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DC Field | Value | Language |
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dc.contributor.author | Pujol Solà, Núria | - |
dc.contributor.author | Proenza Fernández, Joaquín Antonio | - |
dc.contributor.author | García Casco, Antonio | - |
dc.contributor.author | González Jiménez, José María | - |
dc.contributor.author | Roman-Alpiste, Manuel Jesús | - |
dc.contributor.author | Garrido, C. J. | - |
dc.contributor.author | Melgarejo i Draper, Joan-Carles | - |
dc.contributor.author | Gervilla Linares, Fernando | - |
dc.contributor.author | Llovet Ximenes, Xavier | - |
dc.date.accessioned | 2020-05-30T09:16:48Z | - |
dc.date.available | 2022-02-12T06:10:17Z | - |
dc.date.issued | 2020-02-12 | - |
dc.identifier.issn | 0024-4937 | - |
dc.identifier.uri | http://hdl.handle.net/2445/163257 | - |
dc.description.abstract | Ti-rich amphibole, Mg-rich ilmenite, baddeleyite, zirconolite, srilankite, and zircon are important high-field-strength elements (HFSE) bearing phases in the Potosí chromitite bodies located in the Moho Transition Zone of the Cretaceous Moa-Baracoa suprasubduction zone ophiolite (eastern Cuba). Such HFSE-bearing phases were found in the interaction zone between gabbroic intrusions and chromitite pods. In addition to HFSE-bearing minerals, the studied samples are composed of Fe3+ and Ti-rich chromite, olivine (Fo86-90), clinopyroxene (En44-49), plagioclase (An51-56), orthopyroxene (En84-94), F-rich apatite, and Fe-Cu-Ni sulfides. The studied ilmenite hosting Zr oxides (baddeleyite, zirconolite, and srilankite) contains up to 13 wt.% MgO. The Potosí zirconolite is the first record of this mineral in ophiolitic chromitites and non-metamorphic ophiolite units, and it has relatively high REE contents (up to 10 wt.% of REE2O3) and the highest concentrations in Y2O3 (up to 11 wt.%) reported so far in zirconolite from terrestrial occurrences. Zircon is observed forming coronas surrounding ilmenite grains in contact with silicate minerals, and is characterized by very low U and Pb contents. The zircons formed after high temperature Zr diffusion in ilmenite (exsolution) and a subsequent reaction along grain boundaries following crystallization. Finally, U-Pb dating of baddeleyite exsolutions within ilmenite yielded an average age of 134.4 ± 14 Ma, which provides the first ever dating for a metasomatic event in Potosí that matches well (within uncertainty) the formation age of the oceanic crust of the eastern Cuba ophiolite. We propose that the occurrence of HFSE- and REE-bearing minerals in the Potosí chromite deposit is the result of a two stage process: first, water-rich and HFSE-rich residual melts are produced by intercumulus crystal fractionation after an evolved MORB (BABB)-like melt; and secondly, these residual melt fractions escaped the solidifying mush and extensively reacted and metasomatized the surrounding chromitites, crystallizing HFSE- and REE-bearing minerals and Fe-Cu-Ni sulfides. | - |
dc.format.extent | 20 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1016/j.lithos.2020.105420 | - |
dc.relation.ispartof | Lithos, 2020, vol. 358-359, p. 105420 | - |
dc.relation.uri | https://doi.org/10.1016/j.lithos.2020.105420 | - |
dc.rights | cc-by-nc-nd (c) Elsevier B.V., 2020 | - |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es | - |
dc.source | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) | - |
dc.subject.classification | Geologia submarina | - |
dc.subject.classification | Cuba | - |
dc.subject.classification | Roques ígnies | - |
dc.subject.other | Submarine geology | - |
dc.subject.other | Cuba | - |
dc.subject.other | Igneous rocks | - |
dc.title | Fe-Ti-Zr metasomatism in the oceanic mantle due to extreme differentiation of tholeiitic melts (Moa-Baracoa ophiolite, Cuba) | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 699563 | - |
dc.date.updated | 2020-05-30T09:16:48Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
Files in This Item:
File | Description | Size | Format | |
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699563.pdf | 7.44 MB | Adobe PDF | View/Open |
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