Product catalogue
Hf-Nd isotopes of Archean komatiites A Hadean component in the Neoarchean mantle
<div>Komatiites are extinct volcanic rocks that formed by partial melting of 20-50% of their mantle source – a unique feature that allows us to understand the composition of the mantle in the early Earth. Due to their high temperature, komatiites incorporate proximal rock types on their way to, and on, the Earth’s surface. In this craton-scale study, we looked to use this property of komatiite magmas to track their interaction with the crust of the Yilgarn Craton. The results yielded Hf and Nd isotope arrays (Figure 1), that potentially have three components. The first likely represents the depleted mantle source of the magmas, and most plot in the region between +2 and +6 εHfi and 0 to +3.3 εNdi. The second source represents a more unradiogenic component, most likely 3.5-3.3 Ga continental crust (minimum). This component is more notable in the 2.8 and 2.9 Ga events with values trending to CHUR and negative εNd. The 2.8 Ga dataset, and particularly the komatiitic basalts from the Marda region, appear to show the most contamination with old crust. This is likely due to this area representing the old nucleus of the craton, as shown in Hf-isotope mapping. The final component represents an ultra-depleted source. Data from Ravensthorpe, Mt Clifford, and Wiluna show trends towards this source referred to as the Early Refractory Reservoir (ERR)(Nebel et al. 2014). We suggest that the 2.7 and 2.9 Ga plumes interacted with refractory Hadean plume residues, which constitute the ERR, within the Yilgarn lithosphere. Isotopic data on crustal rocks suggests the Yilgarn may have formed in the Hadean to Eoarchean, and hence the ERR could represent the residue of the Hadean crust generation process that formed the low Lu/Hf Jack Hills zircons. If correct, this suggests that the ERR survived for much longer than previously thought, as a rare component within the Earth’s oldest cratons.</div>
This Abstract was submitted/presented to the 2023 6th International Archean Symposium (6IAS) 25 - 27 July ( https://6ias.org/)
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Identification info
- Date (Creation)
- 2023-02-16T07:00:00
- Date (Publication)
- 2023-09-11T06:46:28
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147721
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Mole, D.
Internal Contact Author Marco L Fiorentini
External Contact Author Stephen J Barnes
External Contact Author Roland Maas
External Contact Author Chris L Kirkland
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6th International Archean Symposium 25-27 July 2023 Fremantle Perth WA
- Purpose
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Abstract for the 6th International Archean Symposium, to be held in Perth WA 25-27th July 2023.
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- Completed
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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.
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- Geoscientific information
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Product data repository: Various Formats
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FILE:DATA-DIRECTORY
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Data Store directory containing the digital product files
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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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Archean
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komatiites
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isotopes
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Hadean
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Yilgarn
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Western Australia
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- theme.ANZRC Fields of Research.rdf
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Isotope Geochemistry
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Published_External
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Creative Commons Attribution 4.0 International Licence
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CC-BY
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4.0
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© Commonwealth of Australia (Geoscience Australia) 2023
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Australian Government Security Classification System
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- 2018-11-01T00:00:00
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- Unclassified
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Australian Government Security Classification System
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- English
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- UTF8
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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Link to Conference Page
Link to Conference Page
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<div>Abstract contains data from the primary authors 2014-2017 post-doc at CSIRO, written up as an abstract for the 6IAS.</div>
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
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urn:uuid/b1e777cb-ff81-4733-b15c-93c4371eca17
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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.
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- Document
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Conference Abstract
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/147721
- Date info (Creation)
- 2023-09-11T06:00:02
- Date info (Revision)
- 2023-09-11T06:00:02
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