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| Coombah Granite | |
|---|---|
| Name | Coombah Granite |
| Type | Intrusive igneous rock |
| Composition | Granite |
Coombah Granite is a named granitic intrusive body recognized in regional mapping and petrological studies. It is cited in geological surveys and academic literature and has been used as a reference for granite emplacement, mineralization, and regional tectonics in the area where it outcrops. The unit has attracted attention from geologists, mining companies, universities, and government geological surveys for its petrology, age constraints, and economic potential.
The Coombah Granite is described as a coarse- to medium-grained granitoid intruding host metavolcanic and metasedimentary sequences, and has been characterized in field campaigns by staff from the Geological Survey of Western Australia, researchers affiliated with the Australian National University, and consultants from firms like Rio Tinto and BHP. Detailed petrological analysis has involved collaborations among teams at the University of Melbourne, Monash University, and the University of Adelaide, with thin-section studies conducted following protocols used by the United States Geological Survey and the British Geological Survey. Field relationships indicate contact metamorphism, development of hornfels in country rocks mapped by the Department of Mines and Petroleum (Western Australia), and structural control by regional shear zones correlated with features mapped by the Geological Survey of Queensland and the Geological Survey of New South Wales.
Outcrops of this granite are reported in regional mapping campaigns coordinated with agencies such as the Western Australian Museum, the Australian Bureau of Mineral Resources, and local shire geological offices. The pluton occurs proximal to named localities and cadastral features mapped by the Department of Lands (Western Australia), and is spatially associated with mineral occurrences catalogued by the Geological Survey of Victoria database. Exploration tenements held by companies including Newmont, AngloGold Ashanti, and junior explorers registered with the Australian Securities Exchange have targeted the Coombah Granite contact zones where streams and ridges expose fresh rock for sampling. Remote sensing studies used data from Geoscience Australia, satellite imagery from providers coordinated with the Bureau of Meteorology, and geophysical surveys contracted to firms such as Schlumberger and Halliburton helped map its subsurface extent in areas also covered by the Northern Territory Geological Survey.
Isotopic dating campaigns on Coombah Granite samples have employed laboratories associated with the Australian National University Radiogenic Isotope Facility, the Curtin University WA-ICPMS Lab, and international collaborators at the University of Oxford and ETH Zurich. U–Pb zircon ages have been compared with regional chronologies established by studies tied to the Australian Stratigraphic Units Database and correlated with tectonothermal events recorded in units catalogued by the International Continental Scientific Drilling Program and the Geological Society of London. Interpretations place emplacement within a broader orogenic framework comparable to settings discussed in papers from the Royal Society of London, the American Geophysical Union, and conferences hosted by the Australian Academy of Science.
Mineralogical descriptions reference primary phases identified using instruments and standards from facilities such as the Commonwealth Scientific and Industrial Research Organisation (CSIRO), the University of Western Australia electron microprobe laboratory, and X-ray facilities at the Australian Synchrotron. Reported assemblages include quartz, K-feldspar, plagioclase, biotite, muscovite, and accessory titanite and zircon, with geochemical signatures determined by ICP-MS and XRF workflows following methods used by the International Atomic Energy Agency and the United Nations Educational, Scientific and Cultural Organization in collaborative rock chemistry programs. Trace element patterns show affinities discussed in comparative studies that reference suites from the Broken Hill domain, the Yilgarn Craton, and cratonic comparisons published through the Geological Society of America.
The Coombah Granite has been evaluated for dimension stone, aggregate, and as a host for hydrothermal mineralization explored by companies like Gold Fields, Fortescue Metals Group, and prospectors registered with the Chamber of Minerals and Energy of Western Australia. Bulk sampling and reserve estimations have been reported to regulatory bodies such as the Department of Industry, Science and Resources (Australia), and mineral rights transactions have appeared in filings with the Australian Securities and Investments Commission. Quarrying methods cited in technical reports reference equipment suppliers and contractors including Caterpillar Inc., Komatsu, and engineering consultants who have worked on projects funded in part by state development agencies and the Australian Trade and Investment Commission.
Initial mapping and nomenclature were established through surveys conducted by the Bureau of Mineral Resources and subsequent revisions by staff at the Geological Survey of Western Australia and academic contributors from institutions such as Flinders University and the University of Tasmania. Peer-reviewed descriptions and monographs have appeared in outlets associated with the Australian Journal of Earth Sciences, the Geological Society of Australia, and proceedings from meetings of the International Geological Congress. The name entered regional lexicons and mining reports and has been referenced in theses archived at the National Library of Australia, institutional repositories at the University of Sydney, and databases curated by Geoscience Australia.
Category:Granite formations