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Open File Report 46

Reference geochemical data sets from the Mt Gibson orientation study, Western Australia

Smith, R.E., Wildman, J.E., Anand, R.R. and Perdrix, J.L.

Data sets from the Mt Gibson geochemical orientation study have been organized into reference groups based upon the regolith stratigraphy for the area. The data sets (with the numbers of samples making up each set in brackets) consist of soils (17 or, with gravelly red earths included, 31), colluvium (58), lateritic gravel (55), lateritic duricrust (112), mottled zone (13), and saprolite (25). In addition, some data are presented for calcretes, iron segregations, mineralized veins, and lag. The total number of samples included in this report is 296.

The main information required to support the geochemical data is presented in concise and accessible form. This includes maps of the surface regolith relationships, bedrock geology, and sample sites for each sample set, together with a regolith-landform model and a schematic diagram of the regolith stratigraphy. Listings of chemical analyses for each sample, grouped according to sample type, are included, and summary statistics are presented. Box plots show the distribution of levels for each element, or oxide, for units of the regolith stratigraphy. Histograms for colluvium, lateritic gravel, and lateritic duricrust are presented for each element and oxide. Separate maps showing the geochemical dispersion patterns for Au, Pb, As, and Bi in colluvium, lateritic gravel, and lateritic duricrust allow the sampling to be seen in terms of the shape of the geochemical dispersion anomaly. Scales used for maps in this report are common to a previous report (20R) which comprehensively discussed the regolith relationships at Mt Gibson. Correlation webs highlight relationships between some elements for several of the sample media and a Si-AI-Fe triangular diagram shows the main characteristics of laterite samples.

The use of standardised formats for data presentation allow the characteristics of each data set to be appreciated, and comparisons to be made between the data sets. Furthermore, the Mt Gibson data can then be readily compared with data sets, as they arise, whether from other orientation studies, or from company exploration data. A floppy disk of the geochemical data together with sample type and location is included in standard format to enable users to have easy access and readily manipulate the data for their required purposes. Data sets, such as those presented, which are controlled within a regolith-landform framework, are being generated from other orientation studies within the Laterite Geochemistry Project. Collectively, these reference data sets will form an essential part of a growing interpretational data system.

Last updated: Thursday, January 06, 2000 08:42 AM


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