scholarly journals Magnetic Expression of Hydrothermal Systems Hosted by Submarine Calderas in Subduction Settings: Examples from the Palinuro and Brothers Volcanoes

Geosciences ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 504
Author(s):  
Luca Cocchi ◽  
Fabio Caratori Tontini ◽  
Filippo Muccini ◽  
Cornel E. J. de Ronde
Keyword(s):  
Large Scale ◽  
Hydrothermal Systems ◽  
Magnetic Data ◽  
Tyrrhenian Sea ◽  
3D Inversion ◽  
Common Features ◽  
Cyclic Processes ◽  
Southern Tyrrhenian Sea ◽  
Back Arc ◽  
Hydrothermal Venting

Volcanism is the most widespread expression of cyclic processes of formation and/or destruction that shape the Earth’s surface. Calderas are morphological depressions resulting from the collapse of a magma chamber following large eruptions and are commonly found in subduction-related tectono-magmatic regimes, such as arc and back-arc settings. Some of the most impressive examples of seafloor hydrothermal venting occur within submarine calderas. Here, we show the results of magnetic investigations at two hydrothermally active submarine calderas, i.e., Palinuro Seamount in the Southern Tyrrhenian Sea, Italy, and Brothers volcano of the Kermadec arc, New Zealand. These volcanoes occur in different geodynamic settings but show similarities in the development of their hydrothermal systems, both of which are hosted within calderas. We present a new integrated model based on morphological, geological and magnetic data for the Palinuro caldera, and we compare this with the well-established model of Brothers caldera, highlighting the differences and common features in the geophysical expressions of both hydrothermal systems. For consistency with the results at Brothers volcano, we build a model of demagnetised areas associated with hydrothermal alteration derived from 3D inversion of magnetic data. Both these models for Brothers and Palinuro show that hydrothermal up-flow zones are strongly controlled by caldera structures which provide large-scale permeability pathways, favouring circulation of the hydrothermal fluids at depth.

Near-Bottom Magnetic Signatures of Submarine Hydrothermal Systems at Marsili and Palinuro Volcanoes, Southern Tyrrhenian Sea, Italy

2014 ◽  
Vol 109 (8) ◽  
pp. 2119-2128 ◽  
Author(s):  
F. Caratori Tontini ◽  
G. Bortoluzzi ◽  
C. Carmisciano ◽  
L. Cocchi ◽  
C. E. J. de Ronde ◽  
...  
Keyword(s):  
Hydrothermal Systems ◽  
Tyrrhenian Sea ◽  
Magnetic Signatures ◽  
Submarine Hydrothermal Systems ◽  
Southern Tyrrhenian Sea

scholarly journals GEOSTAR deep seafloor missions: magnetic data analysis and 1D geoelectric structure underneath the Southern Tyrrhenian Sea

2010 ◽  
Vol 52 (1) ◽  
Author(s):  
Sergio Vitale ◽  
Angelo De Santis ◽  
Domenico Di Mauro ◽  
Lili Cafarella ◽  
Paolo Palangio ◽  
...  
Keyword(s):  
Data Analysis ◽  
Magnetic Data ◽  
Tyrrhenian Sea ◽  
Southern Tyrrhenian Sea

scholarly journals Open-slope, translational submarine landslide in a tectonically active volcanic continental margin (Licosa submarine landslide, southern Tyrrhenian Sea)

2018 ◽  
Vol 477 (1) ◽  
pp. 133-150 ◽  
Author(s):  
M. Sammartini ◽  
A. Camerlenghi ◽  
F. Budillon ◽  
D. D. Insinga ◽  
F. Zgur ◽  
...  
Keyword(s):  
Slope Stability ◽  
Continental Margin ◽  
Submarine Landslide ◽  
Tyrrhenian Sea ◽  
Structural Discontinuity ◽  
Tectonically Active ◽  
Southern Tyrrhenian Sea ◽  
Multichannel Seismics ◽  
Back Arc ◽  
Detachment Surface

AbstractThe southern Tyrrhenian continental margin is the product of Pliocene–Recent back-arc extension. An area of approximately 30 km2 of gentle (about 1.5°) lower slope of the last glacial outer shelf sedimentary wedge in water depths of between 200 and 300 m failed between 14 and 11 ka BP. We approached the landslide by multibeam and sub-bottom profiler surveying, high-resolution multichannel seismics, and coring for stratigraphic and geotechnical purposes. With regard to a slope-stability analysis, we carried out an assessment of the stratigraphic and structural setting of the area of the Licosa landslide. This analysis revealed that the landslide detached along a marker bed that was composed of the tephra layer Y-5 (c. 39 ka). Several previously unknown geological characteristics of the area are likely to have affected the slope stability. These are the basal erosion of the slope in the Licosa Channel, a high sedimentation rate in the sedimentary wedge, earthquake shaking, the volcanic ash nature of the detachment surface, subsurface gas/fluid migration, and lateral porewater flow from the depocentre of wedge to the base of the slope along the high-permeability ash layers. A newly discovered prominent structural discontinuity is identified as the fault whose activity may have triggered the landslide.

scholarly journals New Insights of the Sicily Channel and Southern Tyrrhenian Sea Variability

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1355 ◽  
Author(s):  
Milena Menna ◽  
Pierre-Marie Poulain ◽  
Daniele Ciani ◽  
Andrea Doglioli ◽  
Giulio Notarstefano ◽  
...  
Keyword(s):  
Large Scale ◽  
Decadal Variability ◽  
Internal Variability ◽  
Surface Currents ◽  
Tyrrhenian Sea ◽  
Ionian Sea ◽  
Dynamic Topography ◽  
Argo Float ◽  
Southern Tyrrhenian Sea ◽  
Sicily Channel

The dynamics of the Sicily Channel and the southern Tyrrhenian Sea are highly influenced by the seasonal variability of the Mediterranean basin-wide circulation, by the interannual variability of the numerous mesoscale structures present in the Channel, and by the decadal variability of the adjacent Ionian Sea. In the present study, all these aspects are investigated using in-situ (Lagrangian drifter trajectories and Argo float profiles) and satellite data (Absolute Dynamic Topography, Sea Level Anomaly, Sea Surface Temperature, wind products) over the period from 1993 to 2018. The availability of long time series of data and high-resolution multi-sensor surface currents allow us to add new details on the circulation features and on their driving mechanisms and to detect new permanent eddies not yet described in literature. The structures prevailing in winter are mainly driven by wind, whereas those prevailing in summer are regulated by topographical forcing on surface currents. The strength of the surface structures located at the western entrance of the Ionian Sea and of the mesoscale activity along the northern Sicily coast is modulated by the large-scale internal variability. The vertical hydrological characteristics of these mesoscale eddies are delineated using the Argo float profiles inside these structures.

Sign in / Sign up

Export Citation Format

Share Document