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Helium and argon isotopic compositions of mantle xenoliths from Tallante and Calatrava, Spain. (Articolo in rivista)
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- Helium and argon isotopic compositions of mantle xenoliths from Tallante and Calatrava, Spain. (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Alternative label
Martelli, M.(1), Bianchini, G.(2)(3) , Beccaluva, L.(1) , Rizzo, A.(1) (2011)
Helium and argon isotopic compositions of mantle xenoliths from Tallante and Calatrava, Spain.
in Journal of volcanology and geothermal research; Elsevier, Amsterdam (Paesi Bassi)
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- Martelli, M.(1), Bianchini, G.(2)(3) , Beccaluva, L.(1) , Rizzo, A.(1) (literal)
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- ID_PUMA: /cnr.igg/2011-A0-045.Area di valutazione 04 - Scienze della Terra (literal)
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- (1) Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Italy; (2) Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Pisa, Italy; (3) Dipartimento di Scienze della Terra, Università di Ferrara, Italy. (literal)
- Titolo
- Helium and argon isotopic compositions of mantle xenoliths from Tallante and Calatrava, Spain. (literal)
- Abstract
- We have analyzed by single-step crushing helium and argon isotopes in olivine and orthopyroxene from
mantle xenoliths of Calatrava (CLV) in central Spain and Tallante (TL) in southeast Spain. The investigation
focused on carefully selected samples previously characterized in terms of major and trace elements on both
bulk rock and constituent minerals, and Sr and Nd isotopes on clinopyroxene separates. Six analyses were
performed on protogranular spinel lherzolites from CLV, and 17 were performed on spinel harzburgites,
lherzolites, and orthopyroxenites from TL. The 40Ar/36Ar ratio was between 296 and 622, indicating
atmospheric contamination, which probably occurred during exposure to the surface. The helium-isotope
ratio (3He/4He) ranged between 3.6 and 6.5 Ra in CLV samples and between 1.4 and 5.7 Ra in TL samples.
There was a positive correlation between the 3He/4He and 4He/40Ar* ratios, possibly reflecting diffusive
fractionation between 3He, 4He, and 40Ar within mantle sections interacting with ascending melts. However,
the difference between the maximum 3He/4He ratios measured in CLV and TL appears to be related to
significant differences in the metasomatic melts that affected the two sectors of the lithospheric mantle.
In agreement with the findings of previous studies, the helium isotopes at CLV are compatible with
metasomatism due to ascending HIMU-type asthenospheric melts. In contrast, the lower 3He/4He values
recorded at TL suggest subduction-related metasomatic components that are possibly related to the Cenozoic
subduction of the Betic system. Such event plausibly introduced crust-derived fluids that metasomatized the
mantle wedge, slightly decreasing its 3He/4He value. Noble gases appear decoupled from other elements
during these mantle processes, since comparatively low 3He/4He values have been recorded also in samples
that are relatively unmetasomatized in terms of incompatible lithophile elements. We hypothesize a role for
volatile-dominated, CO2-rich fluids progressively decoupling from the ascending metasomatic melts and
migrating in the surrounding peridotite matrix to form a diffuse aureola enriched in noble gases. (literal)
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