Intraplate subsidence and basin filling adjacent to an oceanic arc–continent collision: a case from the southern Caribbean-South America plate margin
Article first published online: 22 NOV 2010
© 2010 The Authors. Basin Research © 2010 Blackwell Publishing Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists
Volume 23, Issue 4, pages 403–422, August 2011
How to Cite
Bayona, G., Montes, C., Cardona, A., Jaramillo, C., Ojeda, G., Valencia, V. and Ayala-Calvo, C. (2011), Intraplate subsidence and basin filling adjacent to an oceanic arc–continent collision: a case from the southern Caribbean-South America plate margin. Basin Research, 23: 403–422. doi: 10.1111/j.1365-2117.2010.00495.x
- Issue published online: 4 JUL 2011
- Article first published online: 22 NOV 2010
- Manuscript received 12 August 2009; Manuscript accepted 15 October 2010.
The upper Campanian–Lower Eocene synorogenic sedimentary wedge of the Ranchería Basin was deposited in an intraplate basin resting on a tilted continental crustal block that was deformed by collision and subsequent subduction of the Caribbean Plate. Upper Cretaceous–Lower Eocene strata rest unconformably upon Jurassic igneous rocks of the Santa Marta Massif, with no major thrust faults separating the Santa Marta Massif from the Ranchería Basin. The upper Campanian–Lower Eocene succession includes, from base to top: foraminifera-rich calcareous mudstone, mixed carbonate–siliciclastic strata and mudstone, coal and immature fluvial sandstone beds. Diachronous collision and eastward tilting of the plate margin (Santa Marta Massif and Central Cordillera) favoured the generation of accommodation space in a continuous intraplate basin (Ranchería, Cesar and western Maracaibo) during the Maastrichtian to Late Palaeocene. Terrigenous detritus from the distal colliding margin filled the western segments of the continuous intraplate basin (Ranchería and Cesar Basins); in the Late Paleocene, continental depositional systems migrated eastwards as far as the western Maracaibo Basin. In Early Eocene time, reactivation of former extensional structures fragmented the intraplate basin into the Ranchería-Cesar Basins to the west, and the western Maracaibo Basin and Palmar High to the East. This scenario of continent–oceanic arc collision, crustal-scale tilting, intraplate basin generation and fault reactivation may apply for Upper Cretaceous–Palaeogene syntectonic basins in western Colombia and Ecuador, and should be considered in other settings where arc–continent collision is followed by subduction.