COMPLEMENTARY TI AND ZR ANOMALIES IN ORTHO-PYROXENE AND CLINOPYROXENE FROM MANTLE PERIDOTITES (Articolo in rivista)

Type
Label
  • COMPLEMENTARY TI AND ZR ANOMALIES IN ORTHO-PYROXENE AND CLINOPYROXENE FROM MANTLE PERIDOTITES (Articolo in rivista) (literal)
Anno
  • 1991-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/354518a0 (literal)
Alternative label
  • RAMPONE E. 1,2; BOTTAZZI P. 3; OTTOLINI L. 3; (1991)
    COMPLEMENTARY TI AND ZR ANOMALIES IN ORTHO-PYROXENE AND CLINOPYROXENE FROM MANTLE PERIDOTITES
    in Nature (Lond.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • RAMPONE E. 1,2; BOTTAZZI P. 3; OTTOLINI L. 3; (literal)
Pagina inizio
  • 518 (literal)
Pagina fine
  • 520 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 354 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 6354 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Dipartimento di Scienze della Terra, Università di Genova, Corso Europa 30, I-16132 Genova, Italy; 2 Max-Planck-Institut für Chemie, Saarstrasse 23, Mainz, Germany; 3 CNR Centro di Studio per la Cristallochimica e la Cristallografia, via Bassi 4, I-27100 Pavia, Italy; (literal)
Titolo
  • COMPLEMENTARY TI AND ZR ANOMALIES IN ORTHO-PYROXENE AND CLINOPYROXENE FROM MANTLE PERIDOTITES (literal)
Abstract
  • FROM the observation that clinopyroxenes in lherzolites from sub-arc, sub-continental and sub-oceanic lithosphere are depleted in titanium and zirconium Salters and Shimizu 1 inferred the existence of a worldwide layer in the upper mantle depleted in these 'high-field-strength' elements. This seems inconsistent, however, with the fact that basalts generated in the upper mantle, except in certain restricted environments (related to subduction processes), do not show depletion of these elements. In an attempt to address this conflict, we have used ion-probe measurements to study Ti and Zr abundances in sub-continental spinel peridotites from Liguria, Italy. We confirm the existence of Ti and Zr depletion in clinopyroxenes, but find that these are compensated by enrichment in the coexisting orthopyroxene. The calculated whole-rock abundance patterns therefore show negligible anomalies. We conclude that Ti, Zr and rare-earth abundances in clinopyroxene alone cannot be used to infer the existence of a global mantle layer depleted in high-field-strength elements, a feature that would place important constraints on models of lithospheric growth 2. (literal)
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