Product catalogue
Trace element systematics of magnetite from the Starra iron oxide‑copper gold deposits reveals early fluid conditions characteristic for Cu mineralization
Hydrothermal magnetite from the Starra iron oxide‑copper gold (IOCG) deposit in northwest Queensland, Australia, records a gradual decrease in V, Ni, Cr, and Mn that correlates with the transition from early, amphibole-biotite-magnetite dominant alteration to late, chlorite-quartz-hematite-dominated alteration assemblages. The observed systematic change in multivariate elements in magnetite is interpreted to indicate an increase in fO2 during the main Cu(Au) mineralization. We suggest that variations in the V, Ni, and Cr contents of magnetite at Starra indicate either a primary magmatic fluid source or the leaching of mafic rocks by fluids during early albitization. Late silician magnetite contained in ankerite veins that crosscut the pre-existing alteration assemblages in the hanging wall to the Starra 222 ore body is likely the result of a second mineralization phase, which contributed additional metals to the Starra ore bodies.
Existing data on magnetite chemistry from several IOA, IOCG, Fe, and Fe-W skarn deposits show that the ratio of V to Ga discriminates the various ore types effectively. Skarn deposits are separated from IOA and IOCG by lower concentrations of V, Ni, and Cr, suggesting a more primitive fluid source or the precipitation of magnetite at distinct physicochemical conditions than IOA and IOCG deposits. Magnetite from IOA deposits exhibits a consistently elevated V concentration whereas magnetite from Fe(–– W) skarn records an increase in V concentration with the evolution of the system. A pronounced decrease in the V contents of magnetite associated with Cu Au mineralization at Starra is interpreted as a change in redox conditions from reduced to oxidized at the time of mineralization. Such variations are also observed in other IOCG deposits. We propose that systematic decreases in V concentration in magnetite during the paragenetic evolution of the host mineral system is a diagnostic indicator for Cu(Au) mineralization in IOCG deposits, and as such, it may be used as a proxy for Cu-Au exploration, if the paragenetic context of magnetite is well constrained.
<b>Citation:</b> Max Hohl, Jeffrey A. Steadman, Jonathan Cloutier, Shaun L.L. Barker, Ivan Belousov, Karsten Goemann, David R. Cooke, Trace element systematics of magnetite from the Starra iron oxide‑copper gold deposits reveals early fluid conditions characteristic for Cu mineralization, <i>Chemical Geology</i>, Volume 648, 2024, 121960, ISSN 0009-2541, https://doi.org/10.1016/j.chemgeo.2024.121960
Simple
Identification info
- Date (Creation)
- 2024-03-02T09:00:00
- Date (Publication)
- 2024-09-03T02:48:20
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/149303
- Cited responsible party
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Role Organisation / Individual Name Details Author Hohl, M.
External Contact Author Steadman, J.A.
External Contact Author Cloutier, J.
Internal Contact Author Barker, S.L.L.
External Contact Author Belousova, I.
External Contact Author Goemann, K.
External Contact Author Cooke, D.R.
External Contact Publisher Elsevier B.V.
External Contact
- Name
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Chemical Geology
- Issue identification
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Volume 648, 20 March 2024
- Page
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121960
- Purpose
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The study is part of Max Hohl PhD and focuses on the Starra IOCG deposits. It aims at identifying key proccesses that formed the deposits using pyrite mineral chemistry and isotopic signature.
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Resource provider Minerals, Energy and Groundwater Division
External Contact Point of contact Cloutier, J.
Internal Contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- Not planned
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- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Project
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CODES
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- Project
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University of Tasmania
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- Keywords
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Starra
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- Keywords
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iron oxide copper gold - IOGG
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- Keywords
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pyrite
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- Keywords
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mineral chemistry
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- Keywords
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sulfur isotope
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- theme.ANZRC Fields of Research.rdf
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Inorganic Geochemistry
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Isotope Geochemistry
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GEOLOGY
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
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Role Organisation / Individual Name Details User Any
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© 2024 The Authors
Resource constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Classification system
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Australian Government Security Classification System
- Language
- English
- Character encoding
- UTF8
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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- OnLine resource
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Link to Journal
Link to Journal
- Distribution format
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Resource lineage
- Statement
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<div>Samples used in the study were collected with the approval of Chinova Resources. The data from this manuscript are from the CODES LA ablation facility and the S isotopes were collected at the Centre for Microscopy, Characterization and Analysis (CMCA) at the University of Western Australia.</div>
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/281ca5e6-1c6a-40d3-b0aa-6ccda66eec14
- Title
-
GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Cloutier, J.
Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Journal Article / Conference Paper
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/149303
- Date info (Creation)
- 2024-09-03T02:36:19
- Date info (Revision)
- 2024-09-03T02:36:19
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- http://pid.geoscience.gov.au/dataset/ga/122551