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Rock property data (densities and magnetic susceptibilities) for hand sample and drill core specimens in the Tanami region.Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2. Dataset citationANZLIC unique identifier: ANZCW0703008381 Title: Rock property data (densities and magnetic susceptibilities) for hand sample and drill core specimens in the Tanami region. CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: Density and magnetic susceptibility measurements were taken from 254 rock samples in the Tanami region to provide rock property constraints during modelling. Multiple measurements were taken for each rock type, in each geological package, in order to provide a statistically representative sample for each package. The samples covered a large geographically portion of the model area, to account for any regional variations in rock properties. Samples selected for measurement were confined to rocks of the Tanami basement and the Birrindudu Group platform cover. Three rock sample datasets were accessed and consist of: Bureau of Mineral Resources (BMR) drill core collected during reconnaissance mapping of the Tanami Region in the early seventies (Blake, 1974) in order to penetrate cover and sample basement rock; NTGS hands samples collected as part their Tanami region project; and NTGS drill core collected as part their Tanami region project. ANZLIC search words:
Spatial domain:
Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia Geographic extent polygon: 128 -18, 132 -18, 132 -22, 128 -22, 128 -18, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2004-06-01 Ending date: 2005-06-01 Dataset statusProgress: Complete Maintenance and update frequency: Not Planned Access
Access constraints: The data is available for download on the Geoscience Australia web page. Free Data DownloadData qualityLineage: Density and magnetic susceptibility measurements were taken from 254 rock samples in the Tanami region to provide rock property constraints during modelling. Multiple measurements were taken for each rock type, in each geological package, in order to provide a statistically representative sample for each package. The samples covered a large geographically portion of the model area, to account for any regional variations in rock properties. Samples selected for measurement were confined to rocks of the Tanami basement and the Birrindudu Group platform cover. Three rock sample datasets were accessed and consist of: Bureau of Mineral Resources (BMR) drill core collected during reconnaissance mapping of the Tanami Region in the early seventies (Blake, 1974) in order to penetrate cover and sample basement rock; NTGS hands samples collected as part their Tanami region project; and NTGS drill core collected as part their Tanami region project. Positional accuracy: Samples with 'BMR' entered in the well_name attribute were collected in the 1970's before the advent of GPS. The locations of these samples may have an inacuracy of up to 500 m. The remaining samples were located using GPS and are accurate to within 50 m or less. Attribute accuracy: The magnetic susceptibility measurements were taken using a Fugro GMS-2 susceptibility meter. Multiple measurements were taken for a single sample with various faces and orientations presented to the meter. The highest reading for each sample was recorded. The density and porosity measurements follow the method of Emerson (1990). The samples were weighed using an electronic balance. The samples were then emersed in water for a minimumum of two days, extracted from the water bath and weighed again. The saturated samples were then placed in a basket which was emersed in water, with the net mass sample in water recorded. Using Archimedes Principle and the above measurements, the dry bulk density, wet bulk density, grain density and the apparent porosity were calculated. The samples were assumed to be dry proir to measurement and were not subjected to additional drying in an oven. The BMR drill core samples have been under cover in the BMR/AGSO/GA rock store for over 30 years while the NTGS hand samples and drill core, have been stored in the NTGS rock store for a number of years in the hot and dry Alice Springs environment. Emerson, D. W. 1990. Notes on mass properties of rocks - density, porosity, permeability. Exploration Geophysics, 21, 209-216. Logical Consistency: The data is considered logically consistent. Completeness: The data is considered complete. Contact information
Metadata informationMetadata date: 2008-09-01 Additional metadataMetadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703008381.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703008381.xml Authors:Meixner, A. J. |
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