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Book Chapter

Indentation of volcanic edifices by the ascending magma

By
Olivier Merle
Olivier Merle
Département des Sciences de la TerreCNRS-OPGC-CRV, 5 rue Kessler, 63038 Clermont-Ferrand, Francemerle@opgc.univ-bpclermont.fr
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Franck Donnadieu
Franck Donnadieu
Département des Sciences de la TerreCNRS-OPGC-CRV, 5 rue Kessler, 63038 Clermont-Ferrand, Francemerle@opgc.univ-bpclermont.fr
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Published:
January 01, 1999

Abstract

The process by which magma ascends into and deforms a volcanic edifice is studied by analogue modelling. A control experiment is conducted with a wooden piston moving vertically into a sand cone. This reveals a well-defined fault pattern that makes it possible to draw the main compressive stress trajectory within the cone during the ascent of the piston. This makes it possible to show that the deformational process is that of indentation of the cone by the rigid piston. Experiments with an indenter that is viscous, as in nature, show that the motion of the viscous body is controlled by the first fault created in the cone. This fault serves as a structural guide, making the viscous body deviate from the vertical and resulting in deformation of the flank of the cone, which bulges out. Other major shear faults that were observed in the control experiment are then inhibited and do not form. This result emphasizes that the structural evolution of an indentation process within a brittle cone and at low rate depends on the rheology of the indenter.

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Contents

Geological Society, London, Special Publications

Salt, Shale and Igneous Diapirs in and around Europe

Bruno C. Vendeville
Bruno C. Vendeville
University of Texas, USA
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Yossi Mart
Yossi Mart
University of Haifa, Israel
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Jean-Louis Vigneresse
Jean-Louis Vigneresse
Université Nancy, France
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Geological Society of London
Volume
174
ISBN electronic:
9781862394223
Publication date:
January 01, 1999

GeoRef

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