Abstract

Australian Phanerozoic basins have been under-explored for uranium. As a result, Geoscience Australia has been conducting research into uranium systems in the Frome Embayment, with the aim of developing a series of models and exploration techniques to assist uranium exploration in other basins. The transport and depositional mechanisms are relatively well understood for sandstone-hosted uranium deposits; uranium is transported by oxidised meteoric fluids and precipitated by either an in situ reductant or by mixing with a reduced fluid. Using the concept that an oxidised fluid will progressively oxidise the rock that it passes through and, in turn the fluid will be reduced by wall rock interactions, potentially we can use drillhole logs to identify and map the redox state of the rocks and hence identify depositional sites. A pilot study was undertaken to determine whether the open file geological logs could be used to map the redox state. A list of oxidised and reduced keywords was identified from the logs. Logs were digitised and oxidised words were given a value of one and reduced words given a value of negative one. Where there was combination of oxidised and reduced words, zero was used to designate the intermediate redox state. Where redox state could not be determined from the logs, a null data value was used. The redox values were imported into gOcad and gridded using DSI and IDW for comparison purposes. The technique identified north-south trending features in the Namba Formation interpreted to be previously unmapped paleochannels. This technique of mapping redox conditions of sediments using open file drilling reports is able to be applied in other basin settings, assisting in the targeting of sandstone-hosted uranium systems.
Google map showing geographic bounding box with values North bound -30.5 East bound 140.0 West bound 139.5 South bound -31.0
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2010-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

71025 Product http://www.ga.gov.au/metadata-gateway/metadata/record/71025/

Keywords

PowerPoint
3D model
depositional mechanisms
geoscience
AU-SA
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-30.5
East bound
140.0
West bound
139.5
South bound
-31.0

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Source data not available.

Metadata File Identifier

a05f7892-f9d6-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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