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    Sedimentology of the tide-dominated Jurassic Lajas Formation, Neuquen Basin, Argentina

    Access Status
    Fulltext not available
    Authors
    Mcllroy, D.
    Flint, S.
    Howell, J.
    Timms, Nicholas Eric
    Date
    2005
    Type
    Book Chapter
    
    Metadata
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    Citation
    Mcllroy, Duncan and Flint, Stephen and Howell, John and Timms, Nicholas. 2005. Sedimentology of the tide-dominated Jurassic Lajas Formation, Neuquen Basin, Argentina, in G. D. Veiga, L. A. Spalletti, J. A. Howell, E. Schwarz (ed), The Neuquen Basin, Argentina: A Case Study in Sequence Stratigraphy and Basin Dynamics (Geological Society, London, Special Publication Number 252). pp. 83-107. Bath, UK: Geological Society of London.
    Source Title
    The Neuquen Basin, Argentina: A Case Study in Sequence Stratigraphy and Basin Dynamics (Geological Society, London, Special Publication Number 252)
    DOI
    10.1144/GSL.SP.2005.252.01.05
    ISBN
    1-86239-190-4
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/6428
    Collection
    • Curtin Research Publications
    Abstract

    Tidal depositional systems are often interpreted as lowstand/transgressive estuarine deposits within sequences that are either wave or river dominated during highstand times. The Middle Jurassic Lajas Formation of the Neuquen Basin, Argentina, comprises 600 m of well-exposed tide-dominated facies deposited within four unconformity bounded sequences, spanning approximately 4.5 Ma. Facies associations include tide dominated deltas, sandy-heterolithic tidal channel fills and extensive progradational tidal-flat successions, which are locally cut by heterolithic tidal channel fills. Despite the narrow bathymetric depositional range and the complex facies variability, flooding surfaces can be defined and mapped along a 48 km-long outcrop belt. These flooding surfaces allow definition of three distinct types of parasequence that exhibit coarsening-upwards, finingupwards and coarsening- to fining-upwards motifs. Sequence boundaries are marked by widespread, but shallow, incision, and the juxtaposition of stacked fluvial/tidal channel fills on a variety of subtidal and intertidal facies. Unconventional grain-size changes at sequence boundaries can occur where basin ward facies shifts are marked by juxtaposition of heterolithic-argillaceous intertidal/supratidal mudflat deposits on subtidal sandflat facies. The maintenance of macrotidal conditions through complete base-level cycles is interpreted as being due to the structural topography inherited from rifting, causing the whole sub-basin to behave as a structurally controlled embayment.

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