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

这是一项对加拿大不列颠哥伦比亚省北部Edziza火山杂岩(EVC)的镁铁质和中硅冰火山和冰川沉积进行的火山学、沉积学、地球化学和地质年代学综合研究，目的是限制该地区更新世冰川条件的变化，并发展利用这种多学科研究作为世界其他地区古冰川条件/古气候代理的方法。该项目将开发一种方法，其基础是综合来自冰火山和冰川成因相分析、火山玻璃的挥发性和氢同位素分析以及精确的40Ar/39Ar年代学的数据集，该年代学可用于约束不列颠哥伦比亚省以及许多其他冰川火山区，如喀斯喀德、安第斯山脉、冰岛、南极洲西部和西伯利亚的更新世冰条件。不列颠哥伦比亚省中北部是了解科迪勒兰冰盖(CIS)动态的关键地区，因为模型表明，在最后一次冰盛期，该地区靠近独联体的中心和最厚的部分，也位于一个主要的冰川分水岭上。镁铁质冰火山作用的过程和产物被很好地记录下来，但那些中等硅质冰火山作用的过程和产物却鲜为人知。这个项目将大大增加我们对这种类型的火山-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理解火星上岩浆-冰相互作用产生的沉积物和建筑物，它们被认为是重要的天体生物目标。

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.