Product catalogue
Mid- to lower-crustal architecture of the northern Lachlan and southern Thomson orogens—evidence from O-Hf isotopes
The nature of the substrate below the northern Lachlan Orogen and the southern Thomson Orogen is poorly understood. We investigate the nature of the mid- to lower-crust using O and Lu-Hf isotopes on zircons from magmatic rocks which intrude these regions, and focus on the 440–410 Ma time window to minimise temporal effects while focussing on spatial differences. Over the entire region, O-isotope values range from δ18O = 5.52‰ to 10.14‰, and Lu-Hf from εHft = -8.1 to +8.5. In the northern Lachlan Orogen and much of the southern Thomson Orogen, magmatic rocks with low εHft (c. -8 to -4) and elevated δ18O (c. 9 to 10‰) reflect a supracrustal source. Magmatic rocks intruding the Warratta Group in the western part of the Thomson Orogen also have low εHft (c. -10 to -6) but more subdued δ18O (c. 7‰), indicating a distinct supracrustal source in this region. In the northeast Lachlan Orogen, magmatic rocks record mixing of the supracrustal source with input from a juvenile source (εHft as high as +8.5, δ18O as low as 5.52‰), most likely of “Macquarie Arc”-type affinity. Samples in the west-southwest Thomson Orogen also record some evidence of juvenile input (εHft as high as +0.2, δ18O as low as 6.51‰), likely the Mount Wright Arc of the Koonenberry Belt. Our results show that internal isotopic variation within the Lachlan and the Thomson orogens is much greater than the difference between the two orogens.
<b>Citation:</b>
K. Waltenberg, S. Bodorkos, R. Armstrong & B. Fu (2018) <i>Mid- to lower-crustal architecture of the northern Lachlan and southern Thomson orogens: evidence from O–Hf isotopes, </i>Australian Journal of Earth Sciences, 65:7-8, 1009-1034, DOI: 10.1080/08120099.2018.1463928
Simple
Identification info
- Date (Creation)
- 2018-01-01
- Date (Publication)
- 2023-08-23T22:53:44
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/112005
- Cited responsible party
-
Role Organisation / Individual Name Details Author Waltenberg, K.
MEG Internal Contact Author Bodorkos, S.
MEG Internal Contact Author Armstrong, R.
External Contact Author Fu, B.
External Contact Publisher Informa UK Limited, trading as Taylor and Francis Group
External Contact
- Name
-
Australian Journal of Earth Sciences
- Purpose
-
Release of isotopic O+Hf data and interpretation
- Status
- Completed
- Point of contact
-
Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Waltenberg, K.
MEG Internal Contact Resource provider Minerals, Energy and Groundwater Division
External Contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
-
Product data repository: Various Formats
- Website
-
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
- theme.ANZRC Fields of Research.rdf
-
-
EARTH SCIENCES
-
- Keywords
-
-
Thomson Orogen
-
- Keywords
-
-
Lachlan Orogen
-
- Keywords
-
-
Lu-Hf Isotopes
-
- Keywords
-
-
Oxygen Isotopes
-
- Keywords
-
-
zircon
-
- Keywords
-
-
Macquarie Arc
-
- Keywords
-
-
Mount Wright Arc
-
- Keywords
-
-
Warratta Group
-
- Keywords
-
-
Olepoloko Fault
-
- Keywords
-
-
Published_External
-
Resource constraints
- Title
-
Creative Commons Attribution 4.0 International Licence
- Alternate title
-
CC-BY
- Edition
-
4.0
- Access constraints
- License
- Use constraints
- License
- Other constraints
-
(c) 2018 Crown Copyright in the Commonwealth of Australia.
Resource constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
-
Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice facsimile
- OnLine resource
-
Link to Journal
Link to Journal
- Distribution format
-
Resource lineage
- Statement
-
Journal Article for submission to the Australian Journal of Earth Sciences
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/5f084aca-797e-4f0c-ad4d-8d2dbfdec05d
- Title
-
GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
-
Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Waltenberg, K.
MEG Internal Contact
Type of resource
- Resource scope
- Document
- Name
-
Journal Articles and Conference Papers
Alternative metadata reference
- Title
-
Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/112005
- Date info (Creation)
- 2017-07-23T23:59:41
- Date info (Revision)
- 2017-07-24T00:03:53
Metadata standard
- Title
-
AU/NZS ISO 19115-1:2014
Metadata standard
- Title
-
ISO 19115-1:2014
Metadata standard
- Title
-
ISO 19115-3 (Draft Schemas 2015)
- Edition date
- 2015-07-01T00:00:00
- Title
-
Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
-
Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551