Skip navigation
Skip navigation

In situ mineral geochemistry as a guide to ore-forming processes

Tanner, Dominique

Description

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.authorTanner, Dominique
dc.date.accessioned2017-09-01T03:21:15Z
dc.date.available2017-09-01T03:21:15Z
dc.date.copyright2014
dc.identifier.otherb3579072
dc.identifier.urihttp://hdl.handle.net/1885/125140
dc.description.abstractIsotopic 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.extent215 leaves
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherCanberra, ACT : The Australian National University
dc.rightsAuthor retains copyright
dc.subject.lcshOres
dc.subject.lcshIsotope geology
dc.subject.lcshTrace elements Analysis
dc.titleIn situ mineral geochemistry as a guide to ore-forming processes
dc.typeThesis (PhD)
local.contributor.institutionThe Australian National University
local.contributor.supervisorMavrogenes, John
local.contributor.supervisorcontactJohn.Mavrogenes@anu.edu.au
dcterms.valid2015
local.description.notesThesis (Ph.D.)--Australian National University, 2014.
local.description.refereedYes
local.type.degreeDoctor of Philosophy (PhD)
dc.date.issued2014
local.type.statusAccepted Version
local.contributor.affiliationAustralian National University. Research School of Earth Sciences
local.description.embargo2099-12-31
local.request.emailrepository.admin@anu.edu.au
local.request.nameDigital Theses
local.identifier.doi10.25911/5d5145998bce4
dc.date.updated2017-08-30T21:16:57Z
dcterms.accessRightsRestricted access
dc.provenanceThis thesis has been scanned and made available online through exception 200AB to the Copyright Act.
local.mintdoimint
CollectionsRestricted Theses

Download

File Description SizeFormat Image
b35790726_Tanner_D.pdf51.3 MBAdobe PDFThumbnail
    Request a copy
Tanner_2013_Electronic_thesis_and_appendices.zip79.98 MBUnknown    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator