Late Jurassic Oceanic Crust and Upper Cretaceous Caribbean Plateau Picritic Basalts Exposed in the Duarte Igneous Complex, Hispaniola - Archive ouverte HAL Access content directly
Journal Articles Journal of Geology Year : 1999

Late Jurassic Oceanic Crust and Upper Cretaceous Caribbean Plateau Picritic Basalts Exposed in the Duarte Igneous Complex, Hispaniola

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Henriette Lapierre
  • Function : Author
  • PersonId : 1196870
Vincent Dupuis
  • Function : Author
Bernard Mercier de Lépinay
Marc Tardy
  • Function : Author
  • PersonId : 835194
René C. Maury
  • Function : Author
  • PersonId : 863654
Delphine Yeghicheyan
Joseph Cotten
  • Function : Author
  • PersonId : 831066

Abstract

Four distinct rock units have been recognized near El Aguacate, in the Janico–Juncalito–La Vega area of the Duarte complex (Dominican Republic): (1) serpentinites crosscut by numerous diabasic dikes, (2) basalts interbedded with Late Jurassic ribbon cherts, (3) picrites and ankaramites relatively enriched in incompatible trace elements, and (4) amphibolites and gneissic amphibolites chemically similar to Oceanic Plateau Basalts. Similar Ar-Ar ages of late magmatic amphibole from a picrite, and hornblende from an amphibolite ( (86.1 ± 1.3 Ma and 86.7 ± 1.6 Ma respectively), suggest that the Duarte picrites are contemporaneous with the Deep Sea Drilling Program Leg 15 and Ocean Drilling Program Leg 126 basalts drilled from the Caribbean oceanic plateau. These basalts are associated with sediments containing Late Cretaceous faunas. Sr, Nd, and Pb data show that enriched picrites and amphibolites are isotopically similar to mafic lavas from previously described Caribbean plateau and Gala´pagos hotspot basalts. Major element, trace element, and lead isotopic features of Late Jurassic basalts and diabases are consistent with those of normal oceanic crust basalt. However, these basalts differ from typical N-MORB because they have lower eNd ratios that plot within the range of Ocean Island Basalts. These rocks appear to represent remnants of the Caribbean Jurassic oceanic crust formed from an oceanic ridge possibly close to a hotspot. Later, they were tectonically juxtaposed with Late Cretaceous slices of the Caribbean-Colombian plateau.
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Origin : Publication funded by an institution

Dates and versions

hal-03879622 , version 1 (30-11-2022)

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Attribution - NoDerivatives - CC BY 4.0

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  • HAL Id : hal-03879622 , version 1

Cite

Henriette Lapierre, Vincent Dupuis, Bernard Mercier de Lépinay, Delphine Bosch, Patrick Monié, et al.. Late Jurassic Oceanic Crust and Upper Cretaceous Caribbean Plateau Picritic Basalts Exposed in the Duarte Igneous Complex, Hispaniola. Journal of Geology, 1999, 107, pp.193-207. ⟨hal-03879622⟩
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