Caribbean crustal provinces; Seismic and gravity evidence

Case, James E.; MacDonald, W. D.; Fox, Paul J.

doi:10.1130/dnag-gna-h.15

Cited by 59 publications

(76 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The thickened nature (∼8-20 km) [Edgar et al, 1971;Case et al, 1990;Mauffret and Leroy, 1997] of the oceanic crust of the Caribbean plate and its probable Pacific origin. Their chemical and petrological compositions provide significant evidence that the Caribbean seafloor is in large part the remnant of the CCOP [Kerr et al, 2003].…”

Section: Tectonic Evolution Of La Désirade: a Key Aspect Of Caribbeanmentioning

confidence: 99%

Discovery of Lower Cretaceous synmetamorphic thrust tectonics in French Lesser Antilles (La Désirade Island, Guadeloupe): Implications for Caribbean geodynamics

et al. 2011

View full text Add to dashboard Cite

[1] Located east of Guadeloupe, the island of La Désirade exhibits the oldest rocks of the Lesser Antilles arc and the eastern Caribbean plate. An old magmatic basement is composed of (1) late Jurassic ophiolitic complex with meta-basaltic pillow lavas and interbedded radiolarites, (2) acid igneous complex comprising meta-quartz-diorite and meta-rhyolitic lavas flows, and (3) meta-diabasic/microdioritic dyke swarm complex. We present and discuss the discovery of synmetamorphic thrust tectonics in this island. Based on detailed structural analysis we evidenced two main compressive events. The first event (D1) is characterized by pervasive folding associated with thrust development. In the northeastern part of the island, a major thrust fault, the Grand Abaque Thrust, has been discovered which displaces for several kilometers the acid igneous complex onto the ophiolitic unit. The second deformation event (D2) is featured by a main pervasive cleavage S2 observed at the regional scale associated with upright folding (F2) and by the development of two sets of conjugated steeply dipping strike-slip shear zones, dextral 130°N and sinistral 20°N striking, respectively. Microstructural observations indicate that Greenschist facies metamorphism is clearly contemporaneous with the development of D1 and D2 superimposed tectonic structures. Ar/Ar geochronology was performed on two bulk of adularia minerals sampled in the northeast volcanic complex within a deformed zone related to a D2 event. These analyses yield well-defined and concordant plateau ages at 106.2 ± 1.7 Ma and 107.2 ± 1.8 Ma. Thus, shortening and thickening tectonics occurred during Lower Cretaceous (Albian). In the available framework of Caribbean geodynamics, the synmetamorphic thrust tectonics we discovered in the French Lesser Antilles is related to the collision between an Aptian-Albian oceanic plateau and the Andean-Cordilleran east-dipping subduction zone. Our results support subduction polarity reversal during Lower Cretaceous.

show abstract

Section: Tectonic Evolution Of La Désirade: a Key Aspect Of Caribbeanmentioning

confidence: 99%

Discovery of Lower Cretaceous synmetamorphic thrust tectonics in French Lesser Antilles (La Désirade Island, Guadeloupe): Implications for Caribbean geodynamics

et al. 2011

View full text Add to dashboard Cite

show abstract

“…La corteza de la placa del Caribe, sin embargo, no es homogénea, pues al occidente de la cresta de Beata su espesor es de 20 km y hacia el sureste de la cuenca de Venezuela es muy delgado, entre 2 y 5 km (Diebold & Driscoll, 1999). El espesor en las cuencas de Granada y Colombia oscila entre los 10 y 22 km (Case, et al, 1990).…”

Section: Marco Geológico Regionalunclassified

Metagabros de la isla Gran Roque (Venezuela). Geoquímica y petrografía

Toro-Toro

Moreno-Sánchez

Gómez-Cruz

et al. 2014

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

View full text Add to dashboard Cite

ResumenLa isla Gran Roque, situada al norte de Venezuela, es una de las pocas islas del sur del Caribe en donde afloran rocas de corteza oceánica. Estas rocas corresponden a metagabros de grano fino a grueso, con textura relicto subofítica definida por cristales de plagioclasa rodeados por minerales ferromagnesianos.La asociación de actinolita, clorita, plagioclasa y cuarzo indica que la roca alcanzó un grado metamórfico bajo en facies de esquisto verde. La composición geoquímica de las rocas de la isla Gran Roque es coherente con la clasificación petrográfica. Estas rocas muestran afinidad toleítica y patrones planos de tierras raras, lo que indica que provienen de magmas generados en dorsales oceánicas de tipo MORB-N.Palabras clave: Gran Roque, meta-gabros, MORB-N, Venezuela. Abstract Metagabbros of Gran Roque Island (Venezuela). Geochemistry and petrographyThe Gran Roque Island, located in northern Venezuela, is part of the southern Caribbean islands where the basic basement is outcropping. This basement is composed of fine-grained metagabbros, with subophitic relict texture defined by the larger plagioclase laths that enclose the ferromagnesian minerals.The mineral assemblage of chlorite-actinolite-plagioclase-quartz indicates that the rock reached a low metamorphic grade green schist facies. The chemistry of the Gran Roque island metaggabros supports the petrographic identification and characterization. These rocks exhibit tholeiitic affinity and REE flat patterns, which could be correlated to magmas generated at oceanic ridges of N-MORB type.

