|
|
|
You are here: Home > GA Metadata
|
||||
|
GA Metadata Related Links |
Harris Greenstone Belt 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: ANZCW0703004981 Title: Harris Greenstone Belt online GIS CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: The Harris Greenstone Domain (HGD) is a late Archaean-Proterozoic arcuate tectnostratigraphic terrane in the centre of the Gawler Craton. It is bound to the south by the Yerda Shear Zone and has a lithological zone boundary to the north with the Wilgena Domain. The basement comprises Archaean ultramafic-mafic extrusives (Lake Harris Komatiite), aluminous metasediments (Christie Gneiss), felsic extrusives and intrusives (Kenalla Gneiss), felsic intrusives (Glenroth Granite), and Proterozoic felsic intrusives (Hiltaba Suite Granite, St Peter Suite), felsic and mafic extrusives (Gawler Range Volcanics), and fluvial-marine sedimentary rocks (Tarcoola Formation, Pandurra Formation). The HGD is characterised by a series of sub-parallel east-northeast trending sinuous magnetic high features flanked by large ovoid to elongate magnetic highs and lows. The prominent narrow magnetic highs constitute the Archaean Harris Greenstone Belt (HGB). Rock types in this poorly exposed belt include komatiite, komatiitic basalt, tholeiitic basalt, and subordinate banded iron formation, metasediments, felsic volcanics, and pyroclastics metamorphosed to amphibolite facies during the Sleafordian Orogeny at ~2440 Ma. The Lake Harris Komatiite, which represents the most eastern occurrence of komatiite in Australia, has potential for Ni-Cu-PGE sulphide and lode-Au mineralising systems. The prospective greenstone sequence is covered by thin (<50 m) Quaternary sand and Eocene fluvial channel deposits. The distribution and structure of the greenstones is based largely on interpretation of aeromagnetics, gravity, and diamond drillcore. ANZLIC search words:
Spatial domain:
Geographic extent name: GAIRDNER - GAIRDNER - Drainage Divisions and Major River Basins - Australia Geographic extent polygon: 133.74 -30.546, 135.368 -30.546, 135.368 -31.274, 133.74 -31.274, 133.74 -30.546, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2002-08-22 Ending date: 2002-08-23 Dataset statusProgress: In Progress 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 vector data was digitised and compiled using ArcInfo 8.0.2. Geophysical and AEM images were exported as BIL files from ER Mapper 5.5. The BIL files were converted to geo-referenced TIF files in ArcInfo and then converted to a Mapserver compatible TIF via an Alchemy script. 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 http://www.ga.gov.au/rural/projects/gaw_harris_intro.html 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 2002.04 -(http://www.ga.gov.au/standards/datadict.html). 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 FEAT_CODE for line data). The geological interpretation is complete as at 23-AUG-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/ANZCW0703004981.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703004981.xml The Online GIS contains the following datasets (all datasets presented in GDA94 datum, MGA53 projection) Vector data: Magintp.shp - polygon shapefile of basement geology interpretation interpreted primarily from airborne magnetics and drillhole data. Magintl.shp - line shapefile of basement geology interpretation interpreted primarily from airborne magnetics and drillhole data. Maglin.shp - shapefile of structural lines (eg: folds, trends, lineaments) interpreted from airborne magnetics. Minloc.shp - point shapefile of mineral deposits from Geoscience Australia's OZMIN database Mer_dholes.shp - point coverage courtesy of MER (PIRSA) Raster data: ms_tmi_1vd.tif - Total magnetic intensity (TMI), first vertical derivative (VD1) pseudocolour image ms_tmi.tif - TMI, reduced to pole (RTP), pseudocolour image ms_tmi_vd1_grey.tif - TMI VD1 greyscale image ms_tmi_up1km.tif - TMI (RTP) upward continued 1 kilometre pseudocolour image ms_1vd_grav.tif - Bouguer gravity anomaly with VD1 intensity pseudocolour image ms_gravity.tif - Bouguer gravity anomaly pseudocolour image ms_aem_cond_log.tif - Airborne electromagnetic (AEM) conductance pseudocolour image ms_landsat_741.tif - Landsat thematic mapper (TM) bands 7, 4, and 1 colour image ms_dem.tif - Digital elevation model (DEM) pseudocolur image Authors:Hoatson, D. M. Peljo, M. Highet, L.M. |
|||
|
SPATIAL INFORMATION FOR THE NATION
|