Characteristics and evolution of the Tertiary palaeovalleys in the northwest Gawler Craton, South Australia

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dc.contributor.authorHou, B.
dc.contributor.authorFrakes, L.
dc.contributor.authorAlley, N.
dc.contributor.authorClarke, J.
dc.date.issued2003
dc.description.abstractIntegrated geoscientific datasets have contributed to an understanding of the Tertiary palaeovalleys once draining the Gawler Craton. Systematic investigations of both the shape and depth of the channels are based on interpretations from field exposures, a compendium of geological and drilling data, computer modelling of ancient landscapes, topographic and evaluated digital elevation models, remote sensing imagery, magnetics, seismic, gravity, airborne and transient electromagnetics, and radiometrics. Physical property contrasts that exist between the channel sediments and the underlying bedrock, for example, can be differentiated by geophysical methods to locate the incised‐valley thalweg. Evidence from sedimentology is combined with evidence from other geological and geophysical characteristics to arrive at a general reconstruction of palaeovalley architecture and history. The palaeovalleys were originally incised into the weathered pre‐Tertiary landscape of mostly weathered basement, and Tertiary fluvial, lacustrine, estuarine and even marine sediments accumulated during the Eocene and Miocene. Marine influence extended at least 100 km up the palaeovalleys during at least three major transgressions in the Eocene and Miocene intervals. Major sedimentary phases occurred in the Paleocene to Early Eocene, Middle to Late Eocene, Oligocene to Early Miocene, and Middle Miocene to Early Pliocene times.
dc.description.statementofresponsibilityB. Hou, L. A. Frakes, N. F. Alley and J. D. A. Clarke
dc.identifier.citationAustralian Journal of Earth Sciences, 2003; 50(2):215-230
dc.identifier.doi10.1046/j.1440-0952.2003.00987.x
dc.identifier.issn0812-0099
dc.identifier.issn1440-0952
dc.identifier.urihttp://hdl.handle.net/2440/1683
dc.language.isoen
dc.publisherTaylor & Francis Ltd.
dc.rightsCopyright status unknown
dc.source.urihttps://doi.org/10.1046/j.1440-0952.2003.00987.x
dc.subjectestuary
dc.subjectEucla Basin
dc.subjectGawler Craton
dc.subjectpalaeovalley
dc.subjecttertiary
dc.titleCharacteristics and evolution of the Tertiary palaeovalleys in the northwest Gawler Craton, South Australia
dc.typeJournal article
pubs.publication-statusPublished

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