Authors / CoAuthors
Bastrakova, I.V. | Whitaker, A.J.
Abstract
The Perth 1:1M sheet covers an area underlain by Archaean rocks of the western Yilgarn Craton, adjacent, abutting or onlapping Proterozoic rocks such as the Northampton Block, and Phanerozoic rocks of the Perth Basin. The aeromagnetic interpretation provides most information on the distribution of Archaean rocks as these rocks are generally moderately to highly magnetised with reasonable variation of magnetisation. Adjacent Perth Basin sediments are poorly magnetised and spatially associated magnetic anomalies are attributed to underlying Proterozoic rocks. The Archaean rocks are subdivided into undivided gneiss-migmatite-granite (Agmg), banded gneiss (Agn), sinuous gneiss (Anu), greenstone (Aa), and granite plutons (Ag). Where important relative differences in magnetisation are mapped, the geophysical map units include the suffixes _h (high), _m (medium), _l (low) and _r (remanent) for the level of magnetisation. Dykes, faults, and unassigned small intrusives are also mapped. Large Archaean domains equivalent to geologically defined Provinces are also defined including Murchison, Toodyay- Lake Grace, Southwest, Southern Cross and Yeelirrie domains.
Product Type
dataset
eCat Id
35525
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 DatasetRegional
- ( Theme )
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- GIS
- ( Theme )
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- magnetics
- ( Theme )
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- gravity
- ( Theme )
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- mineral deposits
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Geophysics
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- Published_Internal
Publication Date
2001-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
irregular
Topic Category
geoscientificInformation
Series Information
SH50
Lineage
The lines and polygons of the aeromagnetic interpretation were drawn on film overlaying images and contour plots at 1:250,000 scale. Images and contour plots of TMI were used for 1500 m line spaced data (most of the map sheets) while images only of TMI and 1st vertical derivative of TMI were used for 400 m / 200 m data coverage of the Youanmi, Barlee, and Jackson Sheets. The lines of the gravity interpretation were drawn on film overlaying contour plots of bouguer and residual bouguer gravity anomaly plotted at 1:1,000,000 scale. The film drawings were subsequently scanned, digitised on screen and attributed. The mineral deposits were selected from extracts of OZMIN and MINLOC databases while oil and gas wells were selected from extracts of PEDIN database.
Parent Information
Extents
[-32.0, -28.0, 114.0, 120.0]
Reference System
Spatial Resolution
Service Information
Associations
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Source Information
Source data not available.