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  • Blackwell Science Ltd  (2)
  • Newark :John Wiley & Sons, Incorporated,  (1)
  • 1
    Online Resource
    Online Resource
    Newark :John Wiley & Sons, Incorporated,
    Keywords: Geology, Stratigraphic. ; Marine sediments. ; Submarine geology. ; Turbidites. ; Turbidity currents. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (483 pages)
    Edition: 1st ed.
    ISBN: 9781444304480
    Series Statement: International Association of Sedimentologists Series ; v.68
    Language: English
    Note: Intro -- Deep-Water Turbidite Systems -- Contents -- Preface -- Deep-water turbidite systems: an introduction -- Processes: overview and commentary -- Modelling of turbidity currents on Navy Submarine Fan, California Continental Borderland -- A physical model for the transport and sorting of fine-grained sediment by turbidity currents -- The hydraulic interpretation of turbidites from their grain sizes and sedimentary structures -- Subaqueous liquefied and fluidized sediment flows and their deposits -- Flow regimes in debris flow -- Contained (reflected) turbidity currents from the Middle Ordovician Cloridorme Formation, Quebec, Canada: an alternative to the antidune hypothesis -- Reverse flow in turbidity currents: the role of internal solitons [abstract only] -- Measurements of density underflows from Walensee, Switzerland [abstract only] -- Debris flow (olistostromes) and slumping on a distal passive continental margin: the Palombini limestone-shale sequence of the northern Apennines [abstract only] -- Water escape structures in coarse-grained sediment flows and their deposits [abstract only] -- Facies characteristics: overview and commentary -- Turbiditic and non-turbiditic mudstone of Cretaceous flysch sections of the East Alps and other basins -- Distinguishing between fine-grained turbidites and contourites on the Nova Scotian deep-water margin -- Rhythms in deep sea, fine-grained turbidite and debris-flow sequences, Middle Ordovician, eastern Tennessee -- Distinctive thin-bedded turbidite facies and related depositional environments in the Eocene Hecho Group (south-central Pyrenees, Spain) -- Sedimentology of very thick calcarenite marlstone beds in a flysch succession, southwestern Pyrenees -- The Cambro-Ordovician Cap Enrage Formation, Quebec, Canada: conglomeratic deposits of a braided submarine channel with terraces. , Deep marine arc apron deposits and syndepositional magmatism in the Alisitos group at Punta Cono, Baja California, Mexico -- Use of clay fabric to distinguish turbiditic and hemipelagic siltstones and silts [abstract only] -- The Cretaceous Talme Yafe Formation: a contour current shaped sedimentary prism of calcareous detritus at the continental margin of the Arabian Craton [abstract only] -- Mass transport in European Cretaceous chalk -- fabric criteria for its recognition [abstract only] -- Middle and Late Quaternary depositional sequences and cycles in the eastern Mediterranean [abstract only] -- Texture and structure of resedimented conglomerates: examples from Ksiaz Formation (Famennian-Tournaisian), south-western Poland [abstract only] -- Water escape structures in the context of a depositional model of a mass flow dominated conglomeratic fan-delta (Abrioja Formation, Pliocene, Almeria Basin, SE Spain) [abstract only] -- Analytical study of turbidites, Otadai Formation, Boso Peninsula, Japan [abstract only] -- Detrital modes of recent deep-sea sands and their relation to tectonic setting: a first approximation [abstract only] -- Deep-water environments: overview and commentary -- Slope-apron systems -- Sedimentary facies of the Nova Scotian upper and middle continental slope, offshore eastern Canada -- Anatomy of a modern open-ocean carbonate slope: northern Little Bahama Bank -- Mesozoic carbonate rudites, megabreccias and associated deposits from central Greece -- Trench-slope channels from the New Zealand Jurassic: the Otekura Formation, Sandy Bay, South Otago [abstract only] -- Sedimentation during carbonate ramp-to-slope evolution in a tectonically active area: Bowland Basin (Dinantian), northern England [abstract only] -- The Rio Dell Formation: a Plio-Pleistocene basin slope deposit in Northern California [abstract only]. , Submarine fan systems -- Turbidite depositional patterns and flow characteristics, Navy Submarine Fan, California Borderland -- Submarine sedimentation on a developing Holocene fan delta -- Eocene fan delta-submarine deposition in the Wagwater Trough, east-central Jamaica -- Distributary channels, sand lobes, and mesotopography of Navy Submarine Fan, Californian Borderland, with applications to ancient fan sediments [abstract only] -- Morphology and Quaternary sedimentation of the Mozambique Fan and environs, southwestern Indian Ocean [abstract only] -- Sealers Bay submarine fan complex, Oligocene, southern New Zealand [abstract only] -- Triassic carbonate submarine fans along the Arabian platform margin, Sumeini Group, Oman [abstract only] -- A carbonate submarine fan in a fault-controlled basin of the Upper Jurassic, Betic Cordillera, southern Spain [abstract only] -- Basin plain systems -- Sedimentation in the Conway Trough, a deep near-shore marine basin at the junction of the Alpine transform and Hikurangi subduction plate boundary, New Zealand -- Depositional models for fine-grained sediment in the western Hellenic Trench, Eastern Mediterranean -- Proximal to distal sedimentological variation in a linear turbidite trough: implications for the fan model -- Deep-water fan-channel conglomerates of Late Cretaceous age, southern Chile [abstract only] -- The Hunghae Formation, SE Korea: Miocene debris aprons in a back-arc intraslope basin [abstract only] -- Index.
