Volcano-tectonics under intra-arc transpression

大多数岩浆弧形成于板块边缘，以倾斜的板块会聚为特征。了解火山活动和地壳变形之间的遗传联系，对于评估此类岩浆弧的人口聚居区的风险至关重要。在这方面，我们研究的主要目标是在多个尺度上更好地了解弧内挤压的影响，包括继承的地壳不连续对火山口和层状火山形成的影响。我们将重点评估安第斯山脉南部火山带两个上板块地壳段在37°S和40°S之间过渡时的火山-构造关系。具体地说，我们将探索大型弧内转压带Liquine-Ofqui断裂带顶端的变形在多大程度上影响Agrio Caldera和Copahue活火山的形成，这两个火山在冬季有成千上万的游客经常光顾。该地区的火山构造特征将与拉宁火山附近LOFZ的走滑变形特征进行比较。该项目采用的方法包括遥感、比例尺模拟实验、地形构造分析、构造实地工作和地球化学分析，并将与设在阿根廷科尔多瓦的CICTERRA合作开展。

Most magmatic arcs form at plate margins that are characterized by oblique plate convergence. An understanding of the genetic link between volcanism and crustal deformation is paramount for risk assessments in populated areas of such magmatic arcs. In this regard, the prime objective of our study is to better understand, on multiple scales, the effects of intra-arc transpression, including the influence of inherited crustal discontinuities, on the formation of calderas and stratovolcanoes. We will focus our assessment on the volcano-tectonic relationship at the transition between the two upper-plate crustal segments of the Southern Volcanic Zone in the Andes between 37°S and 40°S. Specifically, we will explore to what extent deformation at the tip of a large intra-arc transpression zone, the Liquine-Ofqui Fault Zone (LOFZ), influences the formation of the Agrio Caldera and the active Copahue volcano, which are frequented by thousands of visitors in winter time. The volcano-tectonic characteristics of this area will be compared to those at a segment of the LOFZ near Lanin volcano, characterized by strike-slip deformation. The methods conducted in this project include remote sensing, scaled analogue experiments, morphotectonic analysis, structural field work and geochemical analyses and will be conducted in collaboration with CICTERRA in Cordoba, Argentina.