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Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction
Departament de Mineralogia, Petrologia I Geologia Aplicada, Universitat de Barcelona, Barcelona, Spain.
Departament de Mineralogia, Petrologia I Geologia Aplicada, Universitat de Barcelona, Barcelona, Spain.
Departamento de Mineralogía y Petrología, Universidad de Granada, Facultad de Ciencias, Granada, Spain.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-1298-0320
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2020 (English)In: Geoscience Frontiers, ISSN 1674-9871Article in journal (Refereed) In press
Abstract [en]

Chromitite bodies hosted in peridotites typical of suboceanic mantle (s.l. ophiolitic) are found in the northern and central part of the Loma Caribe Peridotite in the Cordillera Central of the Dominican Republic. These chromitites are massive pods of small size (less than a few meters across) and veins that intrude both dunite and harzburgite. Compositionally, they are high-Cr chromitites [Cr# = Cr/(Cr+Al) atomic ratio = 0.71–0.83] singularly enriched in TiO2 (up to 1.25 wt.%), Fe2O3 (2.77–9.16 wt.%) as well as some trace elements (Ga, V, Co, Mn, and Zn) and PGE (up to 4548 ppb in whole-rock). This geochemical signature is unknown for chromitites hosted in oceanic upper mantle but akin to those chromites crystallized from mantle plume derived melts. Noteworthy, the melt estimated to be in equilibrium with such chromite from the Loma Caribe chromitites is similar to basalts derived from different source regions of a heterogeneous Caribbean mantle plume. This mantle plume is responsible for the formation of the Caribbean Large Igneous Province (CLIP). Dolerite dykes with back-arc basin basalt (BABB) and enriched mid-ocean ridge basalt (E-MORB) affinities commonly intrude the Loma Caribe Peridotite, and are interpreted as evidence of the impact that the Caribbean plume had in the off-axis magmatism of the back-arc basin, developed after the Caribbean island-arc extension in the Late Cretaceous. We propose a model in which chromitites were formed in the shallow portion of the back-arc mantle as a result of the metasomatic reaction between the supra-subduction zone (SSZ) peridotites and upwelling plume-related melts.

Place, publisher, year, edition, pages
Elsevier, 2020.
Keywords [en]
Chromitite, Ophiolite, Plume, Mantle, Back-arc basin, Dominican Republic
National Category
Geology Geochemistry
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-78960DOI: 10.1016/j.gsf.2020.05.005OAI: oai:DiVA.org:ltu-78960DiVA, id: diva2:1431404
Available from: 2020-05-20 Created: 2020-05-20 Last updated: 2020-05-27

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Aiglsperger, Thomas

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