Eruptive Activity on the Western Flank of Piton de la Fournaise (La Réunion Island, Indian Ocean): Insights on Magma Transfer, Storage and Evolution at an Oceanic Volcanic Island
Abstract
Abstract Petrological and geochemical (major element, trace element, Sr–Nd isotope) data for recent (<5 kyr old) basalts that sporadically erupt on the western flank of Piton de la Fournaise (PdF), one of the most active volcanoes on Earth, allow the tracking of magma transfer and evolution from mantle to crustal depths. In the western peripheral area of PdF we document the broadly synchronous eruptions of (1) primitive olivine and olivine–clinopyroxene transitional basalts with tholeiitic affinity that are closely associated in space with (2) transitional olivine basalts with alkaline affinity, and (3) hybrid lavas, intermediate between the ‘alkaline’ and the ‘tholeiitic’ end-members. The composition of the latter overlaps with that of the lavas frequently erupted from the conduit system feeding the main summit cone. AlphaMELTS modelling, and fluid inclusion and clinopyroxene barometry, constrain the conditions of magma storage at 10–30 km, and the ascent of magma from the upper mantle to the shallow crustal plumbing system. Variable degrees of mantle melting, together with minor source heterogeneity and contamination with cumulate-derived partial melts, contribute to the diversity of PdF magmas. However, all these processes do not represent the dominant factors that produce the large variability we found in major element composition. Indeed, the compositionmore »
- Authors:
-
- Laboratoire Géosciences Réunion, Université de La Réunion, Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Saint-Denis F-97715, France, Observatoire Volcanologique du Piton de la Fournaise (OVPF), Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Université Paris Diderot, Bourg Murat, France
- Institut des Sciences de la Terre d’Orléans (ISTO): UMR 7327, Université d’Orléans, 45071 Orléans, France, ISTO, UMR 7327, CNRS, 45071 Orléans, France, ISTO, UMR 7327, BRGM, BP 36009 Orléans, France
- Observatoire Volcanologique du Piton de la Fournaise (OVPF), Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Université Paris Diderot, Bourg Murat, France, Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Université Paris Diderot, Paris F-75005, France
- GZG, Abt. Geochemie, Universität Göttingen, Goldschmidtstr. 1, Göttingen 37077, Germany
- Istituto Nazionale di Geofisica e Vulcanologia (INGV), Osservatorio Vesuviano, Via Diocleziano 328, Napoli 80124, Italy
- Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Université Paris Diderot, Paris F-75005, France
- Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Université Paris Diderot, Paris F-75005, France, Instituto de Investigação em Vulcanologia e Avaliação de Riscos, Universidade dos Açores, Rua Mãe de Deus, Ponta Delgada 9500-321, Portugal
- Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicher Str. 49b, Köln 50674, Germany
- Laboratoire Géosciences Réunion, Université de La Réunion, Institut de Physique du Globe de Paris (IPGP), Sorbonne Paris-Cité, UMR 7154 CNRS, Saint-Denis F-97715, France
- Publication Date:
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain
- OSTI Identifier:
- 1771844
- Resource Type:
- Published Article
- Journal Name:
- Journal of Petrology
- Additional Journal Information:
- Journal Name: Journal of Petrology Journal Volume: 60 Journal Issue: 9; Journal ID: ISSN 0022-3530
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Boudoire, G., Brugier, Y. -A, Di Muro, A., Wörner, G., Arienzo, I., Metrich, N., Zanon, V., Braukmüller, N., Kronz, A., Le Moigne, Y., and Michon, L. Eruptive Activity on the Western Flank of Piton de la Fournaise (La Réunion Island, Indian Ocean): Insights on Magma Transfer, Storage and Evolution at an Oceanic Volcanic Island. United Kingdom: N. p., 2019.
Web. doi:10.1093/petrology/egz045.
