Authors / CoAuthors
van der Wielen, S.E. | Britt, A. | Bastrakov, E.N. | Cross, A. | Jaireth, S. | Le Gleuher, M. | Schofield, A. | Skirrow, R.G.
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.
Product Type
nonGeographicDataset
eCat Id
71025
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
-
- PowerPoint
- ( Theme )
-
- 3D model
- ( Theme )
-
- depositional mechanisms
- ( Theme )
-
- geoscience
-
- AU-SA
- Australian and New Zealand Standard Research Classification (ANZSRC)
-
- Earth Sciences
-
- Published_External
Publication Date
2010-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
unknown
Topic Category
geoscientificInformation
Series Information
Lineage
Unknown
Parent Information
Extents
[-31.0, -30.5, 139.5, 140.0]
Reference System
Spatial Resolution
Service Information
Associations
Source Information
Source data not available.