Authors / CoAuthors
Grunsky, E. | de Caritat, P. | Mueller, U.
Abstract
Multi-element near-surface geochemistry from the National Geochemical Survey of Australia has been evaluated in the context of mapping the exposed to deeply buried major crustal blocks of the Australian continent. The major crustal blocks, derived from geophysical and geological data, reflect distinct tectonic domains comprised of igneous, metamorphic and sedimentary rock assemblages representing a time scale ranging from early Archean to recent Cenozoic. The geochemical data have been treated as compositional data to uniquely describe and characterize the geochemistry of the major crustal blocks across Australia according to the following workflow: imputation of missing/censored data, log-ratio transformation, multivariate statistical analysis, classification/allocation, and multivariate geospatial (minimum/maximum autocorrelation factor) analysis. Using cross validation techniques the uniqueness of each major crustal block has been quantified. The abilities to predict (1) the membership, or lack thereof, of a surface regolith sample to one, or none, of the major crustal blocks, and (2) the major crustal block at sites that have not been sampled are demonstrated. In conclusion, the surface regolith of the Australian continent contains a geochemical record of the original crustal block composition, despite secondary modifications due to physical transport and chemical weathering effects. <b>Citation:</b> E.C. Grunsky, P. de Caritat, U.A. Mueller, Using surface regolith geochemistry to map the major crustal blocks of the Australian continent, <i>Gondwana Research</i>, Volume 46, 2017, Pages 227-239, ISSN 1342-937X, https://doi.org/10.1016/j.gr.2017.02.011
Product Type
document
eCat Id
101600
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
- Contact instructions
- MEG
Resource provider
Keywords
- theme.ANZRC Fields of Research.rdf
-
- EARTH SCIENCES
- ( Project )
-
- National Geochemical Survey of Australia
- ( Discipline )
-
- compositional data
- ( Discipline )
-
- multivariate statistics
- ( Discipline )
-
- posterior probability
- ( Discipline )
-
- typicality
- ( Discipline )
-
- minimum/maximum autocorrelation factor analysis
- ( Discipline )
-
- major crustal boundaries
-
- Published_External
Publication Date
2023-10-25T23:55:23
Creation Date
2016-08-22T12:00:00
Security Constraints
Classification - unclassified
Legal Constraints
Status
completed
Purpose
Article for submission to Gondwana Research Journal
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Gondwana Research Volume 46, June 2017 227-239
Lineage
Article for submission to Gondwana Research Journal
Parent Information
Extents
[-44.00, -11.00, 113.00, 154.00]
Reference System
Spatial Resolution
Service Information
Associations
Source Information