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World Data Base. Part 1: The Kuroko Deposits (CODES publication 4)

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Ruxton, P (1986) World Data Base. Part 1: The Kuroko Deposits (CODES publication 4). Technical Report. University of Tasmania/AMIRA International, Hobart, Australia.

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Abstract

Tonnages and grades of volcanogenic massive sulphide deposits of the Kuroko Province are low in comparison to Tasmanian ores. The deposits are richer in copper and contain a greater proportion of stockwork/stringer ores. Mineralisation is related to back-arc rifting in a mature island-arc setting. Footwall rocks are dominantly felsic and calc-alkaline in contrast to bimodal high-alumina hangingwall volcanics. Bimodal volcanism is a product of rifting and graben fill. Pelagic mudstones and foraminifera indicate a water depth in excess of 2000 m post-rifting and syn-mineralisation. Massive sulphide deposits are believed related to caldera collapse in well defined basins or Districts. Linear arrangement of ore bodies indicate a structural control during deposition. Mineralisation is spatially related to domal dacite intrusives. Post-mineralisation dome expansion produced penecontemporaneous deformation of the Kuroko ores. Individual ore deposits are small but tend to form clusters of average 1.5 x 3.0 km size. Ores show a marked zonation from ferruginous cherts (Tetsusekiei), baryte ore, black ore (Kuroko), yellow ore (Oko), gypsum ore (Sekkoko) and siliceous ore (Keiko). The proportion of the various ore types differs from deposit to deposit, between Districts and with hydrothermal fluid temperature. Bottom current reworking of stratabound massive sulphide produced clastic textures. Syn-sedimentary folding and irregular ore clast compaction structures indicate the ore was plastic during deposit formation. Hydrothermal breccias and dykes cross-cut massive sulphide. Both pipe-like and blanket stringer zones underlie the stratabound ores.

Item Type: Report (Technical Report)
Publisher: University of Tasmania/AMIRA International
Additional Information: © University of Tasmania 1986
Date Deposited: 22 Jul 2009 01:51
Last Modified: 18 Nov 2014 04:02
URI: http://eprints.utas.edu.au/id/eprint/8889
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