Authors / CoAuthors
Champion, D.C. | Smithies, R.H.
Abstract
The mid to late Archaean Yule Granitoid Complex lies in the westernmost part of the East Pilbara Granite-Greenstone Terrane, and is dominated by generally potassic, felsic (66-76% SiO2), calc-alkaline granitoids, with Sr-depleted, Y-undepleted compositions and mostly moderate to large negative Eu anomalies. These characteristics all indicate the significant involvement of a felsic crustal source. Typical Archaean Tonalite-Trondhjemite-Granodiorite (TTG) series are not found, even amongst the very oldest (>3.4 Ga) granites. The most TTG-like granitoids are post-3270 to 2930 Ma in age, are confined to the westernmost part of the complex, and share some similarities with granites found in the West Pilbara Granite-Greenstone Terrane. An abundance of post 2950 Ma granite also contrasts the Yule Granitoid Complex with complexes in the eastern part of the East Pilbara Granite-Greenstone Terrane, where such rocks are uncommon. This feature, and the presence of c. 2945 Ma Mungaroona Granodiorite (high-Mg diorite suite) in the western part of the Yule Granitoid Complex, is probably related to the tectonic development of the adjacent Central Pilbara Tectonic Belt.
Product Type
nonGeographicDataset
eCat Id
37304
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Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
Australia
Keywords
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- External PublicationScientific Journal Paper
- ( Theme )
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- geochemistry
- ( Theme )
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- geology
- ( Theme )
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- geochronology
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2000-01-01T00:00:00
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unknown
Topic Category
geoscientificInformation
Series Information
42-48
Lineage
Unknown
Parent Information
Extents
[-22.0, -20.0, 116.0, 120.0]
Reference System
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