Equivocal carbonatite markers in the mantle xenoliths of the Patagonia backarc: the Gobernador Gregores case (Santa Cruz Province, Argentina). (Articolo in rivista)

Type
Label
  • Equivocal carbonatite markers in the mantle xenoliths of the Patagonia backarc: the Gobernador Gregores case (Santa Cruz Province, Argentina). (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00410-004-0582-2 (literal)
Alternative label
  • Rivalenti G.; Zanetti A.; Mazzucchelli M.; Vannucci R.; Cingolani C.A. (2004)
    Equivocal carbonatite markers in the mantle xenoliths of the Patagonia backarc: the Gobernador Gregores case (Santa Cruz Province, Argentina).
    in Contributions to mineralogy and petrology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Rivalenti G.; Zanetti A.; Mazzucchelli M.; Vannucci R.; Cingolani C.A. (literal)
Pagina inizio
  • 647 (literal)
Pagina fine
  • 670 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 147 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Rivalenti G. a; Zanetti A. b; Mazzucchelli M. a; Vannucci R. b,c; Cingolani C.A. d: a Dipartimento di Scienze della Terra, Università degli Studi di Modena e Reggio Emilia, 41110 Modena, Italy; b Istituto di Geoscienze e Georisorse-CNR, Sezione di Pavia, 27100 Pavia, Italy; c Dipartimento di Scienze della Terra, Università degli Studi di Pavia, 27100 Pavia, Italy; d Centro de Investigaciones Geologicas, Universidad Nacional de La Plata, 1900 La Plata, Argentina (literal)
Titolo
  • Equivocal carbonatite markers in the mantle xenoliths of the Patagonia backarc: the Gobernador Gregores case (Santa Cruz Province, Argentina). (literal)
Abstract
  • Amphibole ± phlogopite ± apatite-bearing mantle xenoliths at Gobernador Gregores display modal, bulk-rock and phase geochemical characteristics held as indicators of carbonatitic metasomatism. However, part of these xenoliths has high TiO2/Al2O3 and those displaying the most pronounced carbonatitic geochemical markers modally trend towards harzburgite. Bulk-rock, clinopyroxene and amphibole show Zr, Hf and Ti negative anomalies, which increase at decreasing Na2O and high field strength elements (HFSE) concentrations. Steady variation trends between xenoliths which have and do not have carbonatitic characteristics suggest a control by reactive porous flow of only one agent, inferred to be initially a ne-normative hydrous basalt (because of the presence of wehrlites) evolving towards silica saturation. Variation trends exhibit cusps when amphibole appears in the mode. Appearance of amphibole may explain the Ti anomaly variations, but not those of Zr and Hf. Numerical modelling [Plate Model (Vernières et al. in J Geophys Res 102:24771–24784, 1997)] gives results consistent with the observed geochemical features by assuming the presence of loveringite. Modest HFSE anomalies in the infiltrating melt may be acquired during percolation in the garnet-facies. (literal)
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