POSSIBLE DIFFUSIVE FRACTIONATION OF HELIUM ISOTOPES IN OLIVINE AND CLINOPYROXENE PHENOCRYSTS
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dc.contributor.author | Harrison D. | |
dc.contributor.author | Barry T. | |
dc.contributor.author | Turner G. | |
dc.date.accessioned | 2022-04-08T06:42:00Z | |
dc.date.available | 2022-04-08T06:42:00Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13925338 | |
dc.identifier.citation | European Journal of Mineralogy, 2004, 16, 2, 213-220 | |
dc.identifier.issn | 0935-1221 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36917 | |
dc.description.abstract | New helium isotope data (He-3/He-4) from a series of co-genetic Siberian lavas of Cenozoic age (0.6 - 3 Ma) provide possible evidence for mass-dependent helium isotope fractionation. These lavas, erupted around the Baikal rift, have sampled subcontinental lithospheric mantle (SCLM). He-3/He-4 ratios measured in clinopyroxene and olivine phenocrysts are between 0.9 - 8.3 R-a. The SCLM in this region is therefore characterised by the higher unmodified He-3/He-4 ratios, which are similar to the source region of mid-ocean ridge basalts (MORB). Helium isotope variation of this scale and order within local regional volcanic settings has previously been ascribed to purely, crustal contamination or radiogenic ingrowth of He-4. However, we argue that helium isotopes may also be affected by mass-dependent fractionation. This can occur during helium diffusion from the phenocrysts within subsolidus magmas. | |
dc.title | POSSIBLE DIFFUSIVE FRACTIONATION OF HELIUM ISOTOPES IN OLIVINE AND CLINOPYROXENE PHENOCRYSTS | |
dc.type | Статья |
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