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Large-scale sliding induced by sill intrusions at Réunion Island: insights from numerical modeling

Abstract : Recent structural analysis of outcrops at Piton des Neiges, the eroded shield volcano of La Réunion Island, show that co-and/or post-intrusive sliding occurs at sills, located at deep level, along a detachment. We performed a 2D numerical study to quantify the perturbation induced by sill injection within a volcanic edifice. Magma is considered as an inviscid and pressurized fluid injected in an initially stable edifice under gravity-controlled extension. Displacements along the detachment are controlled by a friction law. We show that sill injection always induces tangential displacements. This effect is strongly increased when sills are emplaced along a detachment rather than in an homegeneous edifice. In this case, the magma injection produces extension behind the intrusion and potentially ends up in a large-scale flank collapse. Sill injections can thus explain the co-intrusive shear deformation observed at Piton des Neiges and the tangential displacements measured at Piton de la Fournaise during the 2007 eruption.
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https://hal.univ-reunion.fr/hal-01387001
Contributor : Laurent Michon <>
Submitted on : Friday, October 28, 2016 - 10:58:21 AM
Last modification on : Friday, July 17, 2020 - 5:09:04 PM

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  • HAL Id : hal-01387001, version 1

Citation

Marie Chaput, Virginie Pinel, Vincent Famin, Laurent Michon. Large-scale sliding induced by sill intrusions at Réunion Island: insights from numerical modeling. EGU 2014, Apr 2014, Vienna, Austria. pp.EGU2014-4340. ⟨hal-01387001⟩

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