Gas discharges for continental Spain: geochemical and isotopic features

Vaselli, Orlando and Nisi, Bárbara and Franco, T. and Darrah, T. and Bruno, J. and Elio Medina, Javier de and Grandia, Fidel and Perez del Villar, Luis (2013). Gas discharges for continental Spain: geochemical and isotopic features. In: "Goldschmidt 2013", 25-30 de agosto, Florencia. ISBN 0026-461X. https://doi.org/10.1180/minmag.2013.077.5.22.

Description

Title: Gas discharges for continental Spain: geochemical and isotopic features
Author/s:
  • Vaselli, Orlando
  • Nisi, Bárbara
  • Franco, T.
  • Darrah, T.
  • Bruno, J.
  • Elio Medina, Javier de
  • Grandia, Fidel
  • Perez del Villar, Luis
Item Type: Presentation at Congress or Conference (Lecture)
Event Title: Goldschmidt 2013
Event Dates: 25-30 de agosto
Event Location: Florencia
Title of Book: Goldschmidt2013 Conference Abstracts
Date: August 2013
ISBN: 0026-461X
Volume: 77 (5)
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Explotación de Recursos Minerales y Obras Subterráneas [hasta 2014]
Creative Commons Licenses: None

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (2MB) | Preview

Abstract

In this work the results of a geochemical and isotopic survey of 37 gas discharges was carried out in continental Spain are presented and discussed. On the basis of the gas chemical composition, four different areas can be distinguished, as follows: 1) Selva-Emborda (SE) region; 2) Guadalentin Valley (GV); 3) Campo de Calatrava (CC) and 3) the inner part of Spain (IS). The SE, GV and CC areas are characterized by CO2-rich gases, while IS has N2 as main gas compound. The CO2-rich gases can be distinguished at their turn on the basis on the helium and carbon isotopic composition. The SE and CC areas have a strong mantle signature (up to 3 Ra). Nevertheless, the carbon isotopic composition of CC is within the mantle range and that of SE is slightly more negative (down to -8‰ PDB). The GV gases have a lower mantle signature (61 Ra) with respect to SE and CC and more negative carbon isotopes (6-10‰ PDB). It is worth to mention that the SE, GV and CC areas are related to the youngest volcanic activity in continental Spain, for example the Garrotxa Volcanic Field in Catalonia records the latest event dated at 10,000 years, and the isotopic features, particularly those of helium, are suggesting the presence of magmatic bodies still cooling at depth. The N2-rich gases, i.e. those from the IS area, has an atmospheric origin, as highlighted by the N2/Ar ratio that ranges between those of air and ASW (Air Saturated Water). The isotopic composition of carbon is distinctly negative (down to -21‰ PDB) and that of helium is typically crustal (0.02-0.08 Ra), confirming that these gas discharges are related to a relatively shallow source.

More information

Item ID: 20195
DC Identifier: http://oa.upm.es/20195/
OAI Identifier: oai:oa.upm.es:20195
DOI: 10.1180/minmag.2013.077.5.22
Deposited by: Javier Elio Medina
Deposited on: 02 Jan 2014 19:21
Last Modified: 13 Nov 2014 12:11
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM