Deep-marine structurally confined channelised sandy fans: Middle Eocene Morillo System, Ainsa Basin, Spanish Pyrenees

Bayliss, Nicole; Pickering, Kevin T.

doi:10.1016/j.earscirev.2014.11.014

Cited by 26 publications

(9 citation statements)

References 60 publications

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“…The thick package of F.A.3 mud‐prone deposits might have recorded a retrogradation of the slope environment and a substantial reduction of the sea‐floor gradient, favouring the establishment of a near base of slope setting. A similar stratigraphic trend, related to tectonically‐induced variations of the sea‐floor gradient, has been documented by Bayliss & Pickering (2015b) in the Morillo System of the Ainsa basin (Spain).…”

Section: Discussionmentioning

confidence: 98%

Multi‐scale analysis of a migrating submarine channel system in a tectonically‐confined basin: The Miocene Gorgoglione Flysch Formation, southern Italy

et al. 2018

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The Miocene Gorgoglione Flysch Formation records the stratigraphic product of protracted sediment transfer and deposition through a long‐lived submarine channel system developed in a narrow and elongate thrust‐top basin of the Southern Apennines (Italy). Channel‐fill deposits are exposed in an outcrop belt approximately 500 m thick and 15 km long, oriented oblique to the palaeoflow, which was roughly south‐eastward. These exceptional exposures of channel‐fill strata allow the stacking architectures and the evolution of the channel system to be analyzed at multiple scales, enabling the effects of syn‐sedimentary thrust tectonics and basin confinement on the depositional system development to be deciphered. Two end‐member types of elementary channel architecture have been identified: high‐aspect‐ratio, weakly‐confined channels, and low‐aspect‐ratio, incisional channels. Their systematic stacking results in a complex pattern of seismic‐scale depositional architectures that determines the stratigraphic framework of the deep‐water system. From the base of the succession, two prominent channel complex sets have been recognized, namely CS1 and CS2, consisting of amalgamated incisional channel elements and weakly‐confined channel elements. These channelized units are overlain by isolated incisional channels, erosional into mud‐prone slope deposits. The juxtaposition of different channel architectures is interpreted to have been governed by regional thrust‐tectonics, in combination with a high subsidence rate that promoted significant aggradation. In this scenario, the alternating ‘in sequence’ and ‘out of sequence’ tectonic pulses of the basin‐bounding thrusts controlled the activation of coarse‐clastic inputs in the basin and the resulting stacking architectures of channelized units. The tectonically‐driven confinement of the depositional system limited the lateral offset in channel stacking, preventing large‐scale avulsions. This study represents an excellent opportunity to analyze the stratigraphic evolution of a submarine channel system in tectonically‐active settings from an outcrop perspective. It should find wide applicability in analogous depositional systems, whose stratigraphic architecture has been influenced by tectonically‐controlled lateral confinement and associated lateral tilting.

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Section: Discussionmentioning

confidence: 98%

Multi‐scale analysis of a migrating submarine channel system in a tectonically‐confined basin: The Miocene Gorgoglione Flysch Formation, southern Italy

et al. 2018

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“…Such variability can occur at the individual channel element, complex, and complex set scale (e.g. Pickering & Corregidor, 2005;Mayall et al, 2006;Pyles et al, 2010;Moody et al, 2012;Bayliss & Pickering, 2015;Zhang et al, 2015;Li et al, 2016). Despite this, a generalised facies association for the Klein Hangklip channel-fill is proposed.…”

Section: Fa1: Channel-fillmentioning

confidence: 99%

Stratigraphic hierarchy and three‐dimensional evolution of an exhumed submarine slope channel system

et al. 2020

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Submarine slope channel systems have complicated three‐dimensional geometries and facies distributions, which are challenging to resolve using subsurface data. Outcrop analogues can provide sub‐seismic‐scale detail, although most exhumed systems only afford two‐dimensional constraints on the depositional architecture. A rare example of an accessible fine‐grained slope channel complex set situated in a tectonically quiescent basin that offers seismic‐scale, down‐dip and across‐strike exposures is the Klein Hangklip area, Tanqua‐Karoo Basin, South Africa. This study investigates the three‐dimensional architecture of this channel complex set to characterise the stratigraphic evolution of a submarine channel‐fill and the implications this has for both sediment transport to the deep‐oceans and reservoir quality distribution. Correlated sedimentary logs and mapping of key surfaces across a 3 km2 area reveal that: (i) the oldest channel elements in channel complexes infill relatively deep channel cuts and have low aspect‐ratios. Later channel elements are bound by comparatively flat erosion surfaces and have high aspect‐ratios; (ii) facies changes across depositional strike are consistent and predictable; conversely, facies change in successive down depositional dip positions indicating longitudinal variability in depositional processes; (iii) stratigraphic architecture is consistent and predictable at seismic‐scale both down‐dip and across‐strike in three‐dimensions; (iv) channel‐base‐deposits exhibit spatial heterogeneity on one to hundreds of metres length‐scales, which can inhibit accurate recognition and interpretations drawn from one‐dimensional or limited two‐dimensional datasets; and (v) channel‐base‐deposit character is linked to sediment bypass magnitude and longevity, which suggests that time‐partitioning is biased towards conduit excavation and maintenance rather than the fill‐phase. The data provide insights into the stratigraphic evolution and architecture of slope channel‐fills on fine‐grained continental margins and can be utilised to improve predictions derived from lower resolution and one‐dimensional well data.

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“…The Aínsa Basin fill predominantly consists of submarine slope channel systems and mass-transport deposits, separated by marlstones (e.g. Mutti, 1977;Clark et al, 1992;Mutti, 1992;Clark and Pickering, 1996;Pickering and Corregidor, 2005;Moody et al, 2012;Dakin et al, 2013;Bayliss and Pickering, 2015).…”

Section: Geological Settingmentioning

confidence: 99%

Spatial variability in depositional reservoir quality of deep-water channel-fill and lobe deposits

Bell

Kane

Pontén

et al. 2018

Marine and Petroleum Geology

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Deep-marine structurally confined channelised sandy fans: Middle Eocene Morillo System, Ainsa Basin, Spanish Pyrenees

Cited by 26 publications

References 60 publications

Multi‐scale analysis of a migrating submarine channel system in a tectonically‐confined basin: The Miocene Gorgoglione Flysch Formation, southern Italy

Multi‐scale analysis of a migrating submarine channel system in a tectonically‐confined basin: The Miocene Gorgoglione Flysch Formation, southern Italy

Stratigraphic hierarchy and three‐dimensional evolution of an exhumed submarine slope channel system

Spatial variability in depositional reservoir quality of deep-water channel-fill and lobe deposits

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