Magnetic susceptibility of Edmund Basin, Capricorn Orogen, WA

Heta Lampinen; Sandra Occhipinti; Mark Lindsay; Carsten Laukamp

doi:10.1071/ASEG2016ab254

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa Magnetic susceptibility of Edmund Basin, Capricorn Orogen, WA
Authors Heta Lampinen^a, Sandra Occhipinti^b, Mark Lindsay^c and Carsten Laukamp^d
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^a UWA, CET 35 Stirling Highway Crawley, WA, 6009, Australia, [email protected] ^b UWA, CET 35 Stirling Highway Crawley, WA, 6009, Australia, [email protected] ^c UWA,CET 35 Stirling Highway Crawley, WA, 6009, Australia, [email protected] ^d CSIRO 26 Dick Perry Avenue Kensington, WA, 6152, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 8
DOI: https://doi.org/10.1071/ASEG2016ab254
- Published online: 01 Dec 2016

Abstract

Magnetic anomalies appear to be related to base metal prospects in the Mesoproterozoic Edmund Basin of the Western Australian Capricorn Orogen, one of them being the cause of finding the Abra Pb-Cu-Zn deposit. Our results from Edmund and Collier lithostratigraphic units show that magnetic susceptibility of the older dolerites is less than that of the younger, and that weathering appears to decrease the magnetic susceptibility response at outcrops. Sedimentary rocks and Moorarie Supersuite monzogranite have lower magnetic susceptibility than the mafic intrusive rocks. Hydrothermal quartz and diorite related to Moorarie Supersuite have high susceptibility and either of these or both may relate to magnetic highs at locations of outcropping or nearly outcropping basement rocks. Hydrothermal alteration seems linked to higher susceptibilities, but additional sampling from fresh unaltered rock and hydrothermal alteration as well as petrographic studies to define the magnetic accessory minerals in Edmund and Collier Basin lithostratigraphic units are required to understand the link between unit mineralogy and magnetic properties.

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Article Type: Research Article

Keyword(s): Capricorn Orogen; Edmund basin; magnetic petrology; magnetic susceptibility

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