OS ISOTOPES IN OROGENIC LHERZOLITE MASSIFS AND MANTLE HETEROGENEITIES
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dc.contributor.author | Roy-Barman M. | |
dc.contributor.author | Luck J.M. | |
dc.contributor.author | Allegre C.J. | |
dc.date.accessioned | 2020-11-20T10:52:42Z | |
dc.date.available | 2020-11-20T10:52:42Z | |
dc.date.issued | 1996 | |
dc.identifier | https://elibrary.ru/item.asp?id=431513 | |
dc.identifier.citation | Chemical Geology, 1996, , 1, 55-64 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19158 | |
dc.description.abstract | The study of 187 Re-187OS systematics in the orogenic lherzolite bodies of Baldissero, Beni Bousera, Lanzo and Lherz shows the extreme isotopic heterogeneity of these massifs. Peridotites have 187Os/186Os ratios that cluster around the primitive mantle value (1.05–1.06) while pyroxenites have extremely radiogenic 187Os/186Os ratios (from 1.78 to 8.9). The isotopic variations recorded by a single pyroxenite demonstrate that osmium is heterogeneously distributed on a very small scale. The 187Os/1s6Os ratios of peridotites are comparable to those measured on abyssal peridotites, which suggests that they represent a MORB source type of mantle. The radiogenic 187Os/ 1860s ratios of pyroxenites suggest that they are melts or cumulates formed ∼ 1 Ga ago and that they may represent old delaminated oceanic crust. The preferential melting of pyroxenites during the formation of oceanic basalts may account for some of the radiogenic 187Os/ 186Os ratios encountered in MORBs and OIBs. | |
dc.title | OS ISOTOPES IN OROGENIC LHERZOLITE MASSIFS AND MANTLE HETEROGENEITIES | |
dc.type | Статья |
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