%0 Journal Article %T Plume mantle source heterogeneity through time: Insights from the Duarte Complex, Hispaniola, northeastern Caribbean %+ Instituto Geológico y Minero de España [Granada] %+ Institut de Ciències de la Terra Jaume Almera %+ INYPSA Informes y Proyectos S.A. %+ Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) %+ Pacific Centre for Isotopic and Geochemical Research %+ Dipartimento di Georisorse e Territorio %A Escuder-Viruete, Javier %A Pérez-Estaún, Andrés %A Contreras, Fernando %A Joubert, Marc %A Weis, Dominique %A Ullrich, Thomas %A Spadea, Piera %< avec comité de lecture %@ 0148-0227 %J Journal of Geophysical Research %I American Geophysical Union %V 112 %N B4 %8 2007-04-11 %D 2007 %R 10.1029/2006jb004323 %Z Sciences of the Universe [physics]/Earth SciencesJournal articles %X Located in the Cordillera Central of Hispaniola, the Duarte Complex offers an opportunity to study an on-land fragment of the Caribbean-Colombian oceanic plateau. Geochemical, Sr-Nd isotope, and 40 Ar-39 Ar radiometric age data combined with detailed mapping have shown that the Duarte Complex includes two lithostratigraphic units, composed of four geochemical groups of metavolcanic rocks: Group Ia, low-Ti high-Mg basalts, and group Ib, high-Ti picrites and primitive high-Mg basalts, occur interlayered in the lowermost levels of the lower unit; group II, light rare earth element (LREE)-enriched picrites, ferropicrites and high-Mg basalts, forms the main lava sequence of the lower unit; and group III, LREE-enriched Fe-Ti basalts, is present exclusively in the upper unit. Nd isotope and incompatible trace element patterns are diverse in the Duarte Complex metavolcanics and are consistent with mantle sources related to a heterogeneous plume. Mantle melt modeling suggests that an early, extensive melting (10-20%) of shallow mantle resulted in the formation of relatively depleted group I and II magmas, whereas the late, more enriched group III magmas were the product of deeper, low-degree (<3%) melting of a heterogeneous plume. Therefore plume mantle sources were more enriched and deeper through time. Foliated amphibolites of the Duarte Complex yield 40 Ar-39 Ar hornblende plateau ages of 93.9 ± 1.4 and 95.8 ± 1.9 Ma (Cenomanian, 99.6-93.5 Ma) that demonstrate an older age of the protholiths, probably Albian (>96 Ma). Hence an Early Cretaceous phase of the Caribbean-Colombian oceanic plateau construction is recorded in Hispaniola. %G English %2 https://brgm.hal.science/hal-03645465/document %2 https://brgm.hal.science/hal-03645465/file/Journal%20of%20Geophysical%20Research%20%20Solid%20Earth%20-%202007%20-%20Escuder%E2%80%90Viruete%20-%20Plume%20mantle%20source%20heterogeneity%20through%20time%20.pdf %L hal-03645465 %U https://brgm.hal.science/hal-03645465 %~ BRGM