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Seafloor doming driven by degassing processes unveils sprouting volcanism in coastal areas
Author(s)
Language
English
Obiettivo Specifico
2V. Struttura e sistema di alimentazione dei vulcani
Status
Published
JCR Journal
JCR Journal
Title of the book
Issue/vol(year)
/6 (2016)
Electronic ISSN
2045-2322
Pages (printed)
22448
Issued date
March 1, 2016
Abstract
We report evidences of active seabed doming and gas discharge few kilometers offshore from the Naples harbor (Italy). Pockmarks, mounds, and craters characterize the seabed. These morphologies represent the top of shallow crustal structures including pagodas, faults and folds affecting the present-day seabed. They record upraise, pressurization, and release of He and CO2 from mantle melts and decarbonation reactions of crustal rocks. These gases are likely similar to those that feed the hydrothermal systems of the Ischia, Campi Flegrei and Somma-Vesuvius active volcanoes, suggesting the occurrence of a mantle source variously mixed to crustal fluids beneath the Gulf of Naples. The seafloor swelling and breaching by gas upraising and pressurization processes require overpressures in the order of 2-3 MPa. Seabed doming, faulting, and gas discharge are manifestations of non-volcanic unrests potentially preluding submarine eruptions and/or hydrothermal explosions.
Type
article
File(s)
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Name
Passaro et al 2016 Scient Rep.pdf
Size
2.05 MB
Format
Adobe PDF
Checksum (MD5)
02748c9042ceeb14bac5925ed71f5544