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  • 1
    Call number: 9/M 07.0421(472)
    In: Geological Society special publication : 472
    Type of Medium: Monograph available for loan
    Pages: viii, 372 Seiten , Illustrationen, Karten, Diagramme
    ISBN: 9781786203960
    Series Statement: Geological society special publications no. 472
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 33 (1986), S. 0 
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Determination of geographically dependent sedimentological variation (‘proximality’) in ancient flysch deposits formed an important part of early turbidite studies. Attempts to quantify this variation highlighted anomalies which were neatly resolved by application of vertical sequence analysis and the use of fan models. However, there are many turbidite formations, such as the Lower Cretaceous Cumberland Bay Formation (CBF) of South Georgia, which cannot be described in terms of existing fan models but show strong proximal to distal sedimentological changes. The CBF is a thick sequence of volcaniclastic sandstone turbidites deposited in a linear back-arc basin, principally by currents flowing WNW, parallel to the basin margin. Four lithofacies associations are recognized on the basis of sandstone/shale ratio. The two finergrained associations are constant in character across the CBF outcrop. In the coarse-grained associations there is a change in character WNW, down the palaeocurrent direction. This is brought out by decreasing sandstone bed thickness and percentage amalgamation, but these changes are not always marked or consistent. In contrast, the internal character of the sandstone beds changes strongly, with a marked proportional increase in Tb and Tc divisions within the bed downcurrent. The evidence suggests that the system was aggradational rather than progradational: tectonic control of the basin margins prevented major migration of the depositional system, and most areas remained in the same position relative to source through time. Comparison of the CBF with other turbidite formations suggests two end-member states which will produce radically different vertical sequences. Progradational systems will produce strong vertical facies changes, where beds deposited in distal environments are overlain by beds deposited in environments progressively nearer source, however there will be no lateral change in the character of any particular facies type. In contrast in aggradational systems the major sedimentological variation will be lateral rather than vertical.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2015-03-09
    Description: The North Sakhalin Basin in the western Sea of Okhotsk has been the main site of sedimentation from the Amur River since the Early Miocene. In this article, we present regional seismic reflection data and a Neogene-Recent sediment budget to constrain the evolution of the basin and its sedimentary fill, and consider the implications for sediment flux from the Amur River, in particular testing models of continental-scale Neogene drainage capture. The Amur-derived basin-fill history can be divided into five distinct stages: the first Amur-derived sediments (〉21-16.5 Ma) were deposited during a period of transtension along the Sakhalin-Hokkaido Shear Zone, with moderately high sediment flux to the basin (71 Mt year-1). The second stage sequence (16.5-10.4 Ma) was deposited following the cessation of transtension, and was characterised by a significant reduction in sediment flux (24 Mt year-1) and widespread retrogradation of deltaic sediments. The third (10.4-5.3 Ma) and fourth (5.3-2.5 Ma) stages were characterised by progradation of deltaic sediments and an associated increase in sediment flux (48-60 Mt year-1) to the basin. Significant uplift associated with regional transpression started during this time in southeastern Sakhalin, but the north-eastward propagating strain did not reach the NE shelf of Sakhalin until the Pleistocene (〈2.5 Ma). This uplift event, still ongoing today, resulted in recycling of older deltaic sediments from the island of Sakhalin, and contributed to a substantially increased total sediment flux to the adjacent basinal areas (165 Mt year-1). Adjusted rates to discount these local erosional products (117 Mt year-1) imply an Amur catchment-wide increase in denudation rates during the Late Pliocene-Pleistocene however, this was likely a result of global climatic and eustatic effects, combined with tectonic processes within the Amur catchment and possibly a smaller drainage capture event by the Sungari tributary, rather than continental-scale drainage capture involving the entire upper Amur catchment. © 2016 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists.
    Print ISSN: 0950-091X
    Electronic ISSN: 1365-2117
    Topics: Geosciences
    Published by Wiley
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