A Theoretical and Experimental Study of Climbing-Ripple Cross-Lamination, with a Field Application to the Uppsala Esker

Allen, J. R. L.

doi:10.2307/520787

Cited by 52 publications

(42 citation statements)

References 12 publications

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“…The cross-beds all have the same attitude (orientation) and, thus, indicate that the current followed a similar direction throughout deposition of this interval. The cross-beds typically appear as straight-crested, small-scale ripples and have a relatively high angle of repose that indicates good sedimentation rates with respect to ripple migration (Allan 1972). Because suevitic material is incorporated into the ripples, we suggest that the underlying impactite deposit was unconsolidated and, thus, easily reworked at the time of deposition of these sediments.…”

Section: Characteristics Of the Overlying Reworked Intervalmentioning

confidence: 98%

First petrographic results on impactites from the Yaxcopoil‐1 borehole, Chicxulub structure, Mexico

Tuchscherer¹,

Reimold²,

Koeberl³

et al. 2004

Meteorit & Planetary Scien

109

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Abstract-The ICDP Yaxcopoil-1 (Yax-1) borehole located 60 km south-southwest of the center of the Chicxulub impact structure intercepted an interval of allogenic impactites (depth of 795-895 m). Petrographic analysis of these impactites allows them to be differentiated into five units based on their textural and modal variations. Unit 1 (795-922 m) comprises an apparently reworked, poorly sorted and graded, fine-grained, clast-supported, melt fragment-bearing suevitic breccia. The interstitial material, similar to units 2 and 3, is permeated by numerous carbonate veinlets. Units 2 (823-846 m) and 3 (846-861 m) are groundmass-supported breccias that comprise green to variegated angular and fluidal melt particles. The groundmass of units 2 and 3 comprises predominantly fine-grained calcite, altered alkali element-, Ca-, and Si-rich cement, as well as occasional lithic fragments. Unit 4 (861-885 m) represents a massive, variably devitrified, and brecciated impact melt rock. The lowermost unit, unit 5 (885-895 m), comprises highly variable proportions of melt rock particles (MRP) and lithic fragments in a fine-grained, carbonate-dominated groundmass. This groundmass could represent either a secondary hydrothermal phase or a carbonate melt phase, or both. Units 1 and 5 contain well-preserved foraminifera fossils and a significantly higher proportion of carbonate clasts than the other units. All units show diagnostic shock deformation features in quartz and feldspar clasts. Our observations reveal that most felsic and all mafic MRP are altered. They register extensive K-metasomatism. In terms of emplacement, we suggest that units 1 to 3 represent fallout suevite from a collapsing impact plume, whereby unit 1 was subsequently reworked by resurging water. Unit 4 represents a coherent impact melt body, the formation of which involved a significant proportion of crystalline basement. Unit 5 is believed to represent an initial ejecta/ground-surge deposit.

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Section: Characteristics Of the Overlying Reworked Intervalmentioning

confidence: 98%

First petrographic results on impactites from the Yaxcopoil‐1 borehole, Chicxulub structure, Mexico

Tuchscherer¹,

Reimold²,

Koeberl³

et al. 2004

Meteorit & Planetary Scien

109

View full text Add to dashboard Cite

show abstract

“…According to Jopling and Walker (1968) and Allen (1973), the type of ripple 184 lamination produced depends upon the rate of fallout from suspension; the higher the volume of 185 fine grained material falling out of suspension, the lower the rate of stoss-side erosion, allowing a 186 higher angle of climb and more complete preservation of a lamina. Allen (1971aAllen ( , 1971b1973) noted 187 that climbing ripple lamination is significant as it preserves the only bedform that can be used to 188 determine the short-term rate of deposition. The highly aggradational nature of the sinusoidal 189 laminae within C3 indicates persistent high rates of deposition, which suggests that sediment gravity 190 flows were expanding and depositing rapidly (highly non-uniform, (Kneller 1995)).…”

Section: Significance Of Aggradational Bedforms 175mentioning

confidence: 99%

Sedimentology, Stratigraphic Architecture, and Depositional Context of Submarine Frontal-Lobe Complexes

