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Overcoming Proterozoic quartzite sand-body miscorrelations: integrated sequence stratigraphy and SHRIMP U-Pb dating of the Surprise Creek Formation, Torpedo Creek and Warrina Park Quartzites, Mt Isa Inlier

Jackson, M.; Southgate, P; Black, Lance; Blake, P; Domagala, J

Description

In the western part of the Mt Isa Inlier one of the most obvious lithostratigraphic correlations is the Torpedo Creek Quartzite (Lawn Hill Platform) and the Warrina Park Quartzite (Leichhardt River Fault Trough). These two sand bodies form the basal lithostratigraphic unit of their respective groups - McNamara and Mt Isa - and crop out as easily mappable, prominent ridges of white quartzite. Correlation of these sand bodies forms the linchpins for lithostratigraphic subdivision in the region....[Show more]

dc.contributor.authorJackson, M.
dc.contributor.authorSouthgate, P
dc.contributor.authorBlack, Lance
dc.contributor.authorBlake, P
dc.contributor.authorDomagala, J
dc.date.accessioned2015-12-13T22:49:26Z
dc.identifier.issn0812-0099
dc.identifier.urihttp://hdl.handle.net/1885/80540
dc.description.abstractIn the western part of the Mt Isa Inlier one of the most obvious lithostratigraphic correlations is the Torpedo Creek Quartzite (Lawn Hill Platform) and the Warrina Park Quartzite (Leichhardt River Fault Trough). These two sand bodies form the basal lithostratigraphic unit of their respective groups - McNamara and Mt Isa - and crop out as easily mappable, prominent ridges of white quartzite. Correlation of these sand bodies forms the linchpins for lithostratigraphic subdivision in the region. To test this correlation a 2000 m-thick stratigraphic interval around these two quartzite units was analysed using two modern techniques. A sequence stratigraphic analysis, which included detailed surface gammaray logging, was undertaken at 20 measured sections over an area of about 18 000 km2 to identify and correlate important stratal surfaces. Complementary high precision U-Pb SHRIMP dating of tuffaceous intervals was also done to provide independent control for the resulting new subdivisions of the section. The sequence analysis and SHRIMP dating of these units and the underlying Surprise Creek Formation demonstrate major miscorrelations in the current lithostratigraphy. SHRIMP dating helps to define a major unconformity with up to 20 million years of missing rock record: rocks above the surface are around 1670-1660 Ma, whilst those below are around 1690 Ma. Although 1: 100 000 lithostratigraphic mapping enabled the recognition of an unconformity at the base of the Mt Isa and McNamara Groups, in the majority of cases this surface does not correlate with the major lithostratigraphic boundary with which it was associated. In consequence this unconformity and supersequence boundary remains unrecognised in most areas. The consequences of such miscorrelations are inadequate and inaccurate reconstructions of basin geometry and stratigraphic architecture, and have important economic implications when searching for stratabound base metals.
dc.publisherBlackwell Publishing Ltd
dc.sourceAustralian Journal of Earth Sciences
dc.subjectKeywords: sequence stratigraphy; Australasia; Australia; Eastern Hemisphere; Mount Isa; Queensland; World Basin analysis; Geochronology; Lithostratigraphy; Mt Isa Inlier; Palaeoproterozoic; Sequence stratigraphy; SHRIMP; Surprise Creek Formation; Torpedo Creek Quartzite; Warrina Park Quartzite
dc.titleOvercoming Proterozoic quartzite sand-body miscorrelations: integrated sequence stratigraphy and SHRIMP U-Pb dating of the Surprise Creek Formation, Torpedo Creek and Warrina Park Quartzites, Mt Isa Inlier
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume52
dc.date.issued2005
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationMigratedxPub8803
local.type.statusPublished Version
local.contributor.affiliationJackson, M., Geoscience Australia
local.contributor.affiliationSouthgate, P, Geoscience Australia
local.contributor.affiliationBlack, Lance, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBlake, P, QLD Department of Natural Resources and Mines
local.contributor.affiliationDomagala, J, QLD Department of Natural Resources and Mines
local.description.embargo2037-12-31
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage25
local.identifier.doi10.1080/08120090500039390
dc.date.updated2015-12-11T10:35:13Z
local.identifier.scopusID2-s2.0-22944436444
CollectionsANU Research Publications

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