Primitive Cretaceous island-arc volcanic rocks in eastern Cuba: the Téneme Formation
The Téneme Formation is located in the Mayarí-Cristal ophiolitic massif and represents one of the three Cretaceousvolcanic Formations established in northeastern Cuba. Téneme volcanics are cut by small bodies of 89.70± 0.50 Ma quarz-diorite rocks (Río Grande intrusive), and are overthrusted by serpe...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:50540206 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=50540206 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias de la Tierra Cuba Primitive island arc Geochemistry Volcanic rocks |
| Sumario: | The Téneme Formation is located in the Mayarí-Cristal ophiolitic massif and represents one of the three Cretaceousvolcanic Formations established in northeastern Cuba. Téneme volcanics are cut by small bodies of 89.70± 0.50 Ma quarz-diorite rocks (Río Grande intrusive), and are overthrusted by serpentinized ultramafics.Téneme volcanic rocks are mainly basalts, basaltic andesites, andesites, and minor dacites, and their geochemicalsignature varies between low-Ti island arc tholeiites (IAT) with boninitic affinity (TiO2 < 0.4 %; high fieldstrength elements << N-type MORB) and typical oceanic arc tholeiites (TiO2 = 0.5-0.8 %). Basaltic rocksexhibit low light REE/Yb ratios (La/Yb < 5), typical of intraoceanic arcs and are comparable to Maimón Formationin Dominican Republic (IAT, pre Albian) and Puerto Rican lavas of volcanic phase I (island arc tholeiites,Aptian to Early Albian). The mantle wedge signature of the Téneme Formation indicates a highly depletedMORB-type mantle source, without any contribution of E-MORB or OIB components. Our results suggest thatTéneme volcanism represents a primitive oceanic island arc environment. If the Late Cretaceous age (Turonianor early Coniacian) proposed for Téneme Formation is correct, our results indicate that the Cretaceous volcanicrocks of eastern Cuba and the Dominican Republic are not segments of a single arc system, and that in LateCretaceous (Albian-Campanian) Caribbean island arc development is not represented only by calc-alkaline(CA) volcanic rocks as has been suggested in previous works. |
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