In situ mineral geochemistry as a guide to ore-forming processes
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Isotopic and trace element analyses are essential to our understanding ore-forming processes, but traditionally these techniques have required bulk digestion of rocks and minerals. Recent advances in in situ microanalytical techniques permit us to analyse samples on a mineral-by mineral basis and probe the chemistry of individual growth bands in minerals, providing a near-continuous record in any zoned mineral. This thesis is composed of five studies using the in situ geochemistry of 'gangue'...[Show more]
dc.contributor.author | Tanner, Dominique | |
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dc.date.accessioned | 2017-09-01T03:21:15Z | |
dc.date.available | 2017-09-01T03:21:15Z | |
dc.date.copyright | 2014 | |
dc.identifier.other | b3579072 | |
dc.identifier.uri | http://hdl.handle.net/1885/125140 | |
dc.description.abstract | Isotopic and trace element analyses are essential to our understanding ore-forming processes, but traditionally these techniques have required bulk digestion of rocks and minerals. Recent advances in in situ microanalytical techniques permit us to analyse samples on a mineral-by mineral basis and probe the chemistry of individual growth bands in minerals, providing a near-continuous record in any zoned mineral. This thesis is composed of five studies using the in situ geochemistry of 'gangue' (non-ore) minerals to elucidate cryptic ore-forming processes that are obscured using conventional analyses. The first half of this thesis presents coupled isotopic and trace element analyses in quartz and pyrite from magmatic-hydrothermal Cu-Au deposits. These studies revealed complex chemical zonation, providing a detailed record of cryptic fluid chemistry and depositional processes. A distinct isotopic signature and residual metastable silica hydrates in quartz microcrystals from the El Indio deposit, Chile provided the first evidence for silica maturation in a high-temperature environment and the first evidence for non-equilibrium isotope fractionation in quartz. The second half of this thesis focuses on the trace element chemistry of minerals from the Bellevue Core, a ~3 km drillcore intersecting the upper half of the Bushveld Complex, South Africa - the largest known repository of platinum-group elements (PGEs). These studies revealed a prospective PGE horizon and provide the first evidence for extensive equilibration of plagioclase in cumulate rocks. | |
dc.format.extent | 215 leaves | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Canberra, ACT : The Australian National University | |
dc.rights | Author retains copyright | |
dc.subject.lcsh | Ores | |
dc.subject.lcsh | Isotope geology | |
dc.subject.lcsh | Trace elements Analysis | |
dc.title | In situ mineral geochemistry as a guide to ore-forming processes | |
dc.type | Thesis (PhD) | |
local.contributor.institution | The Australian National University | |
local.contributor.supervisor | Mavrogenes, John | |
local.contributor.supervisorcontact | John.Mavrogenes@anu.edu.au | |
dcterms.valid | 2015 | |
local.description.notes | Thesis (Ph.D.)--Australian National University, 2014. | |
local.description.refereed | Yes | |
local.type.degree | Doctor of Philosophy (PhD) | |
dc.date.issued | 2014 | |
local.type.status | Accepted Version | |
local.contributor.affiliation | Australian National University. Research School of Earth Sciences | |
local.description.embargo | 2099-12-31 | |
local.request.email | repository.admin@anu.edu.au | |
local.request.name | Digital Theses | |
local.identifier.doi | 10.25911/5d5145998bce4 | |
dc.date.updated | 2017-08-30T21:16:57Z | |
dcterms.accessRights | Restricted access | |
dc.provenance | This thesis has been scanned and made available online through exception 200AB to the Copyright Act. | |
local.mintdoi | mint | |
Collections | Restricted Theses |
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File | Description | Size | Format | Image |
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b35790726_Tanner_D.pdf | 51.3 MB | Adobe PDF | ![]() Request a copy | |
Tanner_2013_Electronic_thesis_and_appendices.zip | 79.98 MB | Unknown | Request a copy |
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