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<title lang=en>Geochemistry of Cretaceous magmatism in eastern Cuba: Recycling of North American continental sediments and implications for subduction polarity in the Greater Antilles paleo-arc</title>
<creator>Marchesi, C.</creator>
<creator>Garrido, C. J.</creator>
<creator>Bosch, Delphine</creator>
<creator>Proenza, J. A.</creator>
<creator>Gervilla, F.</creator>
<creator>Monie, Patrick</creator>
<creator>Rodriguez-Vega, A.</creator>
<contributor>Departamento De Mineralogía Y Petrología, Facultad De Ciencias, Universidad De Granada ; Université du Québec</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Departament De Cristal·lografia, Mineralogia I Dipòsits Minerals, Facultat De Geologia, Universitat De Barcelona ; Université du Québec</contributor>
<contributor>Departamento De Geología, Instituto Superior Minero-Metalúrgico, 83320 Moa, Holguín ; Université du Québec</contributor>
<source>ISSN: 0022-3530</source>
<source>EISSN: 1460-2415</source>
<source>Journal of Petrology</source>
<publisher>Oxford University Press (OUP)</publisher>
<identifier>hal-00406373</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00406373</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00406373</source>
<source>Journal of Petrology, Oxford University Press (OUP), 2007, 48 (9), pp.1813-1840. 〈10.1093/petrology/egm040〉</source>
<identifier>DOI : 10.1093/petrology/egm040</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egm040</relation>
<language>en</language>
<subject lang=en>eastern Cuba</subject>
<subject lang=en>Greater Antilles paleo-island arc</subject>
<subject lang=en>mantle source depletion</subject>
<subject lang=en>Nb/Ta fractionation</subject>
<subject lang=en>slab component</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We present whole-rock major- and trace-element and Nd–Sr–Pb radiogenic isotope data for Cretaceous igneous suites from eastern Cuba. These rocks are related to the Greater Antilles paleo-island arc magmatism and have three different igneous styles. Group 1 consists of tholeiitic basalts and rare basaltic andesites that have normal mid-ocean ridge basalt (N-MORB)-like compositions similar to those found in back-arc basin basalts (TiO2 = 1·2–2·9 wt%; La/Yb(N) = 0·7–0·9, Th/Nb = 0·06–0·08, and initial 208Pb/ 204Pb = 37·65–37·74). Group 2 comprises basaltic and rare basaltic andesitic subvolcanic dykes with major- and trace-element and isotopic compositions similar to those of island arc tholeiites (TiO2 = 0·7–1·4 wt%; La/Yb(N) = 0·6–0·9, Th/Nb = 0·06–0·68, and initial 208Pb/ 204Pb = 37·74–38·25). Group 3 is composed of low-Ti (TiO2 = 0·3–0·9 wt%) calcalkaline igneous rocks that have an unambiguous subduction-related character (La/Yb(N) = 1·1–5·0, Th/Nb = 0·35–1·55, and initial 208Pb/ 204Pb = 37·94–38·39). The parental magmas of the three groups formed by variable melting degrees (< 5–25%) of spinel lherzolite, with more depleted mantle sources for Groups 2 and 3 than Group 1. The trace-element and radiogenic isotope compositions of primitive Group 3 samples are strongly bimodal. One subgroup of samples is characterized by low Ta/Yb (0·02–0·03) and Th/La (0·10–0·13), slightly subchondritic Nb/Ta (13·3–17·3), and relatively high initial 206Pb/204Pb (18·57–18·62) and {varepsilon}Nd (7·6–9·4). The remaining primitive Group 3 samples have higher Ta/Yb (0·06–0·11) and Th/La (0·24–0·32), and highly subchondritic Nb/Ta (7·6–9·1), coupled with lower initial 206Pb/204Pb (18·24–18·29) and {varepsilon}Nd (3·4–5·5). These signatures were induced by two distinct slab components that mainly reflect the contributions of Cretaceous Atlantic marine and North American continental sediments, respectively. Nb/Ta in the first subgroup was influenced by melting of rutile-bearing subducted crust, whereas in the second it was inherited from recycled continental sediments. The involvement of Atlantic and North American sediments in Cuban Cretaceous magmatism indicates that the Proto-Caribbean (North American-Proto Atlantic) lithosphere subducted beneath the Greater Antilles arc during the Late Cretaceous (pre-Campanian), consistent with geotectonic models involving onset of SW-dipping subduction beneath the Greater Antilles paleo-arc during the Aptian. The variable mantle source depletion and magnitude of the subduction component probably reflect different settings across the arc, from the arc front to a back-arc spreading ridge.</description>
<date>2007</date>
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