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- W2029760177 abstract "Abstract The ca 300 m thick Guaso system is the youngest part of the ca 4 km thick deep‐marine fill of the Middle Eocene Ainsa basin, Spanish Pyrenees. It is overlain by 150 to 200 m of fine‐grained slope, prodelta and deltaic sediments. The ca 25 discrete deep‐marine sandbodies within the Ainsa basin accumulated over ca 10 Myr, making eustasy the most likely control for coarse sand deposition (probably the ca 400 kyr Milankovitch mode). The first‐order control on basin‐scale accommodation, however, was tectonically‐driven subsidence. Previously, the Guaso sandbodies were interpreted as linked to deep erosional, canyon‐like features, but here it is argued that they are laterally extensive sandbodies, built by lateral‐switching of 3 to 10 m deep erosional channels, and confined only by basin structure during deposition. The Guaso system represents the end of deep‐marine deposition in a structurally‐confined, delta‐fed, low‐gradient clastic system. The critical end‐signature of deep‐marine deposition was a phase of differential tectonic uplift above the underlying (Boltaña) thrust creating a narrower and shallower basin morphology, thus allowing sedimentation to create a low‐gradient clastic system. Then, the next eustatic sea‐level fall was insufficient to permit the cutting of canyons or deeply‐incised slope channels, as had been the case earlier when the topographic relief between shelf and basin was at least several hundred metres greater. Such low‐gradient clastic systems may characterize the end‐signature for the infill of other shallowing‐up deep‐marine basins where a tectonic driver on subsidence is removed and/or differential uplift/subsidence leads to reduced sea floor gradients, leaving eustasy and sediment flux as the principal control on sediment supply." @default.
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- W2029760177 date "2009-09-15" @default.
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- W2029760177 title "End-signature of deep-marine basin-fill, as a structurally confined low-gradient clastic system: the Middle Eocene Guaso system, South-central Spanish Pyrenees" @default.
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- W2029760177 doi "https://doi.org/10.1111/j.1365-3091.2009.01051.x" @default.
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