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Geochemical mapping by unmixing alluvial sediments: An example from northern Australia

Geochemical mapping by unmixing alluvial sediments: An example from northern Australia

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.gexplo.2023.107174. This is version 3 of this Preprint.

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Authors

Alex George Lipp , Patrice de Caritat, Gareth G Roberts 

Abstract

Alluvial sediments have long been used in geochemical surveys as their compositions are assumed to be representative of areas upstream. Overbank and floodplain sediments, in particular, are increasingly used for regional to continental-scale geochemical mapping. However, during downstream transport, sediments from heterogeneous source regions are carried away from their source regions and mixed. Consequently, using alluvial sedimentary geochemical data to generate continuous geochemical maps remains challenging. In this study we demonstrate a technique that numerically unmixes alluvial sediments to make a geochemical map of their upstream cat...  more

DOI

https://doi.org/10.31223/X5ZM09

Subjects

Earth Sciences, Environmental Monitoring, Environmental Sciences, Geochemistry, Geomorphology, Natural Resource Economics, Sedimentology, Soil Science, Water Resource Management

Keywords

Geochemical Mapping, Catchment sediments, Inverse modelling, unmixing, Northern Australia, Geochemical Survey, National Geochemical Survey of Australia

Dates

Published: 2022-10-01 11:08

Last Updated: 2023-03-13 14:43

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License

CC BY Attribution 4.0 International