2024-03-29T05:13:21Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1571892019-10-14T09:49:56Zcom_10261_82com_10261_8col_10261_335
Recycling an uplifted early foreland basin fill: An example from the Jaca basin (Southern Pyrenees, Spain)
Roige, M.
Gómez-Gras, David
Remacha, E.
Boya, S.
Viaplana-Muzas, M.
Teixell, A.
Ministerio de Economía y Competitividad (España)
Universidad Autónoma de Barcelona
Sediment sources
Pyrenees
Jaca basin
Recycling
Alluvial fans
Provenance
In the northern Jaca basin (Southern Pyrenees), the replacement of deep-marine by terrestrial environments during the Eocene records a main drainage reorganization in the active Pyrenean pro-wedge, which leads to recycling of earlier foreland basin sediments. The onset of late Eocene-Oligocene terrestrial sedimentation is represented by four main alluvial fans: Santa Orosia, Cancias, Pena Oroel and San Juan de la Pena, which appear diachronously from east to west. These alluvial fans are the youngest preserved sediments deposited in the basin. We provide new data on sediment composition and sources for the late Eocene-Oligocene alluvial fans and precursor deltas of the Jaca basin. Sandstone petrography allows identification of the interplay of axially-fed sediments from the east with transversely-fed sediments from the north. Compositional data for the alluvial fans reflects a dominating proportion of recycled rock fragments derived from the erosion of a lower to middle Eocene flysch depocentre (the Hecho Group), located immediately to the north. In addition, pebble composition allows identification of a source in the North Pyrenean Zone that provided lithologies from the Cretaceous carbonate flysch, Jurassic dolostones and Triassic dolerites. Thus we infer this zone as part of the source area, located in the headwaters, which would have been unroofed from turbidite deposits during the late Eocene-Oligocene. These conclusions provide new insights on the response of drainage networks to uplift and topographic growth of the Pyrenees, where the water divide migrated southwards to its present day location. (C) 2017 Elsevier B.V. All rights reserved.
2017-11-10T10:48:59Z
2017-11-10T10:48:59Z
2017-10
artículo
Sedimentary Geology, 360: 1–21 (2017)
0037-0738
http://hdl.handle.net/10261/157189
10.1016/j.sedgeo.2017.08.007
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100011104
eng
https://doi.org/10.1016/j.sedgeo.2017.08.007
Sí
closedAccess
Elsevier