Authors / CoAuthors
Raymond, O.L.
Abstract
Copper-gold mineralisation in the Moonta-Wallaroo district of the south-eastern Gawler Craton is associated with regionally extensive magmatism and Na-Fe-K metasomatism, typical of Fe-oxide Cu-Au mineral provinces worldwide. In the Moonta-Wallaroo district, early widespread albite+/-actinolite+/-magnetite alteration is closely associated with magmatic fluids from granites of the Hiltaba Suite (ca. 1600 Ma) infiltrating the metasedimentary Wallaroo Group host rocks. Zones of biotite-magnetite alteration, often in highly foliated structural zones, also formed at this time and are associated with minor Cu mineralisation. Dating of monazite and titanite associated with magnetite-bearing alteration shows a strong temporal link with Hiltaba magmatism. Copper mineralisation is most closely associated with later chlorite-quartz-hematite-kfeldspar veining and alteration which overprints, replaces and demagnetises the early magnetite-bearing alteration. Latest stage alteration occurs as kaolinite-quartz and quartz-carbonate-hematite epithermal style alteration and veining, most notably along the Alford Shear Zone on the southern margin of the Tickera Granite. This late argillic alteration is also seen as a late overprint in the Wheal Hughes mine at Moonta. Drill targeting has historically often been of magnetic anomalies, but alteration paragenesis suggests that magnetic lows due to de-magnetising copper-bearing fluids may be better drill targets.
Product Type
nonGeographicDataset
eCat Id
68373
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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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- PowerPoint
- ( Theme )
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- geochemistry
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- AU-SA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
2002-01-01T00:00:00
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geoscientificInformation
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[-35.459, -32.573, 136.57, 138.339]
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