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| Titel |
Large-scale sliding induced by sill intrusions at Réunion Island: insights from numerical modeling. |
| VerfasserIn |
Marie Chaput, Virginie Pinel, Vincent Famin, Laurent Michon |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090124
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| Publikation (Nr.) |
 EGU/EGU2014-4340.pdf |
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| Zusammenfassung |
| 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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