Geochemistry and early Palaeogene SHRIMP zircon ages for island arc granitoids of the Sierra Maestra, southeastern Cuba |
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Authors: | Y Rojas-Agramonte F Neubauer YS Wan DE Garcia-Delgado |
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Institution: | a Institut für Geologie und Paläontologie, Universität Salzburg, Hellbrunner Str. 34, A-5020 Salzburg, Austria b Instituto de Geología y Paleontología, Via Blanca y Linea del Ferrocarril, San Miguel del Padrón. CP 11 000, Ciudad Habana, Cuba c Institut für Geowissenschaften, Universität Mainz, 55099 Mainz, Germany d Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100097, PR China |
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Abstract: | The Palaeogene volcanic arc successions of the Sierra Maestra, southeastern Cuba, were intruded by calc-alkaline, low- to medium-K tonalites and trondhjemites during the final stages of subduction and subsequent collision of the Caribbean oceanic plate with the North American continental plate. U-Pb SHRIMP zircon dating of five granitoids yielded 206Pb/238U emplacement ages between 60.5±2.2 and 48.3±0.5 Ma. The granitoids are the result of subduction-related magmatism and have geochemical characteristics similar to those of magmas from intra-oceanic island-arcs such as the Izu Bonin-Mariana arc and the New Britain island arc, Lesser Antilles. Major and trace element patterns suggest evolution of these rocks from a single magmatic source. Geochemical features characterize these rocks as typical subduction-related granitoids as found worldwide in intra-oceanic arcs, and they probably formed through fractional crystallization of mantle-derived low- to medium-K basalt. |
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Keywords: | Calc-alkaline granitoids Cuba Sierra Maestra Subduction magmatism Zircon geochronology |
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