Product catalogue
Origin of Archean Pb isotope variability through open-system Paleoarchean crustal anatexis
<div>Lead isotopic data implies that Th and U were fractionated from one another in Earth's early history, however, the origin of this fractionation is poorly understood. We report new <em>in-situ</em> Pb isotope data from orthoclase in 144 granites, sampled across the Archean Yilgarn Craton to characterize its Pb isotope variability and evolution. Granite Pb isotope compositions reveal three Pb sources, a mantle derived Pb reservoir and two crustal Pb reservoirs, distinguished by their implied source 232Th/238U (κPb). High-κPb granites reflect sources with high 232Th/238U (~4.7) and are largely co-located with Eoarchean–Paleoarchean crust. The Pb isotope compositions of most granites, and those of VHMS and gold ores, define a mixing array between a mantle Pb source and a Th-rich Eoarchean-Paleoarchean source. Pb isotope modelling indicates that the high-κPb source rocks experienced Th/U fractionation at ~3.3 Ga. As Th/U fractionation in the Yilgarn Craton must have occurred before Earth’s atmosphere was oxygenated, subaerial weathering cannot explain the apparent differences in their geochemical behavior. Instead, the high Th/U source reflects Eoarchean–Paleoarchean rocks that experienced prior high-temperature metamorphism, partial melting, and melt loss in the presence of a Th-sequestering mineral like monazite. Archean Pb isotope variability thus has its origins in open-system high-temperature metamorphic processes responsible for the differentiation and stabilization of Earth’s continental crust.</div>
<b>Citation:</b> M.I.H. Hartnady, C.L. Kirkand, S.P. Johnson, R.H. Smithies, L.S. Doucet, D.R. Mole; <i>Origin of Archean Pb isotope variability through open-system Paleoarchean crustal anatexis</i>. Geology 2023;
Simple
Identification info
- Date (Creation)
- 2023-09-26T16:00:00
- Date (Publication)
- 2023-12-13T05:38:48
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/148936
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Hartnady, M.I.H.
External Contact Author Kirkland, C.L.
External Contact Author Johnson, S.P.
External Contact Author Smithies, R.H.
External Contact Author Doucet, L.S.
External Contact Author Mole, D.R.
External Contact Publisher Geological Society of America
External Contact
- Name
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Geology
- Purpose
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Journal paper
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Resource provider Minerals, Energy and Groundwater Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Mole, D.
Internal Contact
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- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- Not planned
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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
- Keywords
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continental crust
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- Keywords
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Archean
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- Keywords
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Lead isotopes
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- theme.ANZRC Fields of Research.rdf
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Isotope Geochemistry
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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-ShareAlike 4.0 International Licence
- Alternate title
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CC-BY-SA
- Edition
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4.0
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Role Organisation / Individual Name Details User Any
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© 2023 The Authors
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- 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
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice facsimile
- OnLine resource
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Link to Journal
Link to Journal
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-
Resource lineage
- Statement
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<div>Product is a derivative of D Mole's collaborations with GSWA and Curtin.</div>
Metadata constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/49778274-905d-4bf8-a992-20ec750dbd9f
- Title
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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 Mole, D.
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/148936
- Date info (Creation)
- 2023-12-13T05:18:30
- Date info (Revision)
- 2023-12-13T05:18:30
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