Three‐dimensional resistivity image of the magmatic system beneath Lastarria volcano and evidence for magmatic intrusion in the back arc (northern Chile)
Three‐dimensional resistivity image of the magmatic system beneath Lastarria volcano and evidence for magmatic intrusion in the back arc (northern Chile)
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DOI：
10.1002/2015gl064426
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发表时间：
2015-07
影响因子：
5.2
通讯作者：
D. Díaz;W. Heise;F. Zamudio
中科院分区：
文献类型：
--
作者：
D. Díaz;W. Heise;F. Zamudio
位于安第斯山脉中部的拉祖弗雷火山中心最近经历了一次隆升，形成了世界上最广泛的变形火山系统之一，但其岩浆系统及其与所观察到的隆升的关系仍缺乏研究。在这里，我们使用大地电磁法对拉斯塔里亚火山周围的电阻率结构进行成像，拉斯塔里亚火山是拉祖弗雷地区最重要的特征之一，以了解岩浆管道的性质，相关的火山活动和大规模的地表变形。三维建模的结果显示，在Lastarria火山以南6公里深处有一个传导带，被解释为岩浆热源，与火山下方较浅的导体相连，显示了火山气体和加热流体的路径。与地壳中部岩浆侵入的隆起点区域重合的大规模导电区域。
Lazufre volcanic center, located in the central Andes, is recently undergoing an episode of uplift, conforming one of the most extensive deforming volcanic systems worldwide, but its magmatic system and its connection with the observed uplift are still poorly studied. Here we image the electrical resistivity structure using the magnetotelluric method in the surroundings of the Lastarria volcano, one of the most important features in the Lazufre area, to understand the nature of the magmatic plumbing, the associated fumarolic activity, and the large‐scale surface deformation. Results from 3‐D modeling show a conductive zone at 6 km depth south of the Lastarria volcano interpreted as the magmatic heat source which is connected to a shallower conductor beneath the volcano, showing the pathways of volcanic gasses and heated fluid. A large‐scale conductive area coinciding with the area of uplift points at a magma intrusion at midcrustal depth.