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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The buried caldera of Misti volcano, Peru, revealed by combining a self-potential survey with elliptic Fourier function analysis of topography
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The buried caldera of Misti volcano, Peru, revealed by combining a self-potential survey with elliptic Fourier function analysis of topography

机译：秘鲁米斯蒂火山的地下火山口通过自势调查与椭圆形傅里叶功能分析相结合而揭示

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摘要

This survey proposes a new approach to identify buried caldera boundaries of a volcanic cone, combining (1) a systematic elliptic Fourier functions (EFF) analysis on the contour lines based on the external shape of the edifice with (2) self-potential (SP) measurements on volcano flanks. The methodology of this approach is to investigate the relationships between (1) vertical morphological changes inferred from EFF analysis and (2) lateral lithological transition inside the edifice inferred from SP/ elevation gradients. The application of these methods on Misti volcano in southern Peru displays a very good correlation. The three main boundaries evidenced by hierarchical cluster analysis on the contour lines coincide with the two main boundaries characterised by SP signal and with a secondary SP signature related with a summit caldera. In order to explain these results showing a very good correlation between morphologic and lithologic changes as function of elevation, caldera boundaries have been suggested. The latter would be located at an average elevation of (1) 4350-4000 m, (2) 4950-5000 m, and (3) 5500-5550 m. For the lowest boundary in elevation, the coincidence with the lateral extension of the hydrothermal system inferred from SP measurements suggests that caldera walls act as a barrier for lateral extension of hydrothermal systems. In the summit area, the highest boundary has been related with the summit caldera, inferred by a secondary SP minimum and geological evidence.
机译：这项调查提出了一种识别火山锥的埋入破火山口边界的新方法，该方法将（1）基于建筑物外部形状的轮廓线的系统椭圆傅立叶函数（EFF）分析与（2）自电势（SP）相结合）在火山侧面进行测量。这种方法的方法是研究（1）从EFF分析推断出的垂直形态变化与（2）从SP /高程梯度推断出的建筑物内部的横向岩性过渡之间的关系。这些方法在秘鲁南部米斯蒂火山上的应用显示出很好的相关性。通过等高线上的层次聚类分析所证明的三个主要边界与以SP信号为特征的两个主要边界以及与山顶破火山口相关的次要SP特征一致。为了解释这些结果，表明形态和岩性变化之间随高度的变化具有很好的相关性，提出了破火山口边界。后者的平均高度为（1）4350-4000 m，（2）4950-5000 m和（3）5500-5550 m。对于高程的最低边界，从SP测量推断出的热液系统横向扩展的巧合表明火山口壁成为热液系统横向扩展的障碍。在山顶地区，最高边界与山顶破火山口有关，由次生SP最小值和地质证据推断出。

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