The Influence Of Mylonitic And Cataclastic Rocks
In Evaluation Of The Potential For Debris And
Hyper Concentrated Flows
Author(s)
L. Longoni & M. Papini
Abstract
In this study we want to evaluate the large amount of debris by analyzing a
typical alpine setting and focusing on the role of mylonitic and cataclastic zones
as a potential supply area for debris and hyper concentrated flows. The crystal
basement of the Southern Alps, and in particular of the Valtellina area, is
dominated by metamorphic rocks, faulted by important regional fault-systems.
These fault-systems and the related mylonitic and cataclastic rocks may produce
erosion-prone weak rock outcrops responsible for a large amount of debris
production and, consequently, localized erosion and sediment contribution to the
drainage network. We focus on Val Tartano, which is characterized by the
presence of extended mylonitic and cataclastic areas and we analyze these
geological structures as potential high-productivity sources contributing to the
increase of river solid transport. Characterization of streambed sediment from a
grain size and grain shape viewpoint is described, and their dependence upon the
eroded geological parent materials is discussed.
Keywords: debris flow, fault rocks, cataclasite, milonite, grain size, roundness.
1 Introduction
Riverbeds in mountain areas are frequently affected by hard to predict hydro
geological instabilities. Estimation of sediment volumes and grain sizes
contributed from valley slopes to the drainage system through erosion and mass
transport processes, as well as localized evolution of weaker zones, is of
particular interest. We believe that an improvement over current practice in the
Keywords
debris flow, fault rocks, cataclasite, milonite, grain size, roundness.
Related Book
Other papers in this volume
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