AustralieFrV1, Istex, Curation, bibRecord, 002761

Mantle-derived volatiles in continental crust: the Massif Central of France

Identifieur interne : 002761 ( Istex/Curation ); précédent : 002760; suivant : 002762

Mantle-derived volatiles in continental crust: the Massif Central of France

Auteurs : A. Matthews [Royaume-Uni, Israël] ; C. Fouillac [France] ; R. Hill [Royaume-Uni, Australie] ; R. K. O'Nions [Royaume-Uni] ; E. R. Oxburgh [Royaume-Uni]

Source :

Earth and Planetary Science Letters [ 0012-821X ] ; 1987.

RBID : ISTEX:D4136AE8AF5CA94FEF8F3093425116B043864F5D

Descripteurs français

Wicri :
- topic : Sciences de la terre.

English descriptors

Abstract

Abstract: CO2-rich gases and groundwaters from springs and boreholes originating within the basement of the Massif Central have variable3He/4He ratios with correspondingR/Ra values ranging from 0.8 to 5.5 and 0.3 to 2.8 respectively, indicating the presence of a significant component of mantle helium. Molar concentrations of rare gases in the CO2-rich gases are approximately 5 orders of magnitude greater than in the waters and suggest that a near-surface Henry's Law fractionation has occurred between exsolving CO2 and water.δ13C values of the CO2-rich gases are in the range −4.2 to −6.1‰, i.e. in that range normally attributed to mantle carbon, but which could also represent an average crustal composition and therefore do not discriminate between mantle and crustal sources.C/3He ratios show 4 orders of magnitude variation from 1.4 × 1012 to 5 × 108 and, compared to a mantleC/3He ratio of ∼ 109, indicate that either a complex fractionation has occurred between mantle helium and mantle CO2 or more likely that mantle rare gases have been diluted by large quantities of CO2 with an average crustal carbon isotope composition. The regional distribution of3He and C does not show any obvious relationship to age or proximity of volcanic centres or major faults, suggesting that mantle-derived C and He components decoupled from their silicate melt sources at some depth.The results from this area of active fluid circulation suggest that C-isotope data derived from metamorphic terrains should be interpreted with great caution, but that input of some mantle-derived carbon is expected to accompany crustal extension.

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DOI: 10.1016/0012-821X(87)90026-4

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<term>Noble gases</term>
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<term>Radiogenic helium</term>
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<term>Abundance patterns</term>
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<term>Carbon dioxide gases</term>
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<term>Chemical thermometry</term>
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<term>Crustal</term>
<term>Dioxide</term>
<term>Earth planet</term>
<term>Earth sciences</term>
<term>Equilibrium partition</term>
<term>Fouillac</term>
<term>Geochim cosmochim</term>
<term>Global distribution</term>
<term>Groundwaters</term>
<term>Helium isotopes</term>
<term>Higher values</term>
<term>Isotope</term>
<term>Isotope geochemistry</term>
<term>Isotopic composition</term>
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<term>Mantle carbon</term>
<term>Mantle component</term>
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<term>Molar ratios</term>
<term>Mole fractions</term>
<term>Noble gases</term>
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<term>Other tectonically</term>
<term>Pannonian basin</term>
<term>Present study</term>
<term>Puys</term>
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<term>Radiogenic helium</term>
<term>Rare gases</term>
<term>Ratio measurements</term>
<term>Recharge water</term>
<term>Regional metamorphism</term>
<term>Rhine graben</term>
<term>Ridge basalts</term>
<term>Royat ceyssat</term>
<term>Sample location</term>
<term>Samples show</term>
<term>Single fluid phase</term>
<term>Solid lines</term>
<term>Thermal waters</term>
<term>Variscan basement</term>
<term>Volcanic</term>
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<term>Volcanic fields</term>
<term>Water phases</term>
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<front><div type="abstract" xml:lang="en">Abstract: CO2-rich gases and groundwaters from springs and boreholes originating within the basement of the Massif Central have variable3He/4He ratios with correspondingR/Ra values ranging from 0.8 to 5.5 and 0.3 to 2.8 respectively, indicating the presence of a significant component of mantle helium. Molar concentrations of rare gases in the CO2-rich gases are approximately 5 orders of magnitude greater than in the waters and suggest that a near-surface Henry's Law fractionation has occurred between exsolving CO2 and water.δ13C values of the CO2-rich gases are in the range −4.2 to −6.1‰, i.e. in that range normally attributed to mantle carbon, but which could also represent an average crustal composition and therefore do not discriminate between mantle and crustal sources.C/3He ratios show 4 orders of magnitude variation from 1.4 × 1012 to 5 × 108 and, compared to a mantleC/3He ratio of ∼ 109, indicate that either a complex fractionation has occurred between mantle helium and mantle CO2 or more likely that mantle rare gases have been diluted by large quantities of CO2 with an average crustal carbon isotope composition. The regional distribution of3He and C does not show any obvious relationship to age or proximity of volcanic centres or major faults, suggesting that mantle-derived C and He components decoupled from their silicate melt sources at some depth.The results from this area of active fluid circulation suggest that C-isotope data derived from metamorphic terrains should be interpreted with great caution, but that input of some mantle-derived carbon is expected to accompany crustal extension.</div>
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Mantle-derived volatiles in continental crust: the Massif Central of France

Mantle-derived volatiles in continental crust: the Massif Central of France

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Descripteurs français

English descriptors

Abstract

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