ORCID Profile
0000-0002-6900-0872
Current Organisations
University of South Australia
,
University of Adelaide
,
Curtin University
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Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 2022
Publisher: MDPI AG
Date: 26-07-2021
DOI: 10.3390/MIN11080809
Abstract: The chemistry of hydrothermal monazite from the Carrapateena and Prominent Hill iron oxide-copper-gold (IOCG) deposits in the IOCG-rich Gawler Craton, South Australia, is used here to define geochemical criteria for IOCG exploration in the Gawler Craton as follows: Monazite associated with IOCG mineralisation: La + Ce 63 wt% (where La 22.5 wt% and Ce 37 wt%), Y and/or Th 1 wt% and Nd 12.5 wt% Intermediate composition monazite (between background and ore-related compositions): 45 wt% La + Ce 63 wt%, Y and/or Th 1 wt%. Intermediate monazite compositions preserving Nd 12.5 wt% are considered indicative of Carrapateena-style mineralisation Background compositions: La + Ce 45 wt% or Y or Th 1 wt%. Mineralisation-related monazite compositions are recognised within monazite hosted within cover sequence materials that directly overly IOCG mineralisation at Carrapateena. Similar observations have been made at Prominent Hill. Recognition of these signatures within cover sequence materials demonstrates that the geochemical signatures can survive processes of weathering, erosion, transport and redeposition into younger cover sequence materials that overlie older, mineralised basement rocks. The monazite geochemical signatures therefore have the potential to be dispersed within the cover sequence, effectively increasing the geochemical footprint of mineralisation.
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 08-2011
Publisher: American Geophysical Union (AGU)
Date: 05-2015
DOI: 10.1002/2014TC003706
Publisher: Elsevier BV
Date: 08-2020
Publisher: Informa UK Limited
Date: 25-10-2021
Publisher: Elsevier BV
Date: 2014
Publisher: Geological Society of America
Date: 27-02-2014
DOI: 10.1130/B30977.1
Publisher: Geological Society of America
Date: 22-12-2016
DOI: 10.1130/B31474.1
Publisher: MDPI AG
Date: 25-08-2021
DOI: 10.3390/MIN11090916
Abstract: Detrital zircon grains preserved within clasts and the matrix of a basal diamictite sequence directly overlying the Carrapateena IOCG deposit in the Gawler Craton, South Australia are shown here to preserve U–Pb ages and geochemical signatures that can be related to underlying mineralisation. The zircon geochemical signature is characterised by elevated heavy rare-earth element fractionation values (GdN/YbN ≥ 0.15) and high Eu ratios (Eu/Eu* ≥ 0.6). This geochemical signature has previously been recognised within zircon derived from within the Carrapateena orebody and can be used to distinguish zircon associated with IOCG mineralisation from background zircon preserved within stratigraphically equivalent regionally unaltered and altered s les. The results demonstrate that zircon chemistry is preserved through processes of weathering, erosion, transport, and incorporation into cover sequence materials and, therefore, may be dispersed within the cover sequence, effectively increasing the geochemical footprint of the IOCG mineralisation. The zircon geochemical criteria have potential to be applied to whole-rock geochemical data for the cover sequence diamictite in the Carrapateena area however, this requires understanding of the presence of minerals that may influence the HREE fractionation (GdN/YbN) and/or Eu/Eu* results (e.g., xenotime, feldspar).
Publisher: Elsevier BV
Date: 05-2013
Publisher: Springer Science and Business Media LLC
Date: 02-2018
Publisher: Geological Society of America
Date: 21-07-2020
DOI: 10.1130/G48017.1
Abstract: The geochemical analysis of trace elements in rutile (e.g., Pb, U, and Zr) is routinely used to extract information on the nature and timing of geological events. However, the mobility of trace elements can affect age and temperature determinations, with the controlling mechanisms for mobility still debated. To further this debate, we use laser-ablation–inductively coupled plasma–mass spectrometry and atom probe tomography to characterize the micro- to nanoscale distribution of trace elements in rutile sourced from the Capricorn orogen, Western Australia. At the & µm scale, there is no significant trace-element variation in single grains, and a concordant U-Pb crystallization age of 1872 ± 6 Ma (2σ) shows no evidence of isotopic disturbance. At the nanoscale, clusters as much as 20 nm in size and enriched in trace elements (Al, Cr, Pb, and V) are observed. The 207Pb/206Pb ratio of 0.176 ± 0.040 (2σ) obtained from clusters indicates that they formed after crystallization, potentially during regional metamorphism. We interpret the clusters to have formed by the entrapment of mobile trace elements in transient sites of radiation damage during upper hibolite facies metamorphism. The entrapment would affect the activation energy for volume diffusion of elements present in the cluster. The low number and density of clusters provides constraints on the time over which clusters formed, indicating that peak metamorphic temperatures are short-lived, & m.y. events. Our results indicate that the use of trace elements to estimate volume diffusion in rutile is more complex than assuming a homogeneous medium.
Publisher: Informa UK Limited
Date: 20-11-2019
Publisher: Springer Science and Business Media LLC
Date: 17-09-2014
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 04-2019
No related grants have been discovered for Diana Zivak.