show abstract

“…: Case et al, 1990) prevén característi-cas oceánicas y transicionales para la corteza de las cuencas de Colombia y Venezuela y de transicionales a continentales para la corteza del margen de la placa (aparte de la dispersión oceánica presente en el sistema de Cayman). En el límite actual de la placa se involucran, a veces, amplios Fig.…”

Section: La Placa Del Caribe: Generalidadesunclassified

Geologia de las margenes de la placa del Caribe: generalidades en Guatemala, Costa Rica, la Española y resultados preliminares del analisis de una transversal en la cordillera de la costa de Venezuela

Giunta

Navarro

Beccaluva

et al. 2011

Rev. Geol. Amér. Central

View full text Add to dashboard Cite

ABSTRACT:The Caribbean Plate margins are constituted by deformed belts built up since the Cretaceous in a compressional and strike-slip stress field, which allowed overthrusting of the Caribbean crust onto the Pacific, North and South American Plates. The Caribbean borders include Jurassic-Cretaceous ophiolitic units (Great Antilles, Venezuela, Costa Rica, Guatemala, etc.), composed by mantle peridotites, gabbros, volcanic and sedimentary covers, which have been deformed in at least two ductile penetrative phases and were often metamorphosed in the prehnite-pumpelleyite, green and blue schist, amphibolite, and in places eclogite facies. These units may present part of a subduction complex or are an accretionary prism. This paper deals with a regional geological survey (1989)(1990)(1991)(1992)(1993) conducted on the main periCaribbean ophiolitic units of Guatemala, Costa Rica, Hispanola, and Venezuela. The preliminary data, recently updated with new and detailed researches, allow to recognize the magmatic affinities (MORB and IAT) of the different reconstructed lithological sequences, which can be related with an hypothetical kinematic model of the development of the Caribbean Plate.RESUMEN: Los márgenes de la placa del Caribe están constituidos por cinturones deformados debido a una serie de fases compresivas ocurridas desde el Cretácico, con esfuerzos tensionales y/o fallas transcurrentes superpuestos. Estos cinturones deformados contienen porciones variables de corteza caribeña sobrecorrida a las placas adyacentes (Norte y Suramericana, Pacífica). En las Antillas Mayores, Venezuela, Costa Rica y Guatemala se conocen unidades ofiolíticas de edad Jurásica-Cretácica, constituidas por secuencias de manto, corteza y una cubierta sedimentaria más o menos espesa; las secuencias se encuentran generalmente serpentinizadas, deformadas en al menos dos fases dúctiles penetrativas y metamorfizadas en las facies prehnita-pumpellita, esquistos azules y esquistos verdes. Desde el punto de vista tectónico-cinemático es posible incluir estas unidades en porciones de complejos de subducción construidos por accreción o "underplating". En el presente estudio regional sobre las principales unidades ofiolíticas de los márgenes del Caribe, se evidencian diferentes secuencias litológicas pertenecientes a procesos evolutivos con diferentes tendencias, desde MORB a IAT. Los resultados preliminares de una transversal en la Cordillera de la Costa de Venezuela permiten interpretar algunas secuencias litológicas como provenientes de protolitos tipo MORB.

show abstract

Caribbean crustal provinces; Seismic and gravity evidence

Cited by 59 publications

References 84 publications

Discovery of Lower Cretaceous synmetamorphic thrust tectonics in French Lesser Antilles (La Désirade Island, Guadeloupe): Implications for Caribbean geodynamics

Discovery of Lower Cretaceous synmetamorphic thrust tectonics in French Lesser Antilles (La Désirade Island, Guadeloupe): Implications for Caribbean geodynamics

Metagabros de la isla Gran Roque (Venezuela). Geoquímica y petrografía

Geologia de las margenes de la placa del Caribe: generalidades en Guatemala, Costa Rica, la Española y resultados preliminares del analisis de una transversal en la cordillera de la costa de Venezuela

Contact Info

Product

Resources

About