Product catalogue
Gosses Bluff - a latest Jurassic impact structure, central Australia. Part 2: seismic, magnetic, and gravity studies
Geophysical studies of Gosses Bluff facilitate the resolution of its three-dimensional structure, which includes a broadly hemispherical low-velocity zone with a radius of about 4 km centred at the present ground level. This zone correlates with a deformed ring dominated by block-fauliing, megabreccia, and annular breccia troughs. Seismic data show a drop in shallow seismic velocities from 4.6 km s-1 over bedrock to 2.2 km s-1 over breccia outcrop. The base of the structure is defined by continuous reflectors at a maximum depth of 3450 m beneath the surface. The subsurface geology was deduced by fitting the extrapolated stratigraphy into the sequence of migrated seismic horizons. The uppermost little-disturbed reflectors are correlated with the tops of the Pertatataka Formation and Bitter Springs Formation of the Late Proterozoic--early Palaeozoic Amadeus Basin sequence. Seismic data for the Bitter Springs Formation define a domal structure and local thickening under Gosses Bluff. The gravity field associated with Gosses Bluff outlines a remarkably symmetrical circular gravity low of 440 µm s-2 with a radius of about 10.8 km. An annular gravity low bounded by steep gradients is associated with the central uplift. The outer limit of the near-surface gravity structure is nearly vertical. The symmetrical gravity features can be modelled by shallow density variations, and no net mass excess or deficiency is defined several thousand metres centrally under the bluff. Likewise, no gravity expression of a deep-seated Gardiner-Tyler anticline, suggested by the seismic reflection data, is apparent. Several anticlines around the bluff are shown by gravity to have low-density cores. Total magnetic intensity (TMI) contours suggest a depth to magnetic basement of about 10 km under the bluff. A negative anomaly of 4 nT occurs between the central ring and an outcrop of flow breccia at Mount Pyroclast. Similar short-wavelength airborne magnetic anomalies of shallow sources over the eastern, southern, and western flanks of the bluff within 6 km of the centre correspond to flow breccia. The anomaly sources represent both remanent primary components of magnetisation, and remagnetisation formed during cooling, as confirmed by ground magnetic surveys in the Mount Pyroclast area. The pole position is consistent with a lurassic-Cretaceous-boundary age.
Simple
Identification info
- Date (Publication)
- 1996-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81459
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Australian Geological Survey Organisation
Canberra Author Milton, D.J.
1 Author Barlow, B.C.
2 Author Brown, A.R.
3 Author Moss, F.J.
4 Author Manwaring, E.A.
5 Author Sedmik, E.C.E.
6 Author Young, J.A.
7 Author Van Son, J.
8
- Name
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AGSO Journal of Australian Geology and Geophysics
- Issue identification
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16:4:487-527
- Point of contact
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Role Organisation / Individual Name Details Custodian Corp
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
Voice
- Topic category
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- Geoscientific information
Extent
))
- Maintenance and update frequency
- Unknown
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Keywords
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GA Publication
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Journal
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- Keywords
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NT
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Journal article (pdf)
Journal article (pdf)
- Distribution format
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pdf
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Resource lineage
- Statement
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Unknown
- Hierarchy level
- Non geographic dataset
- Other
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GA Publication
- Description
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Source data not available.
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/fae9173a-7190-71e4-e044-00144fdd4fa6
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
Type of resource
- Resource scope
- Document
- Name
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AGSO BMR Journal
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/81459
- Date info (Revision)
- 2018-04-20T06:07:16
- Date info (Creation)
- 2014-06-03T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551