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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universitat de Barcelona
2006
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| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=50540205 |
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- Tectonic implications of paleontologic dating of Cretaceous-Danian sections of Eastern Cuba M.A. Iturralde-Vinent C. Díaz-Otero A. Rodríguez-Vega R. Díaz-Martínez Ciencias de la Tierra Tectonic Paleocene Caribbean Cretaceous Stratigraphy The sedimentary rocks intercalated in volcanic and metavolcanic sections of Mayarí-Baracoa and Sierra delPurial Mountains (Eastern Cuba), yielded Cretaceous through Danian microfossils. In the Mayarí Mountains theTéneme Fm consists of basalts and hyaloclastites with minor intercalations of well-bedded foliated limestoneand shaly limestone that in the type area contain a Turonian or early Coniacian planktonic foraminifera assemblage.In the Morel area (Moa-Baracoa massif), back-arc pillow basalts with ribbon cherts include a late Turonianor Coniacian limestone bed intercalated with interbedded organic-rich calcareous shales near the top. Theupper part of the Coniacian (?)-Campanian Santo Domingo Fm crops out west of Moa and it consists of finegrainedwell-bedded volcaniclastic rocks with two intercalated lenses of coarse-grained impure biocalciruditesto biocalcarenites. These rocks yielded a mixed penecontemporaneous planktonic and benthonic microfossilassemblage attributed to the lower part of the late Campanian (Globotruncanita calcarata Zone). At Sierra delPurial, crystalline limestones embedded within the metavulcano-sedimentary Río Baracoa section (Purial metamorphiccomplex) yielded Campanian microfossils. The Maastrichtian Yaguaneque (=Cañas) limestones cropout extensively in both Mayarí-Baracoa and Purial Mountains. All the formations previously mentioned unconformablyoverlie and tectonically intermingle with the late Maastrichtian-early Danian clastic rocks of theMícara and La Picota Fms. Our new dates demonstrate that in the Greater Antilles the PIA (Primitive IslandArctholeiite) recorded by the Téneme Fm would be Late Cretaceous in age in opposition to the Lower Cretaceousage proposed for the PIA basalts. The protolith of the Purial metamorphic complex is probably Maastrichtian-early Danian, but certainly Campanian and older in age. This fact suggests that the metamorphism thataffected the Purial rocks took place probably in the late Maastrichtian and was coeval with the detachment,exhumation and emplacement of mafic-ultramafic thrust-sheet bodies. This event recorded in EasternCuba/Western Hispaniola and Guatemala might have been related to the insertion of thick oceanic ridges intothe subduction zone. 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540205 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1-2 Vol.4