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Volcano-tectonics under intra-arc transpression

弧内转压下的火山构造

基本信息

批准号：
355640964
负责人：
Professor Dr. Ulrich Peter Riller
金额：
--
依托单位：
Consejo Nacional de Investigaciones Científicas y Técnicas
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/355640964?language=en
关键词：
Volcano tectonics under intra arc

项目摘要

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.

大多数岩浆弧形成于以斜向板块会聚为特征的板块边缘。了解火山活动与地壳变形之间的成因联系，对于此类岩浆弧人口密集地区的风险评估至关重要。在这方面，我们的研究的主要目标是更好地了解，在多个尺度上，弧内平移的影响，包括继承的地壳不连续性的影响，对火山口和成层火山的形成。我们将重点评估南纬37°和40°之间安第斯山脉南部火山带两个上板块地壳段之间过渡处的火山-构造关系。具体来说，我们将探讨在多大程度上变形在一个大的弧内transpressure区，液化Ofqui断层带（LOFZ）的尖端，影响形成的阿格里奥火山口和活跃的Copahue火山，这是经常光顾的成千上万的游客在冬季的时间。该区域的火山构造特征将与Lanin火山附近LOFZ的一段进行比较，其特征是走滑变形。该项目采用的方法包括遥感、按比例模拟实验、地貌构造分析、结构实地工作和地球化学分析，并将与阿根廷科尔多瓦的CICTERRA合作进行。