; arcs

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.

该研究计划旨在理解在两个构造板碰撞（弧或收敛边缘）的环境中地幔衍生的岩浆和岩石圈的形成和演变。该研究的重点是在岩浆从地幔源区域流出的地幔，地壳和大气之间的流体和金属分配到弧火山的喷发，它们将它们脱离到大气中。研究工作旨在了解关键金属的分布和地球化学行为（Fe，Cu，re，as，sb，sb，in，sn，w），在弧形岩浆的上升，恢复和冷却，并受到系统的高压 - 温度实验：（a）地幔熔化随氧散热性（FO2）的函数，（b）原始弧衍生的岩浆中的流体/熔体/晶体分配。将一些实验数据与正在进行的侏罗纪弧形地壳中的中型地壳火成岩进行的现场研究进行了比较。