Product catalogue
Crustal architecture of Precambrian Australias south-eastern margin - an isotopic perspective
<div>The Australian continent comprises a broad dichotomy of crustal settings; from the Archean–Proterozoic cratonic core in the centre and west, to the accretionary margin of the Tasmanides in the east. These continental blocks meet at the Tasman Line, where successive arc systems built the eastern third of Australia in ca. 250 Myrs. This interface represents one of Australia’s most fundamental crustal boundaries and is marked by the ca. 520–490 Ma Delamerian Orogen in south-eastern Australia. Despite its first-order crustal control on tectonism, magmatism, deformation, and mineral systems in the area, the Delamerian Orogen remains poorly understood. Here, we present new zircon Hf-O isotopic and trace element data on 32 samples across the south-east Tasman Line. This initial dataset, which will grow over the next 12 months as part of Geoscience Australia’s Exploring for the Future program, will be used to constrain the time-space crustal architecture and evolution of Australia’s south-eastern Precambrian cratonic margin. These first samples include Paleoarchean to Devonian felsic magmatic rocks from the eastern Gawler Craton, across the Delamerian Orogen, to the Central Lachlan Orogen, and show that the crust of south-east Australia has a significant pre-history, with crustal reworking a major feature across the region. Delamerian arc magmatism appears to have involved significant reworking of Australia’s south-eastern Precambrian margin, as recorded by sub-chondritic Hf-isotope data. Assuming a significant mantle-component in the initial arc magmas, contamination by the ancient overlying continental rocks, some as old as ca. 3250 Ma, resulted in less juvenile compositions. This observation suggests Australia’s south-eastern Gondwanan margin may have consisted of a west-dipping continental arc, rather than an offshore island arc. The ‘heavy’ supracrustal δ18O of magmatic rocks across the area since the Paleoproterozoic is testament to the long-lived terrestrial nature of this continental margin, and its influence on magmatism across >1 billion years of Earth history. </div>
This Abstract was submitted/presented to the 2022 Specialist Group in Geochemistry, Mineralogy and Petrology (SGGMP) Conference 7-11 November ( https://gsasggmp.wixsite.com/home/biennial-conference-2021)
Simple
Identification info
- Date (Creation)
- 2022-09-03T16:00:00
- Date (Publication)
- 2023-02-20T02:27:28
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147190
- 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 Bodorkos, S.
Internal Contact Author Stern, Richard
External Contact Author Waltenberg, K.
Internal Contact Author Fraser, G.
Internal Contact Author Evans, Noreen
External Contact
- Name
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Specialist Group in Geochemistry, Mineralogy and Petrology (SGGMP) Conference 7-11 November 2022 Yallingup WA
- Purpose
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Conference abstract for the "Specialist Group in Geochemistry, Mineralogy and Petrology" (SGGMP) conference to be held in Yalingup, WA, in November 2022.
- 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
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- Not planned
Resource format
- 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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EFTF – Exploring for the Future
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- Keywords
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Australia
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Tasmanides
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Delamerian
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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 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Addressee
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Role Organisation / Individual Name Details User Any
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- License
- Use constraints
- Other restrictions
- Other constraints
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© Commonwealth of Australia (Geoscience) 2022
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
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Link to Conference Webpage
Link to Conference Webpage
- Distribution format
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- OnLine resource
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Link to GSWA Publications and maps (pdf)
Link to GSWA Publications and maps (pdf)
- Distribution format
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Resource lineage
- Statement
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<div>These data were collected in July 2022 as part of the Exploring for the Future project and ARF Isotopic Atlas module.</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/88144a06-52e4-4595-9c4a-ce547d1ddea9
- 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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Conference Abstract
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/147190
- Date info (Creation)
- 2023-02-20T01:26:27
- Date info (Revision)
- 2023-02-20T01:26:27
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
- https://pid.geoscience.gov.au/dataset/ga/122551