Preprint Article Version 1 This version is not peer-reviewed

Anatomy, Age and Origin of an Intramontane Top Basin Surface (Sorbas Basin, Betic Cordillera, SE Spain)

Version 1 : Received: 29 June 2018 / Approved: 4 July 2018 / Online: 4 July 2018 (11:06:16 CEST)
Version 2 : Received: 17 August 2018 / Approved: 18 August 2018 / Online: 18 August 2018 (08:50:50 CEST)

How to cite: Stokes, M.; Mather, A.E.; Rodés, Á.; Kearsey, S.H.; Lewin, S. Anatomy, Age and Origin of an Intramontane Top Basin Surface (Sorbas Basin, Betic Cordillera, SE Spain). Preprints 2018, 2018070070 (doi: 10.20944/preprints201807.0070.v1). Stokes, M.; Mather, A.E.; Rodés, Á.; Kearsey, S.H.; Lewin, S. Anatomy, Age and Origin of an Intramontane Top Basin Surface (Sorbas Basin, Betic Cordillera, SE Spain). Preprints 2018, 2018070070 (doi: 10.20944/preprints201807.0070.v1).

Abstract

Collisional mountain belts commonly develop intramontane basins from mechanical and isostatic subsidence during orogenic These frequently display a relict top surface, evidencing a change  interval from basin infilling  to erosion often via  capture  or overspill.  Such surfaces provide  markers  that  inform  on orogenic  growth patterns  via  climate  and  base level Here, we describe the top surface from the Sorbas Basin, a key intramontane basin within the Betic Cordillera (SE Spain). The surface is fragmentary comprising high elevation hilltops and discontinuous ridges developed onto the variably deformed final basin infill outcrop (Gochar Formation). We reconstruct surface configuration using DEM interpolation and apply 10Be/26Al cosmonuclides to assess surface formation The surface is an Early Pleistocene erosional pediment developed via autogenic switching of alluvial fan streams under stable dryland climate and base level Base level lowering since the Middle Pleistocene focused headwards incision up interfan drainages, culminating in fan head capture and fan morphological preservation within the abandoned Post abandonment erosion has lowered the basin surface by 31 m (average) and removed ~5.95 km3 of fill. Regional basin comparisons reveal a phase of Early Pleistocene surface formation, marking landscape stability following the most recent Pliocene-Early Pleistocene mountain Post-surface erosion rate quantification is low and in accordance with 10Be denudation rates typical of the low uplift Betic

Subject Areas

intramontane basin; pediment; glaci; alluvial fan; river terrace; DEM; interpolation; cosmonuclide; base level

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