The basaltic volcanism of the Dumisseau Formation in the Sierra de Bahoruco, SW Dominican Republic: a record of the mantle plume magmatism of the Caribbean Large Igneous Province
DOI:
https://doi.org/10.21701/bolgeomin.128.3.002Keywords:
basalts, Dumisseau Formation, mantle plume magmatism, Caribbean large igneous provinceAbstract
The Dumisseau Formation outcropping in the Sierra de Bahoruco offers the opportunity for studying on land the mantle plume magmatism generator of the Caribbean Large Igneous Province (CLIP) during the Late Cretaceous. It consists of a sequence of about 1.0-1.5 km-thick mainly composed of mafic basaltic flows and pyroclastic deposits, with subordinated volcanogenic sedimentary deposits and syn-volcanic doleritic sills and dikes. All the volcanic rocks were erupted or re-sedimented in relatively deep-marine conditions, as evidenced by the rare interbedded chert and pelagic limestone. On the basis of the MgO, TiO2 and incompatible trace elements contents three geochemical groups have been identified in the Dumisseau Formation: low-Ti tholeiites; high-Ti or transitional basalts; and high-Ti and LREE alkaline basalts. Geochemical modelling indicates a derivation from melts generated and incorporated at different depths in the mantle, which is consistent with the processes that take place during the rise of a mantle plume beneath the oceanic crust. Two 40Ar/39Ar whole-rock ages indicate the extrusion of magmas at least in the 92-74 Ma time interval (Turonian-Coniacian boundary to Maastrichtian), resulting coeval with the formation of the CLIP. As a result, the Dumisseau Formation is an emerged fragment of the CLIP, with which it must have continuity through the Beata Ridge. These rocks are unconformably overlain by carbonate red algae facies of the middle-upper Eocene, constituting the volcanic basement of the Sierra de Bahoruco.
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