Crustal and uppermost mantle structure variation beneath La Réunion hotspot track

Fontaine, Fabrice R.; Barruol, Guilhem; Tkalčić, Hrvoje; Wölbern, Ingo; Rümpker, Georg; Bodin, Thomas; Haugmard, Méric

doi:10.1093/gji/ggv279

Cited by 65 publications

(84 citation statements)

References 113 publications

(134 reference statements)

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“…Leahy et al 2010;Lodge et al 2012;Fontaine et al 2015), but previous studies of hot-spot related islands in the vicinity of an ocean ridge found no evidence for underplating (e.g. Staples et al 1997;Evangelidis et al 2004).…”

Section: Underplatingmentioning

confidence: 88%

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Constraints on the structure of the crust and lithosphere beneath the Azores Islands from teleseismic receiver functions

Spieker

Rondenay

Ramalho

et al. 2018

Geophysical Journal International

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Section: Underplatingmentioning

confidence: 88%

“…Magmatic underplating seems to be a common but not universal feature of hot-spot volcanism (e.g. Lodge & Helffrich 2006;Leahy et al 2010;Lodge et al 2012;Fontaine et al 2015). It has mostly been found beneath oceanic volcanic structures emplaced in strong and old lithosphere.…”

Section: Introductionmentioning

confidence: 99%

Constraints on the structure of the crust and lithosphere beneath the Azores Islands from teleseismic receiver functions

Spieker

Rondenay

Ramalho

et al. 2018

Geophysical Journal International

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“…Hypocenters during the 2014 seismic crisis below La Plaine des Palmistes were concentrated at depth ranging between 15 and 21 km bsl (18 km bsl on average; Fig. 10b) and were located close to the limit of the 'petrological' Moho defined by the underplating layer below the Indian oceanic crust (Gallart et al, 1999;Fontaine et al, 2015;Michon et al, 2015;Boudoire et al, in prep). The southern end of this seismic zone is spatially connected to the N135° Songit Lineament, whose hypocenters depths are about 5 km greater on average, ranging between 19 and 28 km bsl.…”

Section: Origin Of the Songit Lineamentmentioning

confidence: 99%

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

Boudoire

Liuzzo

Muro

et al. 2017

Journal of Volcanology and Geothermal Research

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Peripheral diffuse degassing of CO 2 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 δ 13 C) 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.

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“…His suggestion of a continental basement is mostly supported by the granite outcrop in the north of the Seychelles Islands [Davies and Francis, 1964;Shor and Pollard, 1963;Hammond et al, 2013]. A more recent study by Fontaine et al [2015] has reported a Moho depth of approximately 21 km based on a stack of five receiver functions (RFs) obtained at a single (permanent) station, MRIV, located on the island of Mauritius. Their conclusions are primarily based on the U-Pb dating of the zircons obtained from the beach sands and trachytes of Mauritius, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The crustal nature of the Mascarene plateau region has long been a topic of debate [Shor and Pollard, 1963;Pilipenko, 1992;Torsvik et al, 2013;Fontaine et al, 2015]. As described by Fisher et al [1967], the plateau is composed of submerged banks, volcanic islands, and other islets.…”

Section: Introductionmentioning

confidence: 99%

The crustal structure beneath Mauritius from teleseismic P receiver functions: Oceanic or continental?

Singh

Kaviani

Rümpker

2016

Geophysical Research Letters

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It has recently been suggested that the volcanic island of Mauritius may be underlain by a remnant of continental origin termed “Mauritia.” To constrain the crustal thickness beneath Mauritius, we analyzed data from 11 land stations, 10 of which were deployed recently by the RHUM‐RUM project. From the recordings, we obtained 382 P receiver functions (RFs). By applying the H‐κ stacking technique, we derive crustal thicknesses of approximately 10–15 km. We observe a considerable variation in the Vp/Vs ratio caused by a lack of clear multiples. Using forward modeling of RFs, we show that the lack of clear multiples can be explained by a transitional Moho, where the velocity increases gradually. The modeling further indicates that the thickness of this gradient zone is estimated to be approximately 10 km. We argue that our findings suggest oceanic crust thickened by crustal underplating due to the mantle plume currently located beneath La Réunion.

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Crustal and uppermost mantle structure variation beneath La Réunion hotspot track

Cited by 65 publications

References 113 publications

Constraints on the structure of the crust and lithosphere beneath the Azores Islands from teleseismic receiver functions

Constraints on the structure of the crust and lithosphere beneath the Azores Islands from teleseismic receiver functions

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

The crustal structure beneath Mauritius from teleseismic P receiver functions: Oceanic or continental?

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