Eye and sheath folds in turbidite convolute lamination: Aberystwyth Grits Group, Wales

McClelland, H. L. O.; Woodcock, Nigel; Gladstone, Charlotte

doi:10.1016/j.jsg.2011.05.007

Cited by 25 publications

(24 citation statements)

References 12 publications

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“…In their study of convolute lamination, McClelland et al (2011) presented convincing evidence to relate the vergence of folds to palaeoflow recorded by the host turbidite. Similarly, Butler & Tavarnelli (2006) showed how small-scale structures found beneath a thick turbidite sandstone relate to erosional palaeoflow indicators at the base of this sandstone.…”

Section: Implications For Palaeoflowmentioning

confidence: 94%

“…Here we are concerned with convolute lamination that is asymmetric and shows upwardly varying amplitude (A in Fig. 1f), As McClelland et al (2011) pointed out, these structures formed during deposition (see Allen 1984) and the shear sense implied by the asymmetry and orientation of folded laminations may be related to palaeoflow determined from conventional sedimentary structures such as flutes, gutters and tool-marks.…”

Section: Candidate Syndepositional Shear Structuresmentioning

confidence: 99%

“…Hanmer & Passchier 1991) could lead to confusion when studying turbidite sections in orogenic belts. Likewise, convolute lamination is open to confusion with tectonic deformation structures (as noted by McClelland et al 2011). Identification of growth strata with these structures removes the ambiguity.…”

Section: Alternative Explanations and Potential Misinterpretationsmentioning

confidence: 99%

“…Bed-scale deformation can occur during the emplacement of turbidity currents, through shear exerted onto the syndepositional seabed (e.g. Collinson 1994;Clark & Stanbrook 2001;Butler & Tavarnelli 2006;Eggenhuisen et al 2010a;McClelland et al 2011;Baas et al 2014). Interpretations of similar deformation have been made for turbulent subaerial gravity flows such as powder snow avalanches (e.g.…”

mentioning

confidence: 99%

“…As McClelland et al (2011) pointed out, many synsedimentary structures can be misinterpreted as the products of subsequent tectonics where found in metasedimentary successions within mountain belts. Therefore understanding and recognizing these structures is important to those seeking to unravel orogenic structure.…”

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confidence: 99%

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Interpreting syndepositional sediment remobilization and deformation beneath submarine gravity flows; a kinematic boundary layer approach

Butler

Eggenhuisen

Haughton

et al. 2015

JGS

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Turbidite sandstones and related deposits commonly contain deformation structures and remobilized sediment that might have resulted from post-depositional modification such as downslope creep (e.g. slumping) or density-driven loading by overlying deposits. However, we consider that deformation can occur during the passage of turbidity currents that exerted shear stress on their substrates (whether entirely pre-existing strata, sediment deposited by earlier parts of the flow itself or some combination of these). Criteria are outlined here, to avoid confusion with products of other mechanisms (e.g. slumping or later tectonics), which establish the synchronicity between the passage of overriding flows and deformation of their substrates. This underpins a new analytical framework for tracking the relationship between deformation, deposition and the transit of the causal turbidity current, through the concept of kinematic boundary layers. Case study examples are drawn from outcrop (Miocene of New Zealand, and Apennines of Italy) and subsurface examples (Britannia Sandstone, Cretaceous, UK Continental Shelf). Example structures include asymmetric flame structures, convolute lamination, some debritic units and injection complexes, together with slurry and mixed slurry facies. These structures may provide insight into the rheology and dynamics of submarine flows and their substrates, and have implications for the development of subsurface turbidite reservoirs.

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Section: Implications For Palaeoflowmentioning

confidence: 94%

Section: Candidate Syndepositional Shear Structuresmentioning

confidence: 99%

Section: Alternative Explanations and Potential Misinterpretationsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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