Potassic alteration and veining and the age of copper emplacement at Mount Isa, Australia

Caroline Perkins, Christoph A. Heinrich, Lesley A. Economic Geology ; 94 1 : 23— Biotite that is broadly contemporaneous with the formation of the alteration envelope to the breccia-hosted Cu orebodies silica-dolomite alteration in dolomite-rich metasediments at the Mount Isa mine yields ages of ca. District-scale fracture zones in metabasalts to the east of Mount Isa, which are associated with characteristic metabasalt alteration and local U mineralization, show the same relative timing to regional metamorphic foliation as the Cu-mineralized breccias, and have identical fluid inclusion and isotopic characteristics to the Cu-related silica-dolomite alteration at the Mount Isa mine. More extensive dating of the regional alteration is needed to fully determine the timing of hydrothermal activity but it appears that carbonate-Fe oxide-altered fracture zones in metabasalt may be district-scale exploration indicators of the mildly oxidizing hydrothermal systems capable of forming Mount Isa-style, late metamorphic, Cu ores. The earliest the high-grade rocks could have been uplifted into their current position would be after ca.

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Request PDF | Evolution of Pre Ga basement rocks in the western Mt Isa Inlier, northeastern Australia—Insights from SHRIMP U–Pb dating and in-situ Lu–Hf.

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rocks of the Cannigton Ag-Pb-Zn deposit, southeastern Mt Isa Block, Australia. SHRIMP U-Pb zircon dating of the host rocks of the Cannigton.

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These older ages are from rocks in which biotite is likely to be metamorphic rather than hydrothermal in origin. Unambiguous potassic alteration related to copper formation is characterised by biotite replacement of metabasalt brownstones and potassium feldspar replacement of meta-tuffs. Unable to display preview. Download preview PDF.

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The 40 Ar/ 39 Ar dating of hydrothermal micas is used to determine the District-​scale fracture zones in metabasalts to the east of Mount Isa.

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