Authors / CoAuthors
Smith, E.R.
Abstract
Middalya in the Carnarvon Basin, Western Australia, during October 1955 by the Bureau of Mineral resources. The object of the survey was to assist in interpreting gravity results in the region. Prior to this survey the interpretation of the geology suggested that the deepest part of the Palaeozoic basin was in the Wandagee Hill area, but gravity results indicated that a basement ridge may exist in this same area. The seismic results indicate a sedimentary thickness of at least 17,000 ft between Wandagee Hill and Middalya and possibly 24,000 ft thickness to the east of Middalya. Although no useful information was obtained in the immediate vicinity of Wandagee Hill, extrapolation of results from farther east, suggests that the basement may be as shallow as 6000 ft just west of Wandagee Hill. This would confirm the interpretation of the gravity results at this location. The seismic cross-section shows that there may be a large elevation of the basement over a region about 20 miles west of Middalya between Shot-points 90 and 113. Although there is no direct evidence of this in the gravity results, it may be related to faulting, particularly a fault four miles east of Middalya that is indicated both by surface geology and by gravity results.
Product Type
dataset
eCat Id
76383
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Seismology and Seismic Exploration
- ( {1} )
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- HVC_144637
- ( {1} )
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- Seismic Data seismic survey
- ( Theme )
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- seismic reflection
- ( Theme )
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- petroleum exploration
- ( Theme )
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- geophysics
- ( {1} )
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- AU-WA
- ( {1} )
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- Published_External
Publication Date
1962-01-01T00:00:00
Creation Date
Security Constraints
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Status
Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Record
Lineage
During October 1955 a seismic party of the Bureau of Mineral Resources undertook field work in the Wandagee/Middalya area, 100 miles north-east of Carnarvon, Western Australia. Reflection profiling was carried out along the main road between Wandagee Hill and Middalya, and also east of Middalya. A detailed gravity traverse was made along this road in 1951, but it could not be interpreted consistently with the geology accepted at the time (Chamberlain, Dooley, and Vale ,1954). It was considered that a seismic reflection cross-section along the same traverse might help in interpreting the gravity results. Later geological data have enabled a possible reconciliation to be made between the gravity and geological interpretations.
Parent Information
Extents
[-24.0, -23.75, 114.25, 115.0]
Reference System
Spatial Resolution
Service Information
Associations
Source Information
Source data not available.