Title :

The Concept of Exhumed Analogue for Characterization of High-Energy Geothermal Reservoir: an Example from Les Saintes Island (Guadeloupe Archipelago, Lesser Antilles) and Consequences for Exploration

Author(s) :

Favier, Alexiane [Auteur]
Géoazur [GEOAZUR 7329]
Géosciences Montpellier
Lardeaux, Jean-Marc [Auteur]
Géoazur [GEOAZUR 7329]
Verati, Chrystele [Auteur]
Géoazur [GEOAZUR 7329]
Corsini, Michel [Auteur]
Géoazur [GEOAZUR 7329]
Münch, Philippe [Auteur]
Géosciences Montpellier
Ventalon, sandra [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Conference title :

World Geothermal Congress 2020+1

Conference organizers(s) :

IGA

City :

Reykjavik

Country :

Islande

Start date of the conference :

2021-04-01

Book title :

Proceedings World Geothermal Congress 2020+1

Journal title :

Proceedings World Geothermal Congress 2020+1

Publisher :

World Geothermal Congress

Publication place :

Reykjavik, Iceland

Publication date :

2021-04-01

English keyword(s) :

Lesser Antilles volcanic arc
high-enthalpy geothermal field
exhumed paleo-reservoir
hydrothermal transformations
model for fluids pathways

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre
Planète et Univers [physics]
Planète et Univers [physics]/Sciences de la Terre/Géologie appliquée
Planète et Univers [physics]/Sciences de la Terre/Géochimie
Planète et Univers [physics]/Sciences de la Terre/Minéralogie
Planète et Univers [physics]/Sciences de la Terre/Pétrographie
Planète et Univers [physics]/Sciences de la Terre/Tectonique
Planète et Univers [physics]/Sciences de la Terre/Volcanologie

English abstract : [en]

The recognition of a fossil equivalent of the active geothermal system of the Basse-Terre Island in Guadeloupe archipelago (Lesser Antilles arc) in Terre-de-Haut Island (Les Saintes archipelago) allow us to better constrain ...
Show more >The recognition of a fossil equivalent of the active geothermal system of the Basse-Terre Island in Guadeloupe archipelago (Lesser Antilles arc) in Terre-de-Haut Island (Les Saintes archipelago) allow us to better constrain the structure, the mineralogy and the petrological characters of the deep parts of an active geothermal reservoir. First, we demonstrate the occurrence, in Terre-de-Haut Island, of an exhumed analogue of the deeper parts Bouillante geothermal field. In this exhumed paleo-geothermal reservoir we characterize the nature and the P-T evolutions of the hydrothermal mineral associations in relation with fluids transfers. Moreover, high-temperature hydrothermal activity is coeval with the development of ductile tectonic structures, particularly schistose corridors, and is dated at 2.59 ± 0.12 Ma on white micas, involving maximum activity of 600 ky. These data provide a conceptual model, including brittle-ductile transition located at a depth between 2.5 and 4 km. In this way, brittle and ductile tectonic structures are efficient drains to connected vertical and lateral fluids and heat transfers. This may provide new guides for exploration of geothermal resources in volcanic arcs.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL