Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
1950–1961
Description:
4V. Vulcani e ambiente
Description:
3A. Ambiente Marino
Description:
7A. Geofisica di esplorazione
Description:
JCR Journal
Description:
restricted
Keywords:
Hydrothermal alteration
;
magnetica anomalies
;
Palinuro Seamounts
;
Tyrrhenian Sea
;
04. Solid Earth::04.04. Geology::04.04.04. Marine geology
;
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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