Collaborative Research: Using the Products of Volcano-Ice Interaction to Constrain Paleo-Ice Conditions

本文对加拿大不列颠哥伦比亚省北部的Edziza火山复合体（EVC）进行了火山学、沉积学、地球化学和地质年代学的综合研究，以限制该地区更新世冰条件的变化，并开发了使用这种多学科研究作为世界其他地方古冰条件/古气候的代用方法。该项目将开发一种基于综合冰火相和冰成相分析、火山玻璃挥发性和h同位素分析以及精确的40Ar/39Ar地质年代学数据集的方法，这些数据集可用于约束不列颠哥伦比亚省以及许多其他冰川火山地区（如喀斯喀特山脉、安第斯山脉、冰岛、南极洲西部和西伯利亚）的更新世冰情。不列颠哥伦比亚省中北部是了解科迪勒兰冰原（CIS）动力学的关键地区，因为模型表明，在末次盛冰期，该地区靠近科迪勒兰冰原的中心和最厚的部分，并且也位于一个主要的冰分水岭上。基性冰火山作用的过程和产物已有文献记载，而中硅质冰火山作用的过程和产物则鲜为人知。这个项目将大大增加我们对这种火山-冰相互作用的理解。对地球上火山-冰相互作用的研究也有助于我们了解火星上岩浆-冰相互作用产生的沉积物和大厦，这被认为是重要的天体生物学目标。

This is an integrated volcanological, sedimentological, geochemical and geochronological study of mafic and intermediate-silicic glaciovolcanic and glacial deposits from the Edziza Volcanic Complex (EVC), in northern British Columbia, Canada to both constrain variations in Pleistocene ice conditions in this region and to develop the methodology of using such a multi-disciplinary study as a proxy for paleo-ice conditions/paleoclimate elsewhere in the world. This project will develop a methodology based on integrating datasets from glaciovolcanic and glaciogenic facies analysis, volatile and H-isotope analysis of volcanic glass, and precise 40Ar/39Ar geochronology that could be used to constrain Pleistocene ice conditions in British Columbia, and in many other glaciated volcanic areas, such as the Cascades, the Andes, Iceland, west Antarctica and Siberia. North-central British Columbia is a key area for understanding the dynamics of the Cordilleran Ice Sheet (CIS), as models suggest that this area lay close to the central and thickest part of the CIS during the Last Glacial Maximum and was also located along a major ice divide. The processes and products of mafic glaciovolcanism are well documented, but those of intermediate-silicic glaciovolcanism are much less well known. This project will significantly increase our understanding of this style of volcano-ice interaction. Studies of volcano-ice interaction on Earth also help our understanding of deposits and edifices generated by magma-ice interaction on Mars, which are recognized as significant astrobiological targets.