Active degassing of mantle-derived fluid: a geochemical study along the Vulture line, southern Apennines (Italy)

Caracausi, A., Martelli, M., Nuccio, P.M., Paternoster, M. and Stuart, F.M. (2013) Active degassing of mantle-derived fluid: a geochemical study along the Vulture line, southern Apennines (Italy). Journal of Volcanology and Geothermal Research, 253, pp. 65-74. (doi:10.1016/j.jvolgeores.2012.12.005)

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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 in mantle that has had minimal pollution from subducted Adriatic slab. Similar 3He/4He in fluids from around Mt. Vulture indicate that the deep volcanic system is 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stuart, Professor Finlay
Authors: Caracausi, A., Martelli, M., Nuccio, P.M., Paternoster, M., and Stuart, F.M.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Journal of Volcanology and Geothermal Research
ISSN:0377-0273

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