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|Type:||Artigo de periódico|
|Title:||Diachronic Cenozoic Wrenching In Southwest Of The Colombian Basin [transcorrência Diacrônica Cenozóica No Sudoeste Da Bacia Colombiana]|
|Abstract:||We propose a major Eocene tectonic inversion related to an oblique convergence between Farallon (after Cocos plate) and Caribbean plates in the offshore of Colombian Caribbean. Between Eocene- Oligocene occurred an extension and another tectonic inversion since Oligocene to Pleistocene. By structural and stratigraphic evidence extracted from seismic, gravity and well data, we identified diverse diachronic Cenozoic deformations related to an important syndepositional wrenching event. Diachronic wrench system corresponds with Riedel structures and subordinated related-structures which have been growing progressively from north to south as result of convergence of Farallon (after Cocos plate) and Caribbean plates. Older basement-involved structures were inverted since Eocene. Tectonic inversions were interpreted from different strata geometries, relations of strata, growth strata and erosive truncations. A regional Eocene unconformity defined by erosional truncations reveals the timing of tectonic inversion and consequently closure of Colombian basin at northern boundary. The Eocene erosional unconformity becomes conformable toward the basin and should be an important correlative stratigraphic surface in the Caribbean offshore. © 2013 LNEG - Laboratório Nacional de Geologia e Energia IP.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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