Gas discharges for continental Spain: geochemical and isotopic features

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

Descripción

Título: Gas discharges for continental Spain: geochemical and isotopic features
Autor/es:
  • Vaselli, Orlando
  • Nisi, Bárbara
  • Franco, T.
  • Darrah, T.
  • Bruno, J.
  • Elio Medina, Javier de
  • Grandia, Fidel
  • Perez del Villar, Luis
Tipo de Documento: Ponencia en Congreso o Jornada (Lectura)
Título del Evento: Goldschmidt 2013
Fechas del Evento: 25-30 de agosto
Lugar del Evento: Florencia
Título del Libro: Goldschmidt2013 Conference Abstracts
Fecha: Agosto 2013
ISBN: 0026-461X
Volumen: 77 (5)
Materias:
Escuela: E.T.S.I. Minas (UPM) [antigua denominación]
Departamento: Explotación de Recursos Minerales y Obras Subterráneas [hasta 2014]
Licencias Creative Commons: Ninguna

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Resumen

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.

Más información

ID de Registro: 20195
Identificador DC: http://oa.upm.es/20195/
Identificador OAI: oai:oa.upm.es:20195
Identificador DOI: 10.1180/minmag.2013.077.5.22
Depositado por: Javier Elio Medina
Depositado el: 02 Ene 2014 19:21
Ultima Modificación: 13 Nov 2014 12:11
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