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Poster De Conférence Année : 2023

New Heat Flow Measurements in the Alboran Sea, westernmost Mediterranean Sea

Résumé

15 new heat flow measurements were obtained during the ALBACORE cruise (R/V Pourquoi Pas ?) in 2021 in the Alboran Sea, the westernmost part of the Mediterranean Sea. Temperature gradients were measured using autonomous thermal probes attached to sediment corers with a length of 6 meters. Thermal conductivity was measured onboard using a needle probe instrument on recovered sediment cores. In previous studies, a large difference in heat flow has been observed between the western and eastern parts of the Alboran Basin, 69 ± 6 mWm-2 versus 124 ± 8 mWm -2 . Here we focus on the mainly North-South Bokkoya and Al Idrissi active strike-slip fault zones between these two domains. Three heat flow profiles were performed perpendicular to the fault zones that show a marked difference in heat flow values along and between these profiles. The northern profile, 2.5 km long, indicates a homogeneous heat flow with a mean value of 65 mWm-2 . The middle profile shows a heterogeneous heat flow with a mean of 81 mWm-2 and variations of ± 30 mWm-2 over a 400 m distance. The southern profile indicates high and heterogeneous heat flow values varying between 155 and 204 mWm-2 over the 550 m long profile. These local thermal anomalies could be associated with hydrothermal activity along the fault segments. Transport of heat by hydrothermal circulation has been observed in different geological settings. In the Alboran sea basin, some segments of the active fault zones may thus display suitable pathway for hydrothermal circulation.
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Dates et versions

hal-04190641 , version 1 (29-08-2023)

Identifiants

  • HAL Id : hal-04190641 , version 1

Citer

Frédérique Rolandone, Sylvie Leroy, Jeffrey Poort, Léa Vidil, Alana Oliveira de Sa, et al.. New Heat Flow Measurements in the Alboran Sea, westernmost Mediterranean Sea. IUGG 2023, Jul 2023, Berlin, Germany. ⟨hal-04190641⟩
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