The upper cenozoic evolution of the Duero and Ebro fluvial systems (N-Spain): part I. paleogeography; part II. geomorphology |
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| Authors: | Daniel Mike? |
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| Institution: | 1. Department of Earth Sciences, Stellenbosch University, Private Bag X1, 7602, Matieland, South Africa
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| Abstract: | Lack of age dates in the terrigenous Cenozoic sediments of the Duero and the Ebro sedimentary basins has complicated tecto-stratic correlation across the two basins. We tentatively synthesize a range of existing studies and new data to construct a rough general paleogeography throughout Upper Cenozoic times. The more extensive erosion of the Ebro has been previously attributed to the earlier moment of opening. We tentatively analyse lithostratic data to conclude that the lower knick-point and different lithologies have also contributed to the deeper erosion in the Ebro Basin. We conclude from lithostratic data and field evidence that the W half of the Rioja was part of the Duero in earlier times and that the escarpment retreated westward through the Rioja in four subsequent episodes of erosion. The tilt of the NW Duero is a consequence of isostatic rebound to this erosion. |
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