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.

该研究计划旨在了解两个构造板块碰撞（弧形或会聚边缘）环境中地幔岩浆和岩石圈的形成和演化。该研究的重点是岩浆从地幔源区流出到弧火山喷发期间，在岩浆脱气到大气中时，地幔、地壳和大气之间的流体和金属的分配。该研究工作旨在了解弧岩浆上升、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，并以系统高压-温度实验为基础：(a) 地幔熔化作为氧逸度 (fO2) 的函数，以及 (b) 原始流体/熔体/晶体分配 弧源岩浆。一些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暴露的侏罗纪时代弧地壳中上地壳火成岩的现场研究进行了比较。