Preprints
https://doi.org/10.5194/egusphere-2023-397
https://doi.org/10.5194/egusphere-2023-397
14 Mar 2023
 | 14 Mar 2023

Hydrothermal activity of the Lake Abhe geothermal field (Djibouti): Structural controls and paths for further exploration

Bastien Walter, Yves Géraud, Alexiane Favier, Nadjib Chibati, and Marc Diraison

Abstract. Lake Abhe is sitting on the Gob Aad graben within the tectonic Afar triangle in the Republic of Djibouti. It is known for its exposures of massive hydrothermal chimneys on the lake’s eastern shore. The many hydrothermal surface manifestations on this side of the lake, including steam vents, hot springs and carbonate chimney structures, reflect the geothermal field of this area. This study describes the structural settings of the Lake Abhe Geothermal Field (LAGF), using multiscale structural lineament distribution mapping. It also investigates the hydrothermal surface manifestations distribution in order to specify structural controls on local fluid flow and discuss its evolution. Structural features of the LAGF area are dominated by ESE-trending extensional faults that form a series of narrow elongated horst, graben and half-graben structures. Fault interaction and accommodation zones, as well as fault intersections, relay ramps and possible breaching faults are also recognized and may represent interesting structural features in terms of fluid flow pathways. Hydrothermal chimneys and hot springs distribution over the LAGF area is controlled by the main structural trends, and show signs of higher hydrothermal activity located at intersecting structural traces. Field observations, in conjunction with satellite images analysis, suggest a progressive lateral evolution of the LAGF hydrothermal fluid outflows over time. Therefore, this study provides new insights on the local tectonically driven fluid flow of the LAGF, that may support further exploration of this remarkable site and may promote its geothermal development.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Bastien Walter, Yves Géraud, Alexiane Favier, Nadjib Chibati, and Marc Diraison

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-397', Anonymous Referee #1, 16 Mar 2023
    • AC1: 'Reply on RC1', Bastien Walter, 03 Jul 2023
  • RC2: 'Comment on egusphere-2023-397', Anonymous Referee #2, 29 Mar 2023
    • AC2: 'Reply on RC2', Bastien Walter, 03 Jul 2023

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-397', Anonymous Referee #1, 16 Mar 2023
    • AC1: 'Reply on RC1', Bastien Walter, 03 Jul 2023
  • RC2: 'Comment on egusphere-2023-397', Anonymous Referee #2, 29 Mar 2023
    • AC2: 'Reply on RC2', Bastien Walter, 03 Jul 2023
Bastien Walter, Yves Géraud, Alexiane Favier, Nadjib Chibati, and Marc Diraison
Bastien Walter, Yves Géraud, Alexiane Favier, Nadjib Chibati, and Marc Diraison

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Short summary
Lake Abhe in southwestern Djibouti is known for its exposures of massive hydrothermal chimneys and hot springs on the lake’s eastern shore. This study highlights the control of the main structural faults of the area on the development of these hydrothermal features. This work contributes to better understand hydrothermal fluid pathways in this area and may help further exploration for the geothermal development of this remarkable site.