Geology, age and tectonic evolution of the Sierra Maestra Mountains, southeastern Cuba
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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2006
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| author | Y. Rojas-Agramonte |
| author_facet | Y. Rojas-Agramonte |
| contents | Geology, age and tectonic evolution of the Sierra Maestra Mountains, southeastern Cuba Y. Rojas-Agramonte F. Neubauer A.V. Bojar E. Hejl R. Handler D.E. García-Delgado Ciencias de la Tierra Cuba Calc Geochronology Transform fault Wrench corridor We summarize the available geological information on the Sierra Maestra Mountains in southeastern Cubaand report new zircon fission track and biotite Ar-Ar ages for this region. Two different and genetically unrelatedvolcanic arc sequences occur in the Sierra Maestra, one Cretaceous in age (pre-Maastrichtian) and restrictedto a few outcrops on the southern coast, and the other Palaeogene in age, forming the main expression of themountain range. These two sequences are overlain by middle to late Eocene siliciclastic, carbonatic and terrigenousrocks as well as by late Miocene to Quaternary deposits exposed on the southern flank of the mountainrange. These rocks are britle deformed and contain extension gashes filled with calcite and karst material. ThePalaeogene volcanic arc successions were intruded by calc-alkaline, low- to medium-K tonalites and trondhjemitesduring the final stages of subduction and subsequent collision of the Caribbean oceanic plate with theNorth American continental plate. U-Pb SHRIMP single zircon dating of five granitoid plutons yielded206Pb/238U emplacement ages between 60.5 ± 2.2 and 48.3 ± 0.5 Ma. These granitoids were emplaced at pressuresranging from 1.8 to 3.0 kbar, corresponding to depths of ca. 4.5-8 km. 40Ar/39Ar dating of two biotite concentratesyielded ages of 50 ± 2 and 54 ± 4 Ma, indicating cooling through ca. 300 ºC. Zircon and apatite fissiontrack ages range from 32 ± 3 to 46 ± 4 Ma and 31 ± 10 to 44 ± 13 Ma, respectively, and date cooling through250 ± 50 ºC and 110 ± 20 ºC. The granitoids are the result of subduction-related magmatism and have geochemicalcharacteristics similar to those of magmas from intra-oceanic island-arcs such as the Izu Bonin-Mariana arcand the New Britain island arc. 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 asfound worldwide in intra-oceanic arcs, and they probably formed through fractional crystallization of mantlederivedlow- to medium-K basalts. Several distinct phases of deformation were recognized in the Sierra Maestra,labelled D1 to D6, which define the transition from collision of the Palaeogene island arc to the formation ofthe Oriente Transform Wrench Corridor south of Cuba and later movement of the Caribbean plate against theNorth American plate. The first phase (D1) is related to the intrusion of a set of extensive subparallel, N-trendingsubvertical basalt-andesite dykes, probably during the early to middle Eocene. Between the late-middleEocene and early Oligocene (D2), rocks of the Sierra Maestra were deformed by approximately east-west trendingfolds and north-vergent thrust faults. This deformation (D2) was linked to a shift in the stress regime of theCaribbean plate from mainly NNE-SSW to E-W. This shift in plate motion caused the abandonment of theNipe-Guacanayabo fault system in 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540207 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 |
| format | Artículo científico |
| id | redalyc_50540207 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universitat de Barcelona |
| spellingShingle | Geology, age and tectonic evolution of the Sierra Maestra Mountains, southeastern Cuba Y. Rojas-Agramonte Ciencias de la Tierra Cuba Calc Geochronology Transform fault Wrench corridor Geology, age and tectonic evolution of the Sierra Maestra Mountains, southeastern Cuba Y. Rojas-Agramonte F. Neubauer A.V. Bojar E. Hejl R. Handler D.E. García-Delgado Ciencias de la Tierra Cuba Calc Geochronology Transform fault Wrench corridor We summarize the available geological information on the Sierra Maestra Mountains in southeastern Cubaand report new zircon fission track and biotite Ar-Ar ages for this region. Two different and genetically unrelatedvolcanic arc sequences occur in the Sierra Maestra, one Cretaceous in age (pre-Maastrichtian) and restrictedto a few outcrops on the southern coast, and the other Palaeogene in age, forming the main expression of themountain range. These two sequences are overlain by middle to late Eocene siliciclastic, carbonatic and terrigenousrocks as well as by late Miocene to Quaternary deposits exposed on the southern flank of the mountainrange. These rocks are britle deformed and contain extension gashes filled with calcite and karst material. ThePalaeogene volcanic arc successions were intruded by calc-alkaline, low- to medium-K tonalites and trondhjemitesduring the final stages of subduction and subsequent collision of the Caribbean oceanic plate with theNorth American continental plate. U-Pb SHRIMP single zircon dating of five granitoid plutons yielded206Pb/238U emplacement ages between 60.5 ± 2.2 and 48.3 ± 0.5 Ma. These granitoids were emplaced at pressuresranging from 1.8 to 3.0 kbar, corresponding to depths of ca. 4.5-8 km. 40Ar/39Ar dating of two biotite concentratesyielded ages of 50 ± 2 and 54 ± 4 Ma, indicating cooling through ca. 300 ºC. Zircon and apatite fissiontrack ages range from 32 ± 3 to 46 ± 4 Ma and 31 ± 10 to 44 ± 13 Ma, respectively, and date cooling through250 ± 50 ºC and 110 ± 20 ºC. The granitoids are the result of subduction-related magmatism and have geochemicalcharacteristics similar to those of magmas from intra-oceanic island-arcs such as the Izu Bonin-Mariana arcand the New Britain island arc. 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 asfound worldwide in intra-oceanic arcs, and they probably formed through fractional crystallization of mantlederivedlow- to medium-K basalts. Several distinct phases of deformation were recognized in the Sierra Maestra,labelled D1 to D6, which define the transition from collision of the Palaeogene island arc to the formation ofthe Oriente Transform Wrench Corridor south of Cuba and later movement of the Caribbean plate against theNorth American plate. The first phase (D1) is related to the intrusion of a set of extensive subparallel, N-trendingsubvertical basalt-andesite dykes, probably during the early to middle Eocene. Between the late-middleEocene and early Oligocene (D2), rocks of the Sierra Maestra were deformed by approximately east-west trendingfolds and north-vergent thrust faults. This deformation (D2) was linked to a shift in the stress regime of theCaribbean plate from mainly NNE-SSW to E-W. This shift in plate motion caused the abandonment of theNipe-Guacanayabo fault system in 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540207 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 |
| title | Geology, age and tectonic evolution of the Sierra Maestra Mountains, southeastern Cuba |
| topic | Ciencias de la Tierra Cuba Calc Geochronology Transform fault Wrench corridor |
| url | https://www.redalyc.org/articulo.oa?id=50540207 |