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Yorke Peninsula (Moonta Subdomain) online GISNote: 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: ANZCW0703004542 Title: Yorke Peninsula (Moonta Subdomain) online GIS CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: The Moonta Subdomain forms the southern part of the Olympic Cu-Au province on the eastern margin of the Gawler Craton, and underlies most of the Yorke Peninsula and Spencer Gulf. The subdomain basement comprises metasediments and metavolcanics of the Palaeoproterozoic Wallaroo Group (~1760-1740 Ma) which were deformed and metamorphosed to upper greenschist-amphibolite facies during the Kimban Orogeny (~1720 Ma). These rocks were further deformed and intruded by granitoids and minor mafic intrusions of the Hiltaba Suite between about 1600 Ma and 1575 Ma. The Moonta Subdomain basement is highly prospective for iron oxide-Cu-Au mineralisation associated with the Hiltaba magmatic event. However outcrop of these basement rocks is limited almost entirely to narrow coastal exposures. The majority of the prospective basement is concealed by up to 100 metres of Neoproterozoic to Quaternary sediments, and geological mapping of the basement is largely limited to interpretation of geophysics (airborne magnetics, gravity, AEM) and drilling. ANZLIC search words:
Spatial domain:
Geographic extent name: MAITLAND - WA-125 - 1:50 000 Map Series - Western Australia Geographic extent polygon: 136.757 -33.444, 138.187 -33.444, 138.187 -35.325, 136.757 -35.325, 136.757 -33.444, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2002-04-16 Ending date: Not Known Dataset statusProgress: Complete Maintenance and update frequency: Not Known Access
Access constraints: Licence required Free Data DownloadData qualityLineage: The geology dataset was compiled primarily from interpretation of airborne magnetic data and drill hole logging, along with gravity and minor AEM data. The magnetic data used for the interpretation was compiled by GA and PIRSA geophysicists from numerous regional government surveys and more detailed private company surveys. The TEISA magnetic dataset (flown 1999, 400 metre line spacing) comprised the bulk of the data over the land area of Yorke Peninsula. Drill hole data comprised logs from the PIRSA database, as well as logging by the author. The model of depth-to-basement was calculated using the ANUDEM topographic modelling algorithm and was based primarily on drill hole data and the mapped limits of basement outcrop. Depth-to-basement in the area of the Stansbury Basin (SE of the survey area) was based on previous modelling by SRK Consulting (available from PIRSA). No attempt has been made to smooth the depth-to-basement contours which have been computer-generated from the gridded model. The vector data was digitised and compiled using ArcInfo 8.0.2. Depth-to-basement data was gridded and contoured using the Topogrid module of ArcInfo 8.0.2 and the Spatial Analyst extension of Arcview 3.2. Geophysical and depth-to-basement images were exported as BIL files from ER Mapper 5.5. The locations of mines and prospects were derived from various geological published papers and unpublished exploration company reports. The locations and names of lodes and mines in the Moonta and Wallaroo mineral fields are primarily from the reports of Jack (1917) and Dickinson (1953). Prospect outlines primarily delineate the extent of exploration surveys and drilling programs by companies such as WMC, NBH, Amalg, CRAE, BHP, MIM, Uranerz, St Joe, Phelps Dodge and others. Positional accuracy: Data was interpreted and digitised at 1:100,000 scale (with a nominal digitising accuracy of 50 metres) for optimal presentation at 1:250,000 scale. The dataset is NOT designed to be used at scales more detailed than 1:100,000. Attribute accuracy: The geological units are defined primarily on geophysical character, with limited ground truthing from irregularly distributed drilling and outcrop. Unit names used are described in Conor (1995 - Moonta-Wallaroo region - An interpretation of the geology of the Maitland and Wallaroo 1:100 000 sheet areas, Mines and Energy South Australia Open File Envelope 8886) with modification by Zang (2002 - Late Palaeoproterozoic Wallaroo Group and early Mesoproterozoic mineralisation in the Moonta Subdomain, eastern Gawler Craton, SA. Department of Primary Industry and Resources South Australia. Report Book 2002/001). Linework (boundaries, faults etc) are classified according to the author's confidence in their interpretation. Faults are further classified according to their interpreted importance in the structural framework (major fault, minor fault, fracture/joint). Logical Consistency: Attribute data for geological layers comply to the GA Geoscience Data Dictionary version 2002.02 -(http://www.ga.gov.au/general/technotes/20011112_53.jsp). All lines, points and polygons in all layers are labelled and fully attributed. All care has been taken to ensure that all lines intersect at nodes (where applicable), no duplicate lines exist and all polygons are closed with no duplicate labels. Geological faults exist as dangling lines (overshoots) in polygon layers. Completeness: Data and basic descriptive attributes are complete (eg: MAG_SYMB for polygon data, and AGSO_CODE for line data). The geological interpretation is complete as at 16-APR-2002. The author reserves the right to make future ammendments in the light of new data or concepts. Contact information
Metadata informationMetadata date: 2013-03-08 Additional metadataMetadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703004542.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703004542.xml The Online GIS contains the following datasets (all datasets presented in GDA94 datum, MGA53 projection) Vector data: Magint - polygon and line coverage of basement geology interpretation interpreted primarily from airborne magnetics and drillhole data. Maglin - line coverage of structural lines (eg: folds, trends, lineaments) interpreted from airborne magnetics. Basdpt - line coverage of depth-to-basement contours Mines - polygon coverage of legacy mines, lodes and prospects Coast - coastline of Yorke Peninsula-Spencer Gulf region Raster data: Tmi_ne_sunangle.bil - Total magnetic intensity pseudocolour image with a north-east sunangle illumination Vd1.bil - TMI first vertical derivative greyscale image Gravity.bil - Bouguer gravity anomaly pseudocolour image Basdpt.bil - Depth-to-basement pseudocolur image Authors:Raymond, O.L. |
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