Publication Date:
2020-06-17
Description:
Peripheral diffuse degassing of CO2 from the soil occurs across the western flank of Piton de la Fournaise volcano
(La Réunion Island, Indian Ocean) along a narrow zone. In this area, carbon isotopic analysis on soil gas samples
highlights significant mixing between magmatic and organic end-members. The zones with the strongest magmatic signature (highest δ13C) overlap spatial distribution of hypocenters recorded shortly before and during volcano reactivation and allow discriminating a N135° degassing lineament, with a minimum length of 11 km and
140 ± 20 m-width. Such orientation is in accordance with that of an old dyke network along the rift zone and
with N120–130° and N140–155° lineaments related to the inheritance of oceanic lithosphere structures.
Our findings show that this N135° lineament represents a preferential magmatic pathway for deep magma transfer
below the volcano flank. Moreover, spatial distributions of recent eccentric cones indicate a well-founded possibility that future eruptions may by-pass the shallow plumbing system of the central area of the volcano, taking a lateral pathway along this structure. Our results also confirm that Piton de la Fournaise activity is linked to a laterally
shifted plumbing system and represent a major improvement in identifying the main high-risk area on the densely
populated western flank of the volcano
Description:
Published
Description:
193-207
Description:
2V. Struttura e sistema di alimentazione dei vulcani
Description:
4V. Dinamica dei processi pre-eruttivi
Description:
5V. Dinamica dei processi eruttivi e post-eruttivi
Description:
6V. Pericolosità vulcanica e contributi alla stima del rischio
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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