Product catalogue
The geology and mineral resources of the Brock's Creek District, Northern Territory
This Bulletin presents an account of the general geology, stratigraphy, structure, and mineral resources of the Brock's Creek district, Northern Territory. The general geological mapping of the district was carried out by the Aerial, Geological, and Geophysical Survey of Northern Australia in 1939, and a brief account of the results then obtained has been published (A.G.G.S.N.A., 1939). Some further mapping was carried out in 1950. The most important sedimentary rocks of the district are believed to be of Lower Proterozoic age and have been called the Brocks Creek Group (Noakes, 1949). They are dominantly argillaceous in type, but contain sandy formations as well as thin beds of conglomerate and limestone. Numerous sills of amphibolite, which are of igneous origin, are found within the sedimentary sequence. The sediments and interrelated amphibolites probably attain a thickness of 18,000 feet. Unconformably overlying the Brock's Creek Group is a comparatively thin formation of quartzite which is probably late Proterozoic, in age and is known as the Ruldiva Quartzite. Horizontally bedded Lower Cretaceous sandstone and shale up to 200 feet, thick is found capping mesas ill the district. In the north-eastern section of the area mapped is a concordant body of granite (Brock's Creek Granite), roughly circular in shape at the surface, and haying an average diameter of approximately six miles. A smaller area of concordant granite occurs near Mt. Shoobridge in the south-western portion of the area mapped. A discordant cross-cutting granite (Margaret Granite) cuts through the Brock's Creek sediments in the south-eastern portion of the district and exends for many miles to the south. The Buldiva Quartzite is only gently folded and is not intruded by igneous rocks, but the Brocks Creek Group has been subjected to considerable folding and faulting. The fold axes trend north-westerly or northerly, and marked cleavage has been produced parallel to the fold axes. The fine-grained sediments have been converted into schist in many places. Comparatively broad domal and basin-shape1 folds dominate the general structure of the district, but some anticlinal folds have been comparatively tightly compressed---e.g., the Howley Anticline. Within the 300 square miles of country mapped, it was found that deposits of gold and copper occur within, or close to, one formation, which may be repeated from place to place by folding and faulting. The favourable formation is a graphitic slate but is closely associated with a thin band of conglomerate and is normally associated also with sills of amphibolite. A limestone commonly occurs above or below the graphitic slate, but is lenticular in habit. Ore is commonly found in domal and anticlinal structures within these beds, especially near the more crenulated portions of the structure.
Simple
Identification info
- Date (Publication)
- 1952-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/215
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Bureau of Mineral Resources, Geology and Geophysics
Canberra Author Sullivan, C.J.
1 Author Iten, K.W.B.
2
- Name
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Bulletin
- Issue identification
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012
- 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
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- Geoscientific information
Extent
))
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- Unknown
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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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Bulletin
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- Theme
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geology
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- Theme
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mineral deposits
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- Keywords
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AU-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
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
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- Language
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Distribution Information
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
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Download the Bulletin (pdf)
Download the Bulletin (pdf)
- Distribution format
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pdf
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Resource lineage
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Unknown
- Hierarchy level
- Non geographic dataset
- Other
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GA Publication
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Source data not available.
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
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- 2018-11-01T00:00:00
- Classification
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Metadata
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urn:uuid/a05f7892-9d0f-7506-e044-00144fdd4fa6
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GeoNetwork UUID
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
Type of resource
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Legacy AGSO BMR Bulletins
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/215
- Date info (Revision)
- 2018-04-20T06:09:28
- Date info (Creation)
- 1996-10-29T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
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ISO 19115-1:2014
Metadata standard
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ISO 19115-3
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
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Version 2.0, September 2018
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