Forearc structure in the Lesser Antilles inferred from depth to the Curie temperature and thermo-mechanical simulations

Gailler, Lydie-Sarah; Arcay, Diane; Münch, Philippe; Martelet, Guillaume; Thinon, Isabelle; Lebrun, Jean‐Frédéric

doi:10.1016/j.tecto.2017.03.014

Cited by 6 publications

(3 citation statements)

References 117 publications

(109 reference statements)

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“…Blakely, 1988;Tanaka et al, 1999:~5800 × 10 3 km 2 ) or at shallow depth in smaller areas (e.g. Gailler et al, 2016Gailler et al, , 2017:~810 × 10 3 km 2 ). Electrical measurements are well suited for imaging the interior of active volcanoes, because the resistivity of volcanic rocks spans several orders of magnitude (Lénat, 1995) and because magmas have the lowest resistivity values in volcanic environment ranging from about 20 to b1 Ω.m (see Lénat, 1995 and references therein).…”

Section: Introductionmentioning

confidence: 99%

3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)

Gailler

Kauahikaua

Lénat

et al. 2019

Journal of Volcanology and Geothermal Research

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Before the 2018 collapse of the summit of Kīlauea volcano, a ca. 200 m in diameter lava lake inside of Halema'uma'u crater was embedded in a very active hydrothermal system. In 2015, we carried out an electrical conductivity survey and the data were inverted in 3D. The lack of conductivity contrast precludes distinguishing the lava column from the surrounding hydrothermal zones. Laboratory measurements on samples from the lava lake show that the conductivity of magma is significantly lower than that of hydrothermal zones but the high vesicularity of the upper part of the lava lake may decrease its macroscopic conductivity. Based on the 3D conductivity model, we distinguish at least two types of hydrothermal circulations: 1) one guided by the collapse faults of Halema'uma'u crater and by the magmatic column of the lava lake, and 2) another guided by previous caldera faults and fractures related to intrusions. We observe that the location of the faults formed during the 2018 collapse of the summit was greatly influenced by the hydrothermally altered zones.

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Section: Introductionmentioning

confidence: 99%

3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)

Gailler

Kauahikaua

Lénat

et al. 2019

Journal of Volcanology and Geothermal Research

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“…Indeed, it has been proposed that the subduction of aseismic ridges provides fluids that can lubricate the subduction interface in turn promoting aseismic creep along the megathrust or enhancing small earthquakes occurrence(Chlieh et al, 2008;Schlaphorst et al, 2016;Saillard et al, 2017). Fluids may also be responsible for high serpentinization of the supraslab mantle beneath the northern Lesser Antilles arc as proposed byGailler et al (2017).…”

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Decreasing uplift rates and Pleistocene marine terraces settlement in the central lesser Antilles fore-arc (La Désirade Island, 16°N)

Léticée

Cornée

Münch

et al. 2019

Quaternary International

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“…Toward the trench, the Moho finally disappears in serpentinite diapirs (Takahashi et al, ). Such a shallow Moho and interplate decoupling are also inferred for the Caribbean fore arc (Gailler et al, ). All these may imply that due to shallow slab‐mantle decoupling depth, eclogitization of the slab takes place after coupling with the mantle wedge.…”

Section: Discussionmentioning

confidence: 99%

Tectonic Stacking of HP/LT Metamorphic Rocks in Accretionary Wedges and the Role of Shallowing Slab‐Mantle Decoupling

Aygül

Oberhänsli

2017

Tectonics

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High‐pressure/low‐temperature (HP/LT) chloritoid‐bearing micaschists crop out widely in the central part of northern Turkey and represent deep‐seated subduction‐accretionary complexes. Three peak metamorphic assemblages are identified in the area studied: (1) garnet‐chloritoid‐glaucophane with pseudomorphs after lawsonite; (2) chloritoid with pseudomorphs after glaucophane; and (3) chloritoid with pseudomorphs after jadeite in addition to phengite, paragonite, quartz, chlorite, rutile, and apatite. The latter is interpreted as transformation of a chloritoid + glaucophane assemblage to chloritoid + jadeite with increasing pressure; PT modeling indicates ~17 and 22–25 kbars for the two peak parageneses. The diversity of peak metamorphic assemblages and the PT estimates suggest that basal accretion occurred at different depths within the wedge. The depth of the basal accretion is possibly controlled by the slab‐mantle decoupling depth. Stretching and thinning of the lithospheric fore arc induced by the slab rollback possibly caused shallowing of the slab‐mantle decoupling depth which limited depth of the basal accretion from 70–80 km to ~55 km within the subduction channel. A slab‐mantle coupling depth‐controlled basal accretion may also explain the scarcity of eclogite and high‐grade blueschist facies metamorphic rocks in active intraoceanic subduction zones. Because the overriding plate is young and hot in intraoceanic subductions, the slab and mantle are coupled at a relatively shallow depth before eclogitization of the oceanic crust. This prevents accretion and exhumation of eclogite along the subduction channel.

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Forearc structure in the Lesser Antilles inferred from depth to the Curie temperature and thermo-mechanical simulations

Cited by 6 publications

References 117 publications

3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)

3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)

Decreasing uplift rates and Pleistocene marine terraces settlement in the central lesser Antilles fore-arc (La Désirade Island, 16°N)

Tectonic Stacking of HP/LT Metamorphic Rocks in Accretionary Wedges and the Role of Shallowing Slab‐Mantle Decoupling

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