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  • 2
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Moroccan Turbidite System (MTS) on the north-west African margin extends 1500 km from the head of the Agadir Canyon to the Madeira Abyssal Plain, making it one of the longest turbidite systems in the world. The MTS consists of three interconnected deep-water basins, the Seine Abyssal Plain (SAP), the Agadir Basin and the Madeira Abyssal Plain (MAP), connected by a network of distributary channels. Excellent core control has enabled individual turbidites to be correlated between all three basins, giving a detailed insight into the turbidite depositional architecture of a system with multiple source areas and complex morphology. Large-volume (〉 100 km3) turbidites, sourced from the Morocco Shelf, show a relatively simple architecture in the Madeira and Seine Abyssal Plains. Sandy bases form distinct lobes or wedges that thin rapidly away from the basin margin and are overlain by ponded basin-wide muds. However, in the Agadir Basin, the turbidite fill is more complex owing to a combination of multiple source areas and large variations in turbidite volume. A single, very large turbidity current (200–300 km3 of sediment) deposited most of its sandy load within the Agadir Basin, but still had sufficient energy to carry most of the mud fraction 500 km further downslope to the MAP. Large turbidity currents (100–150 km3 of sediment) deposit most of their sand and mud fraction within the Agadir Basin, but also transport some of their load westwards to the MAP. Small turbidity currents (〈 35 km3 of sediment) are wholly confined within the Agadir Basin, and their deposits pinch out on the basin floor. Turbidity currents flowing beyond the Agadir Basin pass through a large distributary channel system. Individual turbidites correlated across this channel system show major variations in the mineralogy of the sand fraction, whereas the geochemistry and micropalaeontology of the mud fraction remain very similar. This is interpreted as evidence for separation of the flow, with a sand-rich, erosive, basal layer confined within the channel system, overlain by an unconfined layer of suspended mud. Large-volume turbidites within the MTS were deposited at oxygen isotope stage boundaries, during periods of rapid sea-level change and do not appear to be specifically connected to sea-level lowstands or highstands. This contrasts with the classic fan model, which suggests that most turbidites are deposited during lowstands of sea level. In addition, the three largest turbidites on the MAP were deposited during the largest fluctuations in sea level, suggesting a link between the volume of sediment input and the magnitude of sea-level change.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: An integrated geophysical and sedimentological investigation of the Selvage sediment-wave field has revealed that the sediment waves are formed beneath unconfined turbidity currents. The sediment waves occur on the lower continental rise and display wavelengths of up to 1 km and wave heights of up to 6 m. Wave sediments consist of interbedded turbidites and pelagic/hemipelagic marls and oozes. Nannofossil-based dating of the sediments indicates a bulk sedimentation rate of 2·4 cm 1000 years–1, and the waves are migrating upslope at a rate of 0·28 m 1000 years–1. Sediment provenance studies reveal that the turbidity currents maintaining the waves are largely sourced from volcanic islands to the south. Investigation of existing models for sediment-wave formation leads to the conclusion that the Selvage sediment waves form as giant antidunes. Simple numerical modelling reveals that turbidity currents crossing the wave field have internal Froude numbers of 0·5–1·9, which is very close to the antidune existence limits. Depositional flow velocities range from 〈6 to 125 cm–1. There is a rapid increase in wavelength and flow thickness in the upper 10 km of the wave field, which is unexpected, as the slope angle remains relatively constant. This anomaly is possibly linked to a topographic obstacle just upslope of the sediment waves. Flows passing over the obstacle may undergo a hydraulic jump at its boundary, leading to an increase in flow thickness. In the lower 15 km of the wave field, flow thickness decreases downslope by 60%, which is comparable with results obtained for other unconfined turbidity currents undergoing flow expansion.
    Type of Medium: Electronic Resource
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