New constraints on the Messinian sealevel drawdown from 3D seismic data of the Ebro Margin, western Mediterranean

Úrgeles, Roger; Camerlenghi, Angelo; García‐Castellanos, Daniel; Mol, Ben De; Garcés, Miquel; Vergés, Jaume; Haslam, Ian; Hardman, Martin

doi:10.1111/j.1365-2117.2010.00477.x

Cited by 92 publications

(97 citation statements)

References 72 publications

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“…The opening of the Ebro basin through the CCR toward the Mediterranean Sea occurred during the late Miocene, leading to kilometer-scale excavation throughout the basin (Fillon and Van der Beek, 2012;Fillon et al, 2013;GarciaCastellanos and Larrasoaña, 2015). The exact timing and processes driving the opening, as well as the role of the Messinian Salinity Crisis, has long been debated (Coney et al, 1996 (post-Messinian); Garcia-Castellanos et al, 2003 (13-8.5 Ma); Babault et al, 2006 (post-Messinian); Urgeles et al, 2010;Cameselle et al, 2014 (Serravallian-Tortonian); Garcia-Castellanos and Larrasoaña, 2015 (12-7.5 Ma)). In contrast with the Ebro basin, incision in the upper Duero basin appears much less significant.…”

Section: The Ebro and Duero Basinsmentioning

confidence: 99%

Drainage reorganization and divide migration induced by the excavation of the Ebro basin (NE Spain)

2018

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Abstract. Intracontinental endorheic basins are key elements of source-to-sink systems as they preserve sediments eroded from the surrounding catchments. Drainage reorganization in such a basin in response to changing boundary conditions has strong implications on the sediment routing system and on landscape evolution. The Ebro and Duero basins represent two foreland basins, which developed in response to the growth of surrounding compressional orogens, the Pyrenees and the Cantabrian mountains to the north, the Iberian Ranges to the south, and the Catalan Coastal Range to the east. They were once connected as endorheic basins in the early Oligocene. By the end of the Miocene, new post-orogenic conditions led to the current setting in which the Ebro and Duero basins are flowing in opposite directions, towards the Mediterranean Sea and the Atlantic Ocean. Although these two hydrographic basins recorded a similar history, they are characterized by very different morphologic features. The Ebro basin is highly excavated, whereas relicts of the endorheic stage are very well preserved in the Duero basin. The contrasting morphological preservation of the endorheic stage represents an ideal natural laboratory to study the drivers (internal and/or external) of post-orogenic drainage divide mobility, drainage network, and landscape evolution. To that aim, we use field and map observations and we apply the χ analysis of river profiles along the divide between the Ebro and Duero drainage basins. We show here that the contrasting excavation of the Ebro and Duero basins drives a reorganization of their drainage network through a series of captures, which resulted in the southwestward migration of their main drainage divide. Fluvial captures have a strong impact on drainage areas, fluxes, and their respective incision capacity. We conclude that drainage reorganization driven by the capture of the Duero basin rivers by the Ebro drainage system explains the first-order preservation of endorheic stage remnants in the Duero basin, due to drainage area loss, independently from tectonics and climate.

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Section: The Ebro and Duero Basinsmentioning

confidence: 99%

Drainage reorganization and divide migration induced by the excavation of the Ebro basin (NE Spain)

2018

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“…For the fl exural calculations we use a pure elastic thin-plate approach (Turcotte and Schubert, 1982) with an equivalent elastic thickness of 15 km (Gaspar-Escribano et al, 2004) and a 1.92 g cm-3 mean sediment density calculated from the nearby Fornax-1 exploration well data (adopted Young's modulus is 7 × 1010 Pa). To backstrip we also applied the sediment decompaction parameters (described in Urgeles et al, 2010), using a 0.479 initial porosity (dimensionless) and a 0.42 compaction coeffi cient (km-1), both calculated from the Fornax-1 well data.…”

Section: Data Set and Methodsmentioning

confidence: 99%

“…For the time-depth conversion in the distance-depth profi les we used the function detailed in Urgeles et al (2010), calibrated from the sonic log in the Fornax-1 well (Fig. 1).…”

Section: Data Set and Methodsmentioning

confidence: 99%

“…1). This passive margin is characterized by a relatively wide continental shelf (70 km in the studied sector) built principally by sediment inputs from the Ebro River since the Middle Miocene (Urgeles et al, 2010, and references therein). The modern EM continental slope is densely canyonized, though few canyons exceed 500 m of relief in their upper courses.…”

