The Pelona-Pico Duarte basalts Formation, Central Hispaniola: an on-land section of Late Cretaceous volcanism related to the Caribbean large igneous province

Located in Central Hispaniola, the Pelona-Pico Duarte basalts Formation (Fm.) offers an opportunity to study the Late Cretaceous Caribbean large igneous province magmatism on land. It is composed by a ~2.5km-thick pile of massive and monotonous submarine flows of basalts, locally intruded by synvolc...

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Bibliographic Details
Published in:Acta geologica hispanica 2011, Vol.9 (3-4), p.307
Main Authors: Escuder Viruete, Javier, Pérez-Estaun, Andrés, Joubert, M., Weis, D.
Format: Article
Language:English
Subjects:
Basalt
Carbonates
Caribbean large igneous province
Caribbean plate
Cretaceous
Dikes
Earth Sciences
Fractionation
Hispaniola
Island arcs
Mantle source
Rare earth elements
Sciences of the Universe
Titanium dioxide
Trace elements
Upwelling
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Summary:Located in Central Hispaniola, the Pelona-Pico Duarte basalts Formation (Fm.) offers an opportunity to study the Late Cretaceous Caribbean large igneous province magmatism on land. It is composed by a ~2.5km-thick pile of massive and monotonous submarine flows of basalts, locally intruded by synvolcanic dikes and sills of dolerite. The Pelona-Pico Duarte basalts Fm. was emplaced onto Turonian-Lower Campanian island-arc volcanic and sedimentary sequences, and is overlain by Maastrichtian platformal carbonates. Two 40Ar/39Ar plateau ages indicate both extrusive and intrusive magmatic activity at least during the 79-68Ma interval (Middle Campanian to Maastrichtian), so the magmas were in part coeval with the late phases of the Caribbean large igneous province. The basalts have a restricted major-and trace-element, and isotopic, compositional variation. For a range of 47.6- 50.2wt.% SiO2, the Pelona-Pico Duarte basalts Fm. has relatively high contents in TiO2 (1.5-3.6wt.%) and Fe2O3T (10.7-13.1wt.%). On the basis of MgO contents, samples can be classified into tholeiitic basalts (
ISSN:1695-6133
0567-7505
1696-5728
DOI:10.1344/105.000001716