High-resolution magnetics reveal the deep structure of a volcanic-arc-related basalt-hosted hydrothermal site (Palinuro, Tyrrhenian Sea)

Szitkar, Florent, Petersen, Sven, Caratori Tontini, Fabio and Cocchi, Luca (2015) High-resolution magnetics reveal the deep structure of a volcanic-arc-related basalt-hosted hydrothermal site (Palinuro, Tyrrhenian Sea) Geochemistry, Geophysics, Geosystems, 16 (6). pp. 1950-1961. DOI 10.1002/2015GC005769.

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Abstract

High-resolution magnetic surveys have been acquired over the partially sedimented Palinuro massive sulfide deposits in the Aeolian volcanic arc, Tyrrhenian Sea. Surveys flown close to the seafloor using an autonomous underwater vehicle (AUV) show that the volcanic-arc-related basalt-hosted hydrothermal site is associated with zones of lower magnetization. This observation reflects the alteration of basalt affected by hydrothermal circulation and/or the progressive accumulation of a nonmagnetic deposit made of hydrothermal and volcaniclastic material and/or a thermal demagnetization of titanomagnetite due to the upwelling of hot fluids. To discriminate among these inferences, estimate the shape of the nonmagnetic deposit and the characteristics of the underlying altered area—the stockwork—we use high-resolution vector magnetic data acquired by the AUV Abyss (GEOMAR) above a crater-shaped depression hosting a weakly active hydrothermal site. Our study unveils a relatively small nonmagnetic deposit accumulated at the bottom of the depression and locked between the surrounding volcanic cones. Thermal demagnetization is unlikely but the stockwork extends beyond the limits of the nonmagnetic deposit, forming lobe-shaped zones believed to be a consequence of older volcanic episodes having contributed in generating the cones.

Document Type: Article
Additional Information: AUV data such as bathymetry and magnetic raw data as well as processed data will be archived on dedicated servers by the Kiel Data Management Team (KDMT) in GEOMARs Ocean Science Information System (OSIS-Kiel). Contact information for access to these large volume data files and metadata information will be provided by the central OSIS-Kiel (https://portal. geomar.de/osis).
Keywords: hydrothermal, magnetism, seafloor massive sulfides, exploration, autonomous underwater vehicle (AUV), Palinuro, Tyrrhenian Sea, AUV Abyss, RV Poseidon, POS442
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems > Marine Mineralische Rohstoffe
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1002/2015GC005769
ISSN: 1525-2027
Expeditions/Models:
Date Deposited: 29 Jun 2015 09:36
Last Modified: 12 Apr 2017 11:20
URI: http://eprints.uni-kiel.de/id/eprint/29071

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