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dc.contributor.authorMcllroy, D.
dc.contributor.authorFlint, S.
dc.contributor.authorHowell, J.
dc.contributor.authorTimms, Nicholas Eric
dc.contributor.editorG. D. VEIGA
dc.contributor.editorL. A. SPALLETTI
dc.contributor.editorJ. A. HOWELL
dc.contributor.editorE. SCHWARZ
dc.identifier.citationMcllroy, 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.

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.

dc.publisherGeological Society of London
dc.subjecttidal depositional systems
dc.subjectJurassic Lajas Formation
dc.titleSedimentology of the tide-dominated Jurassic Lajas Formation, Neuquen Basin, Argentina
dc.typeBook Chapter
dcterms.source.titleThe Neuquen Basin, Argentina: A Case Study in Sequence Stratigraphy and Basin Dynamics (Geological Society, London, Special Publication Number 252)
dcterms.source.placeBath, UK
curtin.accessStatusFulltext not available
curtin.facultyDepartment of Applied Geology
curtin.facultyFaculty of Science and Engineering
curtin.facultyWA School of Mines

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