Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction
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 v...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-11-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987120301237 |
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| author | Júlia Farré-de-Pablo Joaquín A. Proenza José María González-Jiménez Thomas Aiglsperger Antonio Garcia-Casco Javier Escuder-Viruete Vanessa Colás Francisco Longo |
| author_facet | Júlia Farré-de-Pablo Joaquín A. Proenza José María González-Jiménez Thomas Aiglsperger Antonio Garcia-Casco Javier Escuder-Viruete Vanessa Colás Francisco Longo |
| author_sort | Júlia Farré-de-Pablo |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T08:23:11Z |
| format | Article |
| id | doaj.art-e6cf73f87bc045b28f7ea69768ea9522 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T08:23:11Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
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| series | Geoscience Frontiers |
| spelling | doaj.art-e6cf73f87bc045b28f7ea69768ea95222023-09-02T18:18:48ZengElsevierGeoscience Frontiers1674-98712020-11-0111620832102Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interactionJúlia Farré-de-Pablo0Joaquín A. Proenza1José María González-Jiménez2Thomas Aiglsperger3Antonio Garcia-Casco4Javier Escuder-Viruete5Vanessa Colás6Francisco Longo7Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, C/ Martí i Franquès, s/n, 08028, Barcelona, Spain; Corresponding author.Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, C/ Martí i Franquès, s/n, 08028, Barcelona, SpainDepartamento de Mineraloga y Petrologa, Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002, Granada, SpainDepartment of Civil Engineering and Natural Resources, Luleå University of Technology, SE 97187, Luleå, SwedenDepartamento de Mineraloga y Petrologa, Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002, Granada, Spain; Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Avda. de las Palmeras 4, E-18100, Armilla, Granada, SpainInstituto Geológico y Minero de España, C/ La Calera 1, Tres Cantos, 28760, Madrid, SpainInstituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, Ciudad de México, MexicoFacultad de Ingeniería, Universidad Católica de Cibao, La Vega, Dominican RepublicChromitite 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.http://www.sciencedirect.com/science/article/pii/S1674987120301237ChromititeOphiolitePlumeMantleBack-arc basinDominican Republic |
| spellingShingle | Júlia Farré-de-Pablo Joaquín A. Proenza José María González-Jiménez Thomas Aiglsperger Antonio Garcia-Casco Javier Escuder-Viruete Vanessa Colás Francisco Longo Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction Geoscience Frontiers Chromitite Ophiolite Plume Mantle Back-arc basin Dominican Republic |
| title | Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction |
| title_full | Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction |
| title_fullStr | Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction |
| title_full_unstemmed | Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction |
| title_short | Ophiolite hosted chromitite formed by supra-subduction zone peridotite –plume interaction |
| title_sort | ophiolite hosted chromitite formed by supra subduction zone peridotite plume interaction |
| topic | Chromitite Ophiolite Plume Mantle Back-arc basin Dominican Republic |
| url | http://www.sciencedirect.com/science/article/pii/S1674987120301237 |
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