Fecha:
2008-0-0
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Categoria:
Artículo |
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Peso: 3880 Kb
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The role of inherited extensional fault segmentation and linkage in contractional orogenesis: a reconstruction of Lower Cretaceous inverted rift basins in the Eastern Cordillera of Colombia |
Autores:
Andrés Mora,Tatiana Gaona,w Jonas Kley,z Diana Montoya,w Mauricio Parra, n Luis Ignacio Quiroz, German Reyes and Manfred R. Streckern |
Descripción:
Lower Cretaceous early syn-rift facies along the eastern £ank of the Eastern Cordillera of Colombia,
their provenance, and structural context, reveal the complex interactions between Cretaceous
extension, spatio-temporal trends in associated sedimentation, and subsequent inversion of the
CretaceousGuatiqu|¤a paleo-rift. South of 41300Nlat, early syn-rift alluvial sequences in former
extensional footwall areas were contemporaneous with fan-delta deposits in shallow marine
environments in adjacent hanging-wall areas. In general, footwall erosion was more pronounced in
the southern part of the paleorift. In contrast, early syn-rift sequences in former footwall areas in the
northern rift sectors mainly comprise shallow marine supratidal sabkha to intertidal strata, whereas
hanging-wall units display rapid transitions to open- sea shales. In comparison with the southern
paleo-rift sector, fan-delta deposits in the north are scarce, and provenance suggests negligible
footwall erosion. |
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