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Authors: Caracausi, A.*
Martelli, M.*
Nuccio, P. M.*
Paternoster, M.*
Fin, S.*
Title: Active degassing of mantle-derived fluid: A geochemical study along the Vulture line, southern Apennines (Italy
Title of journal: Journal of volcanology and geothermal research
Series/Report no.: /253 (2013)
Publisher: Elsevier Science Limited
Issue Date: 2013
DOI: 10.1016/j.jvolgeores.2012.12.005
Keywords: nonle gases
mantle degassing
Mt. Vulture
Abstract: We report the results of a geochemical study of gas emissions along a NE–SW transect in southern Italy in order to test the hypothesis that the region around Monte Vulture is affected by degassing of mantle-derived fluids through a lithospheric discontinuity. We also investigated lavas from the Monte Vulture volcano displaying 3He/4He (up to ~6.0 Ra) and Sr isotopes that are consistent with an origin inmantle that has hadminimal pollution from subducted Adriatic slab. Similar 3He/4He in fluids from around Mt. Vulture indicate that the deep volcanic systemis still degassing. Mantle-derived He occurs in fluids along the length of the Vulture line, reinforcing the hypothesis that it is a deep tectonic discontinuity along which mantle fluids and/or melts advect to the surface. The CO2/3He ratios are highly variable (2.7×108–2.15×1011) in response to processes such as gas dissolution into aquifers, addition of crustal gases and degassing fractionation.
Appears in Collections:04.04.12. Fluid Geochemistry
Papers Published / Papers in press

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