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Authors: De Ritis, R.* 
Ravat, D.* 
Ventura, G.* 
Chiappini, M.* 
Title: Curie isotherm depth from aeromagnetic data constraining shallow heat source depths in the central Aeolian Ridge (Southern Tyrrhenian Sea, Italy)
Journal: Bulletin of Volcanology 
Series/Report no.: /75(2013)
Publisher: Springer
Issue Date: 20-Mar-2013
DOI: 10.1007/s00445-013-0710-9
Keywords: Magnetic spectral depths
Curie temperature
Aeolian Islands
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 
04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models 
04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
04. Solid Earth::04.07. Tectonophysics::04.07.03. Heat generation and transport 
04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 
Abstract: The Salina, Lipari, and Vulcano volcanic ridge and the surrounding sea sectors (Aeolian Archipelago, Southern Tyrrhenian Sea, Italy) are characterized by vents responsible for a recent (<40 ka—1889/1890 AD) effusive and explosive subareal activity and repeated, 56 to 7 ka in age, submarine explosive eruptions from source areas located between Lipari and Vulcano. A spectral depth estimation of the magnetic bottom using a fractal method on aeromagnetic data from Vulcano, Lipari, and Salina volcanic ridge allows us to constrain the Curie isotherm depth. The elevated portion of the isotherm is between 2 and 3 km below Salina and Vulcano and about 1 km below Lipari. The Curie depth results in the context of other geological and geophysical evidence suggest that the rise of the Curie isotherm is mainly due to the occurrence of shallow heat sources such as magma ponds and associated hydrothermal systems. The short-wavelength magnetic anomaly field reflects magnetic contrasts from highly magnetized volcanic bodies, low-magnetization sediments, and hydrothermally altered rocks. Borehole temperature data verify the Curie temperature derived from the magnetic methods on the island of Vulcano.We conclude that the whole Vulcano, Lipari, and Salina volcanic ridge is active and should be monitored.
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