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  Meter-scale Nd isotopic heterogeneity in pyroxenite-bearing Ligurian peridotites encompasses global-scale upper mantle variability

Borghini, G., Rampone, E., Zanetti, A., Class, C., Cipriani, A., Hofmann, A. W., et al. (2013). Meter-scale Nd isotopic heterogeneity in pyroxenite-bearing Ligurian peridotites encompasses global-scale upper mantle variability. Geology, 41(10), 1055-1058.

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Borghini, G., Autor
Rampone, E., Autor
Zanetti, A., Autor
Class, C.1, Autor           
Cipriani, A., Autor
Hofmann, A. W.2, Autor           
Goldstein, S. L., Autor
Affiliations:
1External Organizations, ou_persistent22              
2Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826288              

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 Zusammenfassung: Pyroxenites embedded in peridotite are often invoked as a major cause of short-length scale isotopic heterogeneities in the upper mantle, but there has been little direct evidence. We report spatially controlled chemical and Sr-Nd isotopic compositions of pyroxenites and their host peridotites from an ophiolitic mantle sequence in the Northern Apennines, Italy, with depleted mantle compositions, representing a surface exposure of veined upper mantle, a potential source for mid-oceanic-ridge basalts (MORB). Interaction between pyroxenites and adjacent mantle rocks results in centimeter-scale chemical modifications in the host peridotites, systematically lowering their Sm/Nd ratios. Over time, this interaction causes the host peridotite at >0.1 m scale to acquire an isotopic heterogeneity larger than the range defined by the peridotite and pyroxenite end-members. Moreover, the Nd-143/Nd-144 variation of a single outcrop covers most of the global Nd isotopic variability documented in abyssal peridotites. Such pyroxenite-peridotite veined mantle domains may represent the enriched component rarely found in abyssal peridotites, but often invoked to account for the low end of Nd-143/Nd-144 variations in MORB.

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Sprache(n): eng - English
 Datum: 2013-10
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Interne Begutachtung
 Identifikatoren: eDoc: 675658
ISI: 000327391200004
 Art des Abschluß: -

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Titel: Geology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 41 (10) Artikelnummer: - Start- / Endseite: 1055 - 1058 Identifikator: ISSN: 0091-7613