ParkinsonCanadaV1, France, Analysis, bibRecord, 000298

Re–Os constraints on harzburgite and lherzolite formation in the lithospheric mantle: a study of northern Canadian Cordillera xenoliths

Identifieur interne : 000298 ( France/Analysis ); précédent : 000297; suivant : 000299

Re–Os constraints on harzburgite and lherzolite formation in the lithospheric mantle: a study of northern Canadian Cordillera xenoliths

Auteurs : Anne H. Peslier [États-Unis, Canada] ; Laurie Reisberg [France] ; John Ludden [France] ; Don Francis [Canada]

Source :

Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 2000.

RBID : ISTEX:DA58324ED3EEA0C7717970E70BF44B4D6BF21954

Abstract

Osmium isotope data from lherzolite and harzburgite xenoliths of the northern Canadian Cordillera provide constraints on the genesis and age of the lithospheric mantle in a typical off-cratonic continental setting. The 187Os/188Os ratios of the lherzolites show a positive correlation with Al2O3 and heavy rare earth elements (HREE), which probably reflects Re/Os fractionation during various degrees of mantle melting, followed by a long period of radiogenic ingrowth. These observations are consistent with melting during the Proterozoic. Harzburgite Os isotopic ratios, however, plot above the regional correlation of the lherzolites. A positive correlation between their Os isotopic ratios and 1/Os concentrations suggests that they are the end result of the introduction of metasomatic agents with low Os contents, but high 187Os/188Os ratios, into the lithospheric mantle. These fluids or melts may have originated from a region of anomalously slow mantle detected seismically (Frederiksen et al., 1998) below harzburgite-rich xenolith localities (Shi et al., 1998). Alternatively, the radiogenic Os-bearing metasomatic agents may have been related to subduction processes along the western margin of the Canadian Cordillera, as has been previously suggested to explain the high Os isotopic ratios of xenoliths from the northern US Cordillera (Brandon et al., 1996a).

Url:

https://api-v5.istex.fr/document/DA58324ED3EEA0C7717970E70BF44B4D6BF21954/fulltext/pdf

DOI: 10.1016/S0016-7037(00)00391-4

Affiliations:

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ISTEX:DA58324ED3EEA0C7717970E70BF44B4D6BF21954

Le document en format XML

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	La maladie de Parkinson au Canada (serveur d'exploration)
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La maladie de Parkinson au Canada (serveur d'exploration)

Re–Os constraints on harzburgite and lherzolite formation in the lithospheric mantle: a study of northern Canadian Cordillera xenoliths

Re–Os constraints on harzburgite and lherzolite formation in the lithospheric mantle: a study of northern Canadian Cordillera xenoliths

Source :

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri