La geoquímica de la Formación Maimón (Cordillera Central, República Dominicana) revisada

  1. L. Torró 1
  2. J. A. Proenza 1
  3. A. García-Casco 2
  4. J. Farré de Pablo 1
  5. R. del Carpio 3
  6. P. León 3
  7. C. Chávez 3
  8. H. Domínguez 4
  9. Salvador Brower 5
  10. J. Espaillat 6
  11. C. Nelson 7
  12. J. F. Lewis 8
  1. 1 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  2. 2 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  3. 3 Corporación Minera Dominicana
  4. 4 Everton Minera Dominicana
  5. 5 Brouwer Geoconsultores
  6. 6 GoldQuest Mining Corp
  7. 7 Recursos del Caribe
  8. 8 Department of Earth and Environmental Sciences
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Zeitschrift:
Boletín geológico y minero

ISSN: 0366-0176

Datum der Publikation: 2017

Ausgabe: 128

Nummer: 3

Seiten: 517-539

Art: Artikel

DOI: 10.21701/BOLGEOMIN.128.3.001 DIALNET GOOGLE SCHOLAR

Andere Publikationen in: Boletín geológico y minero

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Zusammenfassung

Volcanic rocks from the Maimón Formation, metamorphosed under greenschist facies conditions, represent the most ancient arc magmatism recorded in the Cretaceous Caribbean island arc. From new geochemical data, and on the basis of immobile trace elements (high field strength elements - HFSE, rare earth elements - REE), a predominance of basaltic protoliths over intermediate and acid compositions have been determined. Geochemically, the basaltic protolith includes boninites, low-Ti LREE-depleted island arc tholeiites, normal low-Ti island arc tholeiites, and exiguous normal island arc tholeiites. The acid rocks present a clear boninitic and tholeiitic affinity and are of the M-type (mantle-derived). The geochemistry of low-Ti LREE-depleted island arc tholeiites permits their classification as fore-arc basalts (FAB), which is a term introduced recently to describe tholeiites with MORB (mid-ocean ridge basalt)-like features from the Izu-Bonin-Mariana fore-arc. The presence of FAB and their stratigraphic association with boninites indicate formation in a fore-arc environment during the earliest stage of island arc magmatism in an extensional setting that characterizes the onset of subduction and birth of an island arc. The Maimón Formation could represent the volcanic top of an ophiolite of the “subduction initiation” type.

Fuente de los datos: Dialnet