Section: Geological Frameworkmentioning

confidence: 99%

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Survival of a submarine canyon during long-term outbuilding of a continental margin

Amblàs¹,

Gerber²,

Mol³

et al. 2012

Geology

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Net-depositional submarine canyons are common in continental slope strata, but how they survive and prograde on constructional margins is poorly understood. In this study we present fi eld evidence for the coevolution of a submarine canyon and the adjacent continental slope. Using a three-dimensional seismic data cube that images the Ebro margin (northwest Mediterranean), we identify a preserved canyon on a middle Pleistocene paleosurface and relate it directly to its expression on the present-day seafl oor. A subparallel stacking pattern of seismic refl ectors, similar to that seen between prograding clinoforms in intercanyon areas, is observed between the modern and paleocanyon thalwegs. The concavity of the modern long profi le differs from the convexconcave long profi le on the middle Pleistocene surface, suggesting a long-term change in canyon sedimentation. We interpret this change as a shift to a canyon dominated by turbidity currents from one strongly infl uenced by the pattern of sedimentation that built the open-slope canyon interfl uves. We fi nd support for our interpretation in previous studies of the Ebro margin.

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“…We do not think that this is the case. Our study area is relatively small (~500 km 2 ) and the continental slope is characterised by quasi-uniform slope gradient, structure, substrate and oceanographic conditions (Farrán and Maldonado, 1990;Field and Gardner, 1990; Font et al, 1990;Amblas et al, 2006Amblas et al, , 2011Amblas et al, , 2012Urgeles et al, 2011). The material being eroded is predominantly Plio-Quaternary shelf-margin deltaic and slope depositional units, whilst the control of extensional and thrust faults on the seafloor is more important further south.…”

mentioning

confidence: 99%

Space-for-time substitution and the evolution of a submarine canyon–channel system in a passive progradational margin

et al. 2014

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Please cite this article as: Micallef, Aaron, Ribó, Marta, Canals, Miquel, Puig, Pere, Lastras, Galderic, Tubau, Xavier, Space-for-time substitution and the evolution of a submarine canyon-channel system in a passive progradational margin, Geomorphology (2014), doi: 10.1016/j.geomorph.2014.06.008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT1 Manuscript submitted to Geomorphology:Space-for-time substitution and the evolution of a submarine canyon-channel system in a passive progradational margin. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractSpace-for-time substitution is a concept that has been widely applied, but not thoroughly tested in some fields of geomorphology. The objective of this study is to test whether the concept of space-for-time substitution is valid in reconstructing the evolution of a submarine canyonchannel system in a passive progradational margin. We use multibeam echosounder data and in situ measurements from the south Ebro Margin to analyse the morphology and morphometry of a sequence of submarine valleys ordered in terms of increasing valley thalweg length. The morphological model of submarine valley evolution that we can propose from this analysis is very similar to established models in the literature, which leads us to conclude that time can be substituted by space when reconstructing the evolution of submarine canyon and channel systems in the south Ebro Margin. By extracting morphometric information from the application of the space-for-time substitution model to our data, we identify a series of morphological patterns as a submarine canyon evolves in a passive progradational margin. These include the geometric similarity of canyon planform shape, an increase in canyon draining efficiency and in the influence of flank slope failures, and an evolution towards equilibrium between canyon form and imposed water and sediment load without net erosion or deposition taking place. We also observe that canyon elongation is higher downslope and that the canyon undergoes an early stage of rapid incision similar to the process of "erosion narrowing" reported in terrestrial rivers. We demonstrate that the conclusions of our study are not limited to submarine valleys in the south Ebro Margin but are applicable to other margins around the world. A C C E P T E D M A N U S C R I P TACCEPTED MANUSCRIPT 3 IntroductionGeoscientists are generally unable to fully observe landscape-forming processes because the time-scale of the observer and the time-scale of many geomorphic phenomena are very different.One approach to...

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New constraints on the Messinian sealevel drawdown from 3D seismic data of the Ebro Margin, western Mediterranean

Cited by 92 publications

References 72 publications

Drainage reorganization and divide migration induced by the excavation of the Ebro basin (NE Spain)

Drainage reorganization and divide migration induced by the excavation of the Ebro basin (NE Spain)

Survival of a submarine canyon during long-term outbuilding of a continental margin

Space-for-time substitution and the evolution of a submarine canyon–channel system in a passive progradational margin

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