Authors / CoAuthors
Champion, D.C. | Bultitude, R.J.
Abstract
S-type granites crop out extensively (>2500 km2) in the central and eastern parts of the Hodgkinson Province, north Queensland, Australia, forming two NW to NNW trending belts, outboard of an extensive belt of (mainly late Carboniferous) I-type granites. The S-type granites, which comprise muscovite-biotite syenogranite and monzogranite, and rare granodiorite, have been subdivided in two major supersuites: the Whypalla and Cooktown Supersuites; and a number of minor suites - including the highly differentiated Wangetti and Mount Alto Suites. The S-type granites intrude a very extensive, siliciclastic flysch sequence (late Silurian? to earliest Carboniferous) that is isotopically evolved (e.g., Nd mostly -12.0 to -15.0 at 270 Ma), and generally too mature (too CaO poor) to produce S-type granites. Isotopic and chemical modeling show that although magma-mixing is permissible, the levels permissible (<ca 20-25% basaltic input), are not large enough to explain the signature of the S-type granite. Either more complex mixing models, e.g., crustal melts with a history of mixing, or the presence of more suitable metasedimentary source rocks at depth, is required. The latter is consistent with the (uncommon) presence within the eastern parts of the Hodgkinson Province of metasediments with isotopic signatures similar to the S-type granites. These provide strong support for more extensive such rocks at depth, consistent with other local geology and accretionary tectonic models for the region.
Product Type
nonGeographicDataset
eCat Id
72923
Contact for the resource
Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External Publication
- ( Theme )
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- geochemistry
- ( Theme )
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- petrology
- ( Theme )
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- geology
- ( Theme )
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- geochemical modelling
- ( Theme )
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- isotopes
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2012-01-01T00:00:00
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unknown
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geoscientificInformation
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Unknown
Parent Information
Extents
[-19.0, -14.0, 144.0, 146.5]
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