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A gravitational origin for volcano-tectonic faults in the Campi Flegrei caldera (southern Italy) inferred from detailed field observations
Journal of Structural Geology ( IF 3.1 ) Pub Date : 2022-06-26 , DOI: 10.1016/j.jsg.2022.104671
Renato Diamanti , Giovanni Camanni , Jacopo Natale , Stefano Vitale

Faults in volcanic areas can have different origins and can form due to several volcano-tectonic processes. In this work, by means of detailed field observations, we analysed a fault array cutting through a recent pyroclastic succession in the Campi Flegrei caldera of southern Italy to investigate its origin. Geometric and kinematic data indicate that the fault array consists of steeply dipping faults with both normal and reverse senses of movement. Displacement data suggest that these faults with opposed kinematics acted together , in agreement with what was previously described from analogue and numerical experiments for faults formed in response to gravitational collapses in volcanic areas. By integrating these results with considerations of the recent volcano-tectonic evolution of the Campi Flegrei caldera, we propose a model in which the studied fault array developed to accommodate a gravitational collapse triggered by an underground magma migration predating the 1538 CE historical Monte Nuovo eruption. This work is, to our knowledge, the first thorough field description of faults developed to accommodate gravitational collapses in volcanic areas.



中文翻译:

从详细的实地观测中推断出 Campi Flegrei 火山口(意大利南部)火山构造断层的引力起源

火山区的断层可以有不同的起源,并且可以由于几个火山构造过程而形成。在这项工作中,通过详细的实地观察,我们分析了一个断层阵列,该断层阵列穿过意大利南部 Campi Flegrei 火山口最近的火山碎屑序列,以调查其起源。几何和运动学数据表明,断层阵列由具有正向和反向运动方向的陡倾断层组成。位移数据表明,这些具有相反运动学的断层共同作用,这与先前从模拟和数值实验中描述的火山区域重力坍塌形成的断层一致。通过将这些结果与 Campi Flegrei 火山口近期火山构造演化的考虑相结合,我们提出了一个模型,在该模型中,所研究的断层阵列是为了适应由公元 1538 年历史上的 Monte Nuovo 喷发之前的地下岩浆迁移引发的重力坍塌。据我们所知,这项工作是第一次对为适应火山地区的重力崩塌而开发的断层进行全面的现场描述。

更新日期:2022-06-26
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