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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
Issue Date: 2013
Series/Report no.: /253 (2013)
DOI: 10.1016/j.jvolgeores.2012.12.005
Keywords: nonle gases
mantle degassing
Mt. Vulture
Subject Classification04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
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.
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