Quartz-kaolinite rocks from northeastern new south wales: distal products of a pluton-driven hydrothermal system
Titel:
Quartz-kaolinite rocks from northeastern new south wales: distal products of a pluton-driven hydrothermal system
Auteur:
Leitch, Evan C. Feenan, John P.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 36 (1989) nr. 2 pagina's 275-281
Jaar:
1989-06
Inhoud:
In the Long Flat district of northeastern New South Wales, elongate lenses composed largely of quartz and kaolinite have been produced by the alteration of Palaeozoic volcaniclastic sedimentary rocks and silicic dykes. Alteration was brought about by heated acid waters, probably at temperatures of about 200°C, that circulated along fractures in otherwise impervious rocks, and the lenses are considered to delineate discharge channels of a hydrothermal circulation system associated with a cooling granite pluton. High water: rock ratios are indicated. SiO2 was added during alteration and CaO, Na2O, MgO and Sr, Cu, Zn and Pb were removed. Some of the metals mobilized may have formed mineralized veins of the type found in the surrounding region.
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