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Patch-Reefs in the Ciénaga de Oro Formation (Oligocene–Miocene, San Jacinto Fold Belt,  NW Colombia)
Poster Title: Patch-Reefs in the Ciénaga de Oro Formation (Oligocene–Miocene, San Jacinto Fold Belt, NW Colombia)
Submitted on 20 Jun 2016
Author(s): Edward Salazar(1), Juan C. Braga(2), Paola Flórez(2), Daniel Rincón(3), Peter O. Baumgartner(4), Claudia Baumgartner-Mora(4)
Affiliations: 1). UT UP Consultorias, Colombia. 2) Departamento de Estratigrafía y Paleontología, Universidad de Granada, Spain. 3) Instituto Colombiano del Petróleo, ICP-Ecopetrol S.A, Colombia. 4) Institut des Sciences de la Terre, Université de Lausanne, Switzerland
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Abstract: Coral patch-reefs occur in thin carbonate bodies (up to 20 m thick) at the top of the Ciénaga de Oro Formation, which comprises thick successions of sandstones, siltstones, and clays within the Cenozoic deposits of the San Jacinto Fold Belt in the southern Caribbean (Colombia). In the Canta Gallo quarry, 40 km east of Montería, carbonate lithofacies reflect a rapid transgression of middle-ramp branching coralline algal floatstone to rudstone over shallow-water bioclastic sandstone. Rhodolith floatstone and packstone with dispersed platy corals initiate a regressive pattern continued by coral mixstone (3 m thick) and platestone (1.5 m thick), which make up the patch-reef deposits. The top of the carbonate sequence consists of trough cross-bedded rudstones with terrigenous grains rich in sand dollars, representing shoal sediments. Strong cementation and recrystallization of coral-rich lithofacies prevent any precise identification of coral taxa. Poritids, agathiphylliids, pocilloporids (Stylophora), and mussids seem to be the main components. Sr-isotope chemostratigraphic data indicate the Ciénaga de Oro Formation is Late Oligocene to Early Miocene in age. Larger benthic foraminifers suggest an Oligocene age for the Canta Gallo carbonates. These patch-reefs extend the geographic distribution of zooxanthellate coral records of this age farther south in the Caribbean. Summary: Small coral patch-reefs occur in Oligocene carbonates in the Cienaga de Oro Formation in NW Colombia. They consist of poritids, agathiphyliids, pocilloporids (Stylophora) and mussids but recrystallization prevent any more precise identification. These patch-reefs extend to the south the geographic distribution of Oligocene zooxanthellate coral records in the Caribbean. Report abuse »
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