The tectonically controlled emplacement of a vertically sheeted gabbro-pyroxenite intrusion: Feeder-zone of an ocean-island volcano (Fuerteventura, Canary Islands)

Allibon, James; Bussy, F.; Lewin, É.; Darbellay, Bastien

doi:10.1016/j.tecto.2010.01.011

Cited by 22 publications

(23 citation statements)

References 104 publications

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“…GPa (Allibon et al, 2011b;, in line with the expected lithostatic pressure at the base of the ca. 3000 m-high (Stillman 1999) overlying volcano.…”

Section: Accepted Manuscriptsupporting

confidence: 82%

“…The thickness of these dikes or bodies varies from several centimeters to a few meters. The layering is oriented NNE-SSW, except in the northwestern part of the pluton, where it changes to WNW-ESE (Allibon et al, 2011b). These orientations reflect the extensional rift-like regime that affected the island during the Lower Miocene (Fernández et al, 1997).…”

Section: Accepted Manuscriptmentioning

confidence: 91%

“…As the regional tectonic setting during PX1 growth was transtensive to extensive (Fernández et al, 1997), it is unlikely that pressure gradients were induced in this way. Allibon et al (2011b) proposed that forceful injections in previously emplaced crystal-rich channels could generate the required horizontal pressure gradient through mush compaction, producing residual melt extraction. Extraction could also be simply due to the effect of lithostatic pressure.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Thermal model of successive dike injections and implications for the development of intraplate volcanoes

Tornare

Bessat

François

2018

Lithos

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Temperatures in the root zones of volcanoes play a critical role in the development and persistence of shallow-level magmatic reservoirs in the crust. Here, we present a 1D thermal model allowing evaluation of the thermal impact of magma travelling in conduits to the surface on the root zone of a volcano. This thermal model has been developed to better understand the formation of a vertical intrusion located in the root zone of a dismembered Miocene volcano on Fuerteventura, Canary Archipelago. This intrusion, named PX1, constitutes an almost pure amalgamation of dikes of either clinopyroxenitic or gabbroic composition. Both types of dikes display cumulate textures and are interpreted as resulting from the protracted crystallization of a mafic magma. The formation of clinopyroxenitic, in contrast to gabbroic dikes, requires that the residual melt was extracted at high temperature (>1050°) to avoid plagioclase crystallization. Simulations of multiple dike injections show that the temperature in the root zone increases significantly with the addition of dikes, but the maximum temperature reached in the system depends on the duration of magma flow in the conduits and the time interval between dike injections (i.e., repose period). Active flow is the critical parameter that distinguishes instantaneous dike injection from a magmatic conduit. Without significant magma flow (>1 month), hightemperature conditions (>1000°C) cannot be maintained in the pluton unless dikes are very thick and the repose period is extremely small. On the other hand, magma flow times of one to several months, combined with short time intervals between dike injections (<25 years), which are conditions comparable to those recorded for historical eruptions of oceanic island volcanoes, allow the production and preservation of temperatures above the plagioclase liquidus for significant durations, as required to generate clinopyroxenitic dikes such as those observed in the PX1 pluton. Persistent high temperature in the vicinity of magma conduits limits the differentiation of melts in transit to the surface, providing a potential explanation for why lavas of mafic to intermediate composition predominate in intraplate volcanoes such as Fuerteventura or Fogo Island (Cape Verde

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“…GPa (Allibon et al, 2011b;, in line with the expected lithostatic pressure at the base of the ca. 3000 m-high (Stillman 1999) overlying volcano.…”

Section: Accepted Manuscriptsupporting

confidence: 82%

Section: Accepted Manuscriptmentioning

confidence: 91%

Section: Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Thermal model of successive dike injections and implications for the development of intraplate volcanoes

Tornare

Bessat

François

2018

Lithos

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“…The intrusive units recognized in Central Fuerteventura island are heterogeneous and correspond to a layered intrusive body (Stillman et al, 1975;Allibon et al, 2011), making it possible to consider that certain complex basal intrusive units have different permeability, in some cases favoring some small groundwater flow and in other cases blocking it.…”

Section: Discussionmentioning

confidence: 99%

Groundwater flow in a relatively old oceanic volcanic island: The Betancuria area, Fuerteventura Island, Canary Islands, Spain

Herrera¹,

Custódio²

2014

Science of The Total Environment

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“…Their position varies in space and time rather than being fixed at a single central point, like may be the case with the axial melt lens in fast-spreading ridges (e.g., Coogan et al, 2002). Igneous complexes are thus built up incrementally, by accretion of successive sills or dykes (e.g., Dick et al, 2008;Allibon et al, 2011;Leuthold et al, 2014b).…”

Section: Introductionmentioning

confidence: 99%

Partial Melting of Lower Oceanic Crust Gabbro: Constraints From Poikilitic Clinopyroxene Primocrysts

et al. 2018

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Cross-section of slow-spreading ridges, showing the different occurrences of melt in the oceanic crust (based on Sinton and Detrick, 1992; Dick et al., 2008). Gabbro s.l. includes troctolite, olivine-gabbro, gabbro, gabbronorite and ferrogabbro. Also dunite occurs along the Moho. Young hot crustal gabbro reacts (i.e., partial melting, hybridization, recrystallization) with invading primitive mantle-derived melt. Crystals, rocks and melt chemistry and texture are modified.

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The tectonically controlled emplacement of a vertically sheeted gabbro-pyroxenite intrusion: Feeder-zone of an ocean-island volcano (Fuerteventura, Canary Islands)

Cited by 22 publications

References 104 publications

Thermal model of successive dike injections and implications for the development of intraplate volcanoes

Thermal model of successive dike injections and implications for the development of intraplate volcanoes

Groundwater flow in a relatively old oceanic volcanic island: The Betancuria area, Fuerteventura Island, Canary Islands, Spain

Partial Melting of Lower Oceanic Crust Gabbro: Constraints From Poikilitic Clinopyroxene Primocrysts

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