Authors / CoAuthors
Meixner, A.J. | Vandenberg, L. | Milligan, P. | Larson, R. | Hay, R.J.
Abstract
This Tanami Region preliminary three dimensional model has been constructed from themes compiled from a variety of sources and assembled within a GOCAD software application. The display medium for web delivery has used the Virtual Reality Modelling Language (VRML) format. Layers of data were principally supplied by Geoscience Australia apart from a combined image of the Tanami and The Granites 1:250000 scale interpreted maps, surface fault traces, and mineral occurrence point data, which were obtained from the Northern Territory Geological Survey. The geophysical images and gravity "worms" were sourced from grids modelled by Geoscience Australia geophysicists. The cross-sections were geophysically modelled using ModelVision software and imported into GOCAD. Surfaces were modelled in GOCAD using cross-section data and surface constraints.
Product Type
dataset
eCat Id
47396
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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- geoscience
- ( Theme )
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- geophysics
- ( Theme )
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- geology
- ( Theme )
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- structural geology
- ( Theme )
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- mapping
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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
2003-01-01T00:00:00
Creation Date
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Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
All layers have been projected into a universal transverse mercator projection in zone 52, on the geodetic datum of Australia. Digital Elevation Model. Pseudocolour image of the Digital Elevation Model (DEM) based on the Geoscience Australia 9-second DEM (2nd edition). The surface has been created in GOCAD. Solid Geology. Image combining the 1:250000 sheets of Tanami and The Granites, Northern Territory Geological Survey 1st edition 2000 integrated geological-geophysical interpretations. Colour Bouguer gravity. Pseudocolour image of the Bouguer Gravity field using values extracted from the Australian National Gravity Database. Magnetics (col). Reduced to the pole (RTP) pseudocolour image, with a northeasterly illumination, of the total magnetic intensity (TMI) processed by Geoscience Australia. A seamless grid was produced by merging a number of individual airborne magnetic surveys. Magnetics (grey). Greyscale image of the first vertical derivative applied to the total magnetic intensity, reduced to pole. Gravity VD1. Greyscale image of the Horizontal Gradient (HG) applied to the Bouguer Gravity field. The HG process was applied to the total magnetic intensity data after reduction to the pole and upward continued to 2000 metres. Archaean. These lines were selected from 1:250000 maps within the project area mapped as surface rock bodies of Archaean age. Palaeoprot cover. Lines selected from 1:250000 maps within the project area mapped as surface rock bodies of Palaeoproterozoic age. Units from the Birrindudu Group, Redcliff Pound Group, Albert Edward Group and Duerdin Group have been selected as geological cover sequences. Palaeoprot basement. Lines selected from 1:250000 maps within the project area mapped as 'basement' rock bodies of Palaeoproterozoic age. This layer excludes Palaeoproterozoic rock units considered to be cover sequences. Modelled GOCAD surfaces: Granite. This is a surface for the Frankenia Dome, constraints from surface interpretation and modelled geophysical cross-sections. Fault 1 east. Tanami Fault, constraints from surface interpretation and modelled geophysical cross-sections. Fault 1 west. Tanami Fault, constraints from surface interpretation and modelled geophysical cross-sections. Fault 2a. Mongrel Fault, constraints from surface interpretation and modelled geophysical cross-sections. Fault 2b. Frankenia Fault (system), constraints from surface interpretation and modelled geophysical cross-sections. Fault 3a. Bluebush Fault (system), constraints from surface interpretation and modelled geophysical cross-sections. Fault 3s. Bluebush Fault (system), constraints from surface interpretation and modelled geophysical cross-sections. Fault traces. Digital data compiled from interpretation of surface traces for faults mapped on the Tanami and The Granites 1:250000 sheets. Deposits. Mineral locations extracted from the Northern Territory Geological Survey MODAT database. Shrimp. Geochronology locations of U-Pb dating from the Geoscience Australia database of Sensitive High Resolution Scanning Ion Microprobe pooled age analyses. Gravity worms: The 'gravity worms' represent the points of maximum horizontal gradient of the Bouguer Gravity field, for may levels of upward continuation, in the case, generated for the 200, 500, 1000, 2000, 4000, 8000, and 12000 metre levels. Worms emphasise density contrasts and help to locate the edges of source bodies. 2D cross-sections. Cross-sections were modelled within the ModelVision software package. The bodies in these cross-sections represent density and magnetic susceptibility distributions modelled to fit the observed gravity and magnetic data. The linework was digitised in ArcInfo from images generated out of ModelVision, and imported into GODAD in DXF format. The colour images of the cross-sections are also presented. These have been registered to frames generated in GOCAD and set at average DEM heights for each cross-section in the VRML.
Parent Information
Extents
[-21.75768, -18.77916, 128.55386, 132.0081]
Reference System
Spatial Resolution
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