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Element Transfer and Redox Conditions in Continental Subduction Zones: New Insights from Peridotites of the Ulten Zone, North Italy

Gudelius, Dominik; Aulbach, Sonja; Braga, Roberto; Höfer, Heidi E.; Woodland, Alan B.; Gerdes, Axel

Abstract:
The orogenic peridotites and pyroxenites of the Ulten Zone (north Italy) record multistage metasomatism by crust-derived melts and fluids within a Late-Variscan mantle wedge. We acquired new major and trace element data as well as garnet and whole-rock iron speciation for a representative suite of samples, with the aim to further constrain element cycling and the redox state attending the development of the major mineralogical and textural rock types that occur within the Ulten Zone. Initially, spinel peridotites were refertilized by mafic melts in the hot and shallow mantle wedge, followed by garnet formation as the peridotites were carried towards a cool, subducting slab of continental crust by corner flow. Upon exhumation, ingress of aqueous, crust-derived fluids provoked amphibole-forming reactions, which caused gradual consumption of garnet and clinopyroxene and transformation from coarse- to fine-grained assemblages. Since Si, Al, Na, Ti, Ca and HREE formerly stored in reactants were not fully accommodated in newly-formed phases, these elements were partially removed from the bulk-rock, generating more depleted compositions resembling residues after partial melting. ... mehr



Originalveröffentlichung
DOI: 10.1093/petrology/egy112
Scopus
Zitationen: 7
Web of Science
Zitationen: 4
Dimensions
Zitationen: 7
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2019
Sprache Englisch
Identifikator ISSN: 0022-3530, 1460-2415
KITopen-ID: 1000097165
Erschienen in Journal of petrology
Verlag Oxford University Press (OUP)
Band 60
Heft 2
Seiten 231–268
Vorab online veröffentlicht am 19.12.2018
Nachgewiesen in Web of Science
Dimensions
Scopus
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