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首页> 外文期刊>Geomorphology >Impact of weathering on the geomechanical properties of rocks along thermal-metamorphic contact belts and morpho-evolutionary processes: The deep-seated gravitational slope deformations of Mt. Granieri-Salincriti (Calabria- Italy)
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Impact of weathering on the geomechanical properties of rocks along thermal-metamorphic contact belts and morpho-evolutionary processes: The deep-seated gravitational slope deformations of Mt. Granieri-Salincriti (Calabria- Italy)

机译：风化对沿热变质接触带的岩石的地质力学特性和形态演化过程的影响：山的深部重力斜坡变形。 Granieri-Salincriti（意大利卡拉布里亚）

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Numerous Deep-Seated Gravitational Slope Deformations (DSGSDs) occur throughout Italy, that originate from particular tectono-stratigraphic settings, relief, seismicity, deglaciation, as well as from intense and deep processes of chemico-physical weathering of crystalline-metamorphic rocks. These DSGSDs are particularly widespread in the Calabrian mountains. This study is focused on the Mt. Granieri-Salincriti slope, on the Ionian side of the Serre Massif, where granites and granodiorites (Stilo Unit, Palaeozoic) are in contact with metamorphites through a thermal-metamorphic aureole. This setting generates deep geochemical processes, inducing intense chemical weathering. These processes are mainly due to the interaction between groundwater and the sulphides that are contained in the local pegmafitic-hydrothermal intrusions, especially along the thermal-metamorphic contact belt. The Mt. Granieri-Salincriti slope has an important DSGSD, which is associated with many active and/or quiescent landslides. Among these landslides, the Salincriti rock avalanche-debris flow (about 2 M m~3) represents the paroxysmal and terminal stage of the deep creep deformations of Mt. Granieri, typifying a geological setting that is common in the Calabrian Arc. This multi-disciplinary study assessed the weathering susceptibility of the local crystalline-metamorphic rocks, especially those lying along thermal-metamorphic contact belts, by characterising the weathering horizons and the spatial distribution of weathering in the rock mass. The study was also aimed at identifying the relations between weathering, above all deep geochemical processes, effects on rocks and slope morphodynamics. The methodology was based on detailed geological data, geological-engineering surveys, geomorphology and surface hydrogeology analyses, as well as physico-mechanical laboratory tests. These investigations, supported by a monitoring program, led to the development of an engineering-geological model of the slope. Geological character (attributed to a thermal-metamorphic contact belt), geomorphological evidence and geomechanical elements elucidated the interactions between deep geochemical processes and weak belts in the investigated rocks, as well as the critical role that these interactions play in the evolution of deep-seated creep deformations and associated shallow landslides.
机译：在意大利各地发生了许多深层重力引力变形，这是由于特定的构造地层环境，地貌，地震活动，冰消作用以及结晶变质岩化学物理风化的强烈和深层过程引起的。这些DSGSD在卡拉布里亚山区尤为普遍。这项研究的重点是山。 Serre地块爱奥尼亚一侧的Granieri-Salincriti斜坡上，花岗岩和花岗闪长岩（Stilo单元，古生代）通过热变质的金针与变质岩接触。此设置会产生深层的地球化学过程，从而引起强烈的化学风化。这些过程主要是由于地下水与局部岩钉-热液侵入体中所含的硫化物之间的相互作用所致，特别是沿热变质接触带。山。 Granieri-Salincriti斜坡具有重要的DSGSD，与许多活跃和/或静止的滑坡有关。在这些滑坡中，Sarincriti岩石雪崩-泥石流（约2 M m〜3）代表了Mt深部蠕变变形的阵发性和末期。 Granieri，代表了卡拉布里亚弧线中常见的地质环境。这项多学科研究通过表征岩层的风化层位和风化的空间分布，评估了局部结晶-变质岩，特别是沿热-变质接触带的岩石的风化敏感性。该研究还旨在确定风化，尤其是深部地球化学过程，对岩石的影响和斜坡形态动力学之间的关系。该方法基于详细的地质数据，地质工程勘察，地貌和地表水文地质分析以及物理力学实验室测试。这些调查得到监测程序的支持，导致开发了斜坡的工程地质模型。地质特征（归因于热变质接触带），地貌学证据和地质力学元素阐明了被调查岩石中深部地球化学过程与弱带之间的相互作用，以及这些相互作用在深部演化中的关键作用。蠕变变形和相关的浅层滑坡。

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