Authors / CoAuthors
Meixner, A.J. | Vandenberg, L. | Beard, D.J. | Larson, R. | Nicoll, M.
Abstract
This third edition preliminary three dimensional model has been constructed from themes compiled from a variety of sources and assembled primarily within ESRI and GoCAD applications. The display medium for web delivery has used the Virtual Reality Modelling Language (VRML) format. Geophysical modelling was done by Geoscience Australia geophysicists using data stored by GA. Interpreted geology images of the Tanami and Arunta were provided by the Nothern Territory Geological Survey. Cross-sections were geophysically modelled using ModelVision, with geological interpretation provided by the NTGS and imported into GoCAD to build three dimensional fault surfaces. This edition of the model incorporates magnetic and gravity inversion surfaces and a depth to magnetic source layer.
Product Type
dataset
eCat Id
63544
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- GIS Dataset3D model
- ( Theme )
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- geology
- ( Theme )
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- geophysics
- ( Theme )
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- geoscience
- ( Theme )
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- mapping
- ( Theme )
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- structural geology
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- AU-NTAU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2005-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Special, MOU, etc.
Access - restricted
Use - license
Status
Purpose
Maintenance Information
annually
Topic Category
geoscientificInformation
Series Information
Lineage
The projection and datum used in the construction of all layers is MGA Zone 52, Geodetic Datum of Australia 1994. DEM: Pseudocolour image of the Geoscience Australia 9-second Digital Elevation Model (2nd edition). Landsat image: Landsat 7 bands 1, 2 3 acquired 2004 and processed by the Australian Centre for Remote Sensing (ACRES) unit within GA. Index Map: This is an image of the Tanami Gold Project area which shows the locations of modelled sections and the extents for various layers which comprise the model. Geology: There are two images provided by the Northern Territory Geological Survey, one for the preliminary 1st edition unpublished interpreted geological-geophysical map of the North Arunta, and one for the Tanami 1:250000 1st edition published interpreted geological-geophysical map. Geoscience Australia has provided the geophysical interpretation for the third image of the Western Australian portion of the model. Regolith: This image was generated in ESRI ArcView using data from the regolith study of the Tanami region, conducted by the Cooperative Research Centre for Landscape Evolution and Mineral Exploration (CRCLEME) in 1999-2000. Roads: The roads image was compiled from a variety of sources, including Northern Territory Geological Survey historical mapping, Geoscience Australia historical topographic data, and more recent Barrick Gold of Australia Ltd digital data. Outcrops: Palaeoproterozoic cover and Palaeoproterozoic basement outcrops were extracted as lines and polygons from Geoscience Australia's digital repository of 1:250000 historical maps within the model region. Major fault traces and fault surfaces: Fault traces were extracted as lines from the 1: 250000 digital interpreted map of the Tanami (NTGS) and the 1: 500000 digital map of the North Arunta (NTGS). Fault traces and cross-section fault data were used to create the fault surfaces in GoCAD. Deposits: This layer represents point locations of mineral occurrences acquired from the MODAT database (Northern Territory) and the WAMIN-MINEDEX databases (Western Australia), current to June 2004. Shrimp: This layer is derived from Geoscience Australia's Oracle OZCHRON database of pooled age Sensitive High-Resolution Ion Microprobe (SHRIMP) U-Pb analyses, linked to the Oracle database, to allow for data interrogation, current to June 2004. Cross-section images were derived from 2-D interactive processing of geological and geophysical data using ModelVision, with geological input from the NTGS and geophysical input from GA. Gravity and magnetic strings are shown as coloured lines at a number of levels (from upward continued first vertical derivative grids of geophysical data) relative to the topographic surface. Interpretation of the data was done by Tony Meixner of Geoscience Australia. The Inversion surfaces were generated from the results of 3D inversion of a gridded mesh of magnetic and gravity data. The inversions were conducted using University of British Columbia Geophysical Inversion Facility software by Tony Meixner of Geoscience Australia. The magnetic surfaces enclose regions within the mesh of high magnetic intensity, while the gravity surfaces enclose region of low density. The depth to basement layers consist of a point data set, a 3D surface and contours of the surface draped on the topography layer. The point data contains depths to computed Euler Deconvolution values as well as depths to forward modelled source bodies. The 3D surface was generated using the point data depths and the locations of outcropping basement as a polygon dataset, as constraints. Geophysical interpretation was done by Tony Meixner of Geoscience Australia. Lines representing the seismic acquisition program, which is currently being undertaken, were formulated after field reconaissance and stakeholder consultation in 2004. These were provided to the visualisation team as digital data by Bruce Goleby of Geoscience Australia.
Parent Information
Extents
[-21.83361, -18.501182, 127.67438, 131.14774]
Reference System
Spatial Resolution
Service Information
Associations
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Source data not available.