Geometry, structure and geodynamics of a sand wave complex in the southeast margin of the Eocene Catalan basin, Spain
Santisteban, C.; Taberner, C. (1988). Geometry, structure and geodynamics of a sand wave complex in the southeast margin of the Eocene Catalan basin, Spain, in: de Boer, P.L. et al. (Ed.) Tide-influenced sedimentary environments and facies. Extended versions of papers presented at the Symposium on Classic Tidal Deposits, held August 1985 in Utrecht, Netherlands. pp. 123-138 In: de Boer, P.L. et al. (Ed.) (1988). Tide-influenced sedimentary environments and facies. Extended versions of papers presented at the Symposium on Classic Tidal Deposits, held August 1985 in Utrecht, Netherlands. D. Reidel Publishing: Dordrecht. ISBN 90-277-2622-1. ix, 530 pp., more |
| Authors | | Top | - Santisteban, C.
- Taberner, C.
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| Abstract | Different stages of tidal action have been distinguished in the nearshore facies associations of the Eocene Catalan Basin (Vic area). One of these stages corresponds to the Upper Lutetian - Lower Biarritzian Folgueroles Fm. deposits. These tidal sediments accumulated in a subsiding trough controlled by NNW- SSE fractures, that were active from the Paleocene to the Middle Eocene. The tidal influence in these deposits during a generalized transgresive stage could have been favoured by the synsedimentary activity of these fractures. The synsedimentary features of the different facies associations, as well as facies relationships, fit in with sand wave models proposed for recent and ancient tidal complexes. Three development stages have been recognized in the sand wave units that constitute the Folgueroles tidal complex. Sand waves developed in ebb conditions during the first stage. However, during a later stage, prior to the abandonment and stabilization of the sedimentary bodies, sedimentation occurred under conditions of greater symmetry of ebb-flood currents or the record of floodcurrent became more apparent. The features of these deposits and their regional setting indicate that the sand wave complex would have developed in a broad sense in an estuarine environment, possibly controlled by the NNW - SSE synsedimentary fractures, where the Middle Eocene transgressive stage of the Eocene Catalan Basin (Vic area) must have been more effective. Reworking of sediments of previous shallow platforms occurred. There was also reworking of terrigenous supplies introduced into the basin through delta and fan-delta systems located in more stable, shallower areas. |
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