Authors / CoAuthors
Main, P.T. | Champion, D.C.
Abstract
Australia has a significant number of surface sediment geochemical surveys that have been undertaken by industry and government over the past 50 years. These surveys represent a vast investment and have up to now only been able to be used in isolation, independently from one another. The key to maximising the full potential of these data and the information they provide for mineral exploration, environmental management and agricultural purposes is using all the surveys together, seamlessly. These disparate geochemical surveys not only sampled various landscape elements and analysed a range of size fractions, but also used multiple analytical techniques, instrument types and laboratories. The geochemical data from these surveys require levelling to eliminate, as much as possible, non-geological variation. Using a variety of methodologies, including reanalysis of both international standards and small subsets of samples from previous surveys, we have created a seamless surface geochemical map for northern Australia, from nine surveys with 15,605 samples. We tested our approach using two surveys from the southern Thomson Orogen, which demonstrated the successful removal of inter-laboratory and other analytical variation. Creation of the new combined and levelled northern Australian dataset paves the way for the application of statistical and data analytics techniques, such as principal component analysis and machine learning, thereby maximising the value of these legacy data holdings. The methodology documented here can be applied to additional geochemical datasets as they become available.
Product Type
document
eCat Id
140055
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Resource provider
Keywords
- theme.ANZRC Fields of Research.rdf
-
- GEOCHEMISTRY
-
- EFTF
-
- Exploring For The Future
-
- North Australian Craton
-
- Geochemistry
-
- Levelled data
-
- Regolith
-
- Surface Sediment
-
- Geochemical Survey
-
- Published_External
Publication Date
2020-07-16T06:29:24
Creation Date
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
asNeeded
Topic Category
Series Information
Record RECORD 2020/017
Lineage
This data release includes data that has previously been released and subsequently modified, these are: • NGSA (https://pid.geoscience.gov.au/dataset/ga/82869) • NAGS (https://pid.geoscience.gov.au/dataset/ga/120116) • Hedleys creek (https://pid.geoscience.gov.au/dataset/ga/13739) • Seigal (https://pid.geoscience.gov.au/dataset/ga/13738) • Mammoth Mines (https://pid.geoscience.gov.au/dataset/ga/13899) • George Town (data can be found at https://portal.ga.gov.au/) • Cape York (data can be found at https://portal.ga.gov.au/) • GSWA - Balanggarra (http://dmpbookshop.eruditetechnologies.com.au/product/regolith-chemistry-of-the-balanggarra-area-north-kimberley-geographical-product-n14bczp.do]=) • GSWA - Bunuba and Yuriyangem-Taam (http://dmpbookshop.eruditetechnologies.com.au/product/regolith-chemistry-of-the-bunuba-and-yuriyangem-taam-areas-south-kimberley.do) • GSWA - Dambimangari (http://dmpbookshop.eruditetechnologies.com.au/product/regolith-chemistry-of-the-dambimangari-area-west-kimberley-geographical-product-n15af1zp.do) • GSQ - Cape York (https://qdexguest.dnrm.qld.gov.au/portal/site/qdex/search?REPORT_ID=99246). The data release document is an updated and modified version of the Exploring for the Future extended abstract (https://pid.geoscience.gov.au/dataset/ga/133667).
Parent Information
Extents
[-25.0062, -7.893, 114.7173, 154.5554]
Reference System
Spatial Resolution
Service Information
Associations
Source Information