Boudoire, G., Brugier, Y. -A, Di Muro, A., Wörner, G., Arienzo, I., Metrich, N., Zanon, V., Braukmüller, N., Kronz, A., Le Moigne, Y., & Michon, L. Eruptive Activity on the Western Flank of Piton de la Fournaise (La Réunion Island, Indian Ocean): Insights on Magma Transfer, Storage and Evolution at an Oceanic Volcanic Island. United Kingdom. https://doi.org/10.1093/petrology/egz045
Boudoire, G., Brugier, Y. -A, Di Muro, A., Wörner, G., Arienzo, I., Metrich, N., Zanon, V., Braukmüller, N., Kronz, A., Le Moigne, Y., and Michon, L. Fri .
"Eruptive Activity on the Western Flank of Piton de la Fournaise (La Réunion Island, Indian Ocean): Insights on Magma Transfer, Storage and Evolution at an Oceanic Volcanic Island". United Kingdom. https://doi.org/10.1093/petrology/egz045.
@article{osti_1771844,
title = {Eruptive Activity on the Western Flank of Piton de la Fournaise (La Réunion Island, Indian Ocean): Insights on Magma Transfer, Storage and Evolution at an Oceanic Volcanic Island},
author = {Boudoire, G. and Brugier, Y. -A and Di Muro, A. and Wörner, G. and Arienzo, I. and Metrich, N. and Zanon, V. and Braukmüller, N. and Kronz, A. and Le Moigne, Y. and Michon, L.},
abstractNote = {Abstract Petrological and geochemical (major element, trace element, Sr–Nd isotope) data for recent (<5 kyr old) basalts that sporadically erupt on the western flank of Piton de la Fournaise (PdF), one of the most active volcanoes on Earth, allow the tracking of magma transfer and evolution from mantle to crustal depths. In the western peripheral area of PdF we document the broadly synchronous eruptions of (1) primitive olivine and olivine–clinopyroxene transitional basalts with tholeiitic affinity that are closely associated in space with (2) transitional olivine basalts with alkaline affinity, and (3) hybrid lavas, intermediate between the ‘alkaline’ and the ‘tholeiitic’ end-members. The composition of the latter overlaps with that of the lavas frequently erupted from the conduit system feeding the main summit cone. AlphaMELTS modelling, and fluid inclusion and clinopyroxene barometry, constrain the conditions of magma storage at 10–30 km, and the ascent of magma from the upper mantle to the shallow crustal plumbing system. Variable degrees of mantle melting, together with minor source heterogeneity and contamination with cumulate-derived partial melts, contribute to the diversity of PdF magmas. However, all these processes do not represent the dominant factors that produce the large variability we found in major element composition. Indeed, the composition of basalts erupted from PdF peripheral centers is strongly controlled by polybaric olivine–clinopyroxene fractionation at pressures higher than 3 kbar. Crystal textures and geochemical modelling suggest that fast magma ascent is critical to prevent clinopyroxene dissolution. Conversely, long-lasting magma stagnation promotes pyroxene resorption and magma differentiation. ‘Central’ eruptions occurring close to the PdF summit cone emit variably more evolved melts, which result from olivine–clinopyroxene–plagioclase differentiation at intermediate–shallow pressure (<3 kbar and in most cases <1 kbar). Deep and extensive magma mixing before injection into the crustal magma conduit system, located below the summit region, results in the apparent homogeneity of basalts erupted from the central area. As regards ‘peripheral’ eruptions, deep-seated stagnation of basaltic melts and differentiation at the mantle–crust transition zone (c. 4 kbar) produces a range of magma compositions. We demonstrate that rapid magma ascent from deep-seated reservoirs can bypass the central plumbing system. The eruptions of these magmas both in the central area and on the densely populated flanks have major consequences in terms of volcanic hazard at PdF.},
doi = {10.1093/petrology/egz045},
journal = {Journal of Petrology},
number = 9,
volume = 60,
place = {United Kingdom},
year = {Fri Oct 18 00:00:00 EDT 2019},
month = {Fri Oct 18 00:00:00 EDT 2019}
}
https://doi.org/10.1093/petrology/egz045
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