Publication: Estratigrafía del Cretácico Superior de la Cordillera Oriental de la República Dominicana
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2007
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García-Senz, J.
Monthel, J.
Díaz de Neira, J.A.
Hernaiz Huerta, P.P.
Escuder Viruete, J.
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Instituto Geológico y Minero de España
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Abstract
La sucesión del Cretácico Superior de la Cordillera Oriental de la República Dominicana contiene cerca de 6 km de rocas volcanogénicas sedimentarias y volcánicas depositadas en un sistema de talud sobre el extinto arco volcánico del Cretácico Inferior. Está limitada por dos discordancias que permiten caracterizarla como una secuencia deposicional. La inferior es consecuencia de los procesos de disgregación gravitacional que acompañan la formación del talud submarino; la superior se debe a la truncación subaérea de estructuras contractivas. Las formaciones estratigráficas se agrupan en tres episodios deposicionales: (1) Cenomaniense-Santoniense (Fm Las Guayabas y miembros relacionados) formado por una asociación de grauwacas volcanogénicas, rocas piroclásticas, lavas, lutitas silíceas y calizas pelágicas, que indican la proximidad del arco volcánico, (2) Santoniense formado exclusivamente por silexitas de radiolarios (Fm Arroyo La Yabana), indicando el cese de los aportes clásticos, (3) Santoniense-Maastrichtiense formado por calcilutitas y turbiditas con granos y clastos de carbonatos de plataforma somera y líticos-volcánicos (Fm Río Chavón y Mb Las Auyamas) y, únicamente en el Maastrichtiense, calcarenitas costeras y parches de rudistas sobre montículos de serpentinita (Fm Loma de Anglada). La curva de subsidencia para el Cretácico Superior se inicia con una aceleración alrededor del Cenomaniense que culmina en el Santoniense, se ralentiza en el Campaniense Maastrichtiense y termina con una importante elevación en la base del Paleoceno. La posición de la secuencia deposicional de la Cordillera Oriental respecto al resto de unidades geotectónicas del margen norte de la Placa del Caribe sugiere su deposición en una cuenca de ante-arco.
The Upper Cretaceous succession in the Oriental Cordillera of Dominican Republic contains near 6 km of secondary and primary volcaniclastics, deposited in a slope-apron system developed on the extinct lower Cretaceous volcanic-arc. It conforms a depositional sequence, bounded by two angular unconformities: the base unconformity is submarine and results from mass-wasting processes operating in the nascent, oversteeped slope; the top unconformity results from the subaerial truncation of contractive structures. The stratigraphical succession is comprised of three depositional episodes: (1) Cenomanian-Santonian (Las Guayabas Fm and related members) composed of an association of volcanogenic greywackes, pyroclastic rocks, lava flows, silicified lime and pelagic limestones, indicating the proximity of the arc, (2) Santonian episode, made of thin beds of radiolarian chert (Arroyo La Yabana Fm) pointing to the cease of the clastic input from the slope, and (3) Santonian-Maastrichtian composed of calcilutites and coarse-redeposited limestones (Río Chavón Fm and Las Auyamas Mb) and, only in the Maastrichtian, coastal calcarenites and rudist patch reefs lying on serpentinite seamounts (Loma de Anglada Fm). The subsidence curve for the Late Cretaceous starts with an acceleration around the Cenomanian, peaks in the Santonian, decelerates in the Campanian-Maastrichtian, and ends with an important uplift at the base of the Paleocene. The location of the Oriental Cordillera deposits in respect to the other geotectonic units of the northern Caribbean Plate boundary suggest deposition in a fore-arc basin.
The Upper Cretaceous succession in the Oriental Cordillera of Dominican Republic contains near 6 km of secondary and primary volcaniclastics, deposited in a slope-apron system developed on the extinct lower Cretaceous volcanic-arc. It conforms a depositional sequence, bounded by two angular unconformities: the base unconformity is submarine and results from mass-wasting processes operating in the nascent, oversteeped slope; the top unconformity results from the subaerial truncation of contractive structures. The stratigraphical succession is comprised of three depositional episodes: (1) Cenomanian-Santonian (Las Guayabas Fm and related members) composed of an association of volcanogenic greywackes, pyroclastic rocks, lava flows, silicified lime and pelagic limestones, indicating the proximity of the arc, (2) Santonian episode, made of thin beds of radiolarian chert (Arroyo La Yabana Fm) pointing to the cease of the clastic input from the slope, and (3) Santonian-Maastrichtian composed of calcilutites and coarse-redeposited limestones (Río Chavón Fm and Las Auyamas Mb) and, only in the Maastrichtian, coastal calcarenites and rudist patch reefs lying on serpentinite seamounts (Loma de Anglada Fm). The subsidence curve for the Late Cretaceous starts with an acceleration around the Cenomanian, peaks in the Santonian, decelerates in the Campanian-Maastrichtian, and ends with an important uplift at the base of the Paleocene. The location of the Oriental Cordillera deposits in respect to the other geotectonic units of the northern Caribbean Plate boundary suggest deposition in a fore-arc basin.