Authors / CoAuthors
Lewis, C. | Bultitude, R.J. | Hutton, L.J. | Waltenberg, K. | Armstrong, R.A. | Evans, N.
Abstract
The Kalkadoon-Leichhardt Domain of the Mount Isa Inlier has been interpreted to represent the ‘basement’ of the larger inlier, onto which many of the younger, economically prospective sedimentary and volcanic units were deposited. The domain itself is dominated by 1860–1850 Ma granitic to volcanic Kalkadoon Supersuite rocks, but these units are interpreted to have been emplaced/erupted onto older units of the Kurbayia Metamorphic Complex. This study aims to provide insights into a number of geological questions: 1. What is the isotopic character of the pre-1860–1850 Ma rocks? 2. How do these vary laterally within the Kalkadoon-Leichhardt Domain? 3. What is the tectonic/stratigraphic relationship between the 1860–1850 Ma rocks of the Mount Isa Inlier and c. 1850 Ma rocks of the Tennant Creek region and Greater McArthur Basin basement? Detrital zircon U–Pb results indicate the presence of 2500 Ma detritus within the Kurbayia Metamorphic Complex, suggesting that the Kalkadoon-Leichhardt Domain was a sedimentary depocentre in the Paleoproterozoic and potentially had sources such as the Pine Creek Orogen, or, as some authors suggest, potential sources from cratons in northern North America. Existing Hf and Nd-isotopic data suggest that the ‘basement’ units of the Mount Isa Inlier have early Proterozoic model ages (TDM) of 2500–2000 Ma. Oxygen and Hf-isotopic studies on samples from this study will allow us to test these models, and provide further insights into the character and history of these ‘basement’ rocks within the Mount Isa Inlier, and northern Australia more broadly.
Product Type
document
eCat Id
120990
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
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Keywords
- ( Place )
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- Kalkadoon
- ( Place )
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- Leichhardt
- ( Place )
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- Mount Isa
- ( Theme )
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- geochronology
- ( Theme )
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- isotopes
- ( Theme )
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- U-Pb
- ( Theme )
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- U-Pb Dating
- ( Theme )
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- Lu-Hf Isotopes
- ( Theme )
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- O Isotopes
- ( Theme )
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- Age
- ( Theme )
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- Radiometric Age
- ( Theme )
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- Kalkadoon Supersuite
- ( Theme )
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- Kurbayia Metamorphic Complex
- ( Theme )
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- zircon
- ( Theme )
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- titanite
- ( Theme )
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- metamorphic
- ( Theme )
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- magmatic
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- Published_External
Publication Date
2022-08-11T04:53:26
Creation Date
2018-05-23T00:00:00
Security Constraints
Classification - unclassified
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Status
completed
Purpose
To provide new geoscientific isotopic data from across the Mount Isa region as part of the Exploring for the Future program.
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asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
This is new isotopic data collected as part of Exploring for the Future program in order to understand the crustal evolution of the Tennant-Isa segment of the North Australian Craton. It is reported here for the first time. Sample data were acquired through Geoscience Australia sampling programs associated with 1) the Exploring for the Future program; 2) National Collaborative Framework geochronology project(s) agreements with the Geological Survey of Queensland.
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Extents
[-24.8864, -18.0205, 137.9821, 140.8386]
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Spatial Resolution
Low
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