Morris

Hodgson

Flint

et al. 2014

Journal of Sedimentary Research

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Frontal lobes develop during discrete periods of progradation in deep-water systems, 12 and commonly form on the lower slope to base-of-slope. In reflection seismic datasets, they are 13 identified as high amplitude reflectors that are cut as the feeder channel lengthens. Here, an 14 exhumed sand-prone succession (>80% sandstone) from Sub-unit C3 of the Permian Fort Brown 15Formation, Laingsburg depocenter, Karoo Basin, South Africa, is interpreted as a frontal lobe 16 complex, constrained by its sedimentology, geometry and stratigraphic context. Sub-unit C3 crops 17 out as a series of sand-prone wedges. Individual beds can be followed for up to 700 m as they thin, 18 fine and downlap onto the underlying mudstone. The downlap pattern, absence of major erosion 19 surfaces or truncation, and constant thickness of underlying units indicates that the wedges are non-20 erosive depositional bodies. Their low aspect ratio and mounded geometry contrasts markedly with 21 architecture of terminal lobes on the basin floor. Furthermore their sedimentology is dominated by 22 dm-scale sinusoidal stoss-side preserved bedforms with a range of low-high angle climbing ripple 23 laminated fine-grained sandstones. This indicates that the flows deposited their load rapidly close to, 24 and downstream from, an abrupt decrease in confinement. The sedimentology, stratigraphy, cross-25 sectional geometry and weakly confined setting of a sand-prone system from the Giza Field, Nile 26

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“…Les figures sédimentaires dans les dépôts fluvioglaciaires (surtout sableux) des eskers ont fait l'objet de plusieurs études particulières (par ex. Allen, 1971 ;Aario, 1972aAario, , 1972bSaunderson 1972Saunderson , 1975aSaunderson , 1975bSaunderson , 1976Saunderson , 1977aSaunderson , 1982aSaunderson et Jopling, 1980 ;Terwindt et Augustinus, 1985 ;Jensen, 1988).…”

Section: Granulométrieunclassified

Les eskers : essai de synthèse bibliographique

Levasseur¹

2007

gpq

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L'essai propose une revue de la littérature sur les eskers. On y expose les informations de base (définition, terminologie, dimensions, distribution et caractères sédimentologiques généraux, incluant granulomere, fabriques, paléocourants, déformations et composition pétrographique) avant de présenter un historique des théories sur l'origine de ces constructions (hypothèses sous-glaciaire, supra- et intraglaciaire, de marge glaciaire et autres). De plus, on examine les différents modèles de sédimentation des eskers (chenal subaérien, canalisation forcée, deltaïque) et quelques généralités sur leur formation (écoulement des eaux de fonte, stabilité des conduits sous-glaciaires, source des matériaux, diachronisme des constructions et longueur des tunnels). On discute enfin du développement des eskers associés aux glaciers d'aujourd'hui.This essay deals with the literature on eskers. Basic informations (definition, terminology, dimensions, distribution and general sedimentologic features, including granulometry, fabrics, paleocurrents, deformations and lithologie composition) are presented, then theories on the origin of these forms (subglacial hypothesis, super-glacial and englacial hypothesis, marginal hypothesis and others) are exposed. Moreover, the different depositional models of eskers (open channel, full-pipe flow, deltaic) and some other concepts on their formation (meltwater flow, subglacial tunnel stability in ice, sediment sources, diachronism of constructions and length of tunnels) are examined. Finally, the development of eskers in current glacial environments are considered.Der Essay gibt eine Obersicht iiber die Literatur zu den Eskers. Basisinformationen werden gegeben (Definition, Terminologie, Dimensionen, Verteilung und allgemeine sedimentologische Eigenschaften einschlieBlich Kornverteilung, Texturen, Palâostromungen, Verformungen und Gesteinszusammensetzung), bevor die Geschichte der Theorien zum Ursprung dieser Formen vorgestellt wird (subglaziale, supra- und intraglaziale Hypothèse, Eisrandhypothese und andere). AuRerdem werden die verschiedenen Modelle der Sedimentierung der Eskers (subaërialer Kanal, erzwungene Kanalisierung, deltafôrmig) und einige allgemeine Ausfuhrungen iiber ihre Bildung untersucht (SchmelzwasserfluB, Stabiiitàt der Tunnel, Herkunft des Materials, Diachronismus der Konstruktionen und Lange der Tunnel). Zuletzt wird die Entwicklung der Eskers in heutiger Gletscherumwelt diskutiert

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A Theoretical and Experimental Study of Climbing-Ripple Cross-Lamination, with a Field Application to the Uppsala Esker

Cited by 52 publications

References 12 publications

First petrographic results on impactites from the Yaxcopoil‐1 borehole, Chicxulub structure, Mexico

First petrographic results on impactites from the Yaxcopoil‐1 borehole, Chicxulub structure, Mexico

Sedimentology, Stratigraphic Architecture, and Depositional Context of Submarine Frontal-Lobe Complexes

Les eskers : essai de synthèse bibliographique

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