By Karl H. Wolf (Eds.)
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Additional info for Cu, Zn, Pb, and Ag Deposits
Similar low extraction rates are required for deposits in other terrains. For example, the Rosebery deposit probably contained 2 · 1 0 1 2 g Zn, 1 · 1 0 1 2 g Pb and 5 · 1 0 1 0 g Cu and is underlain by 3 to 4 km of Andean-type calc-alkaline volcanic rocks domi nated by rhyolites. I f the convection cell had an area of 49 k m (see Figs. 3 ppm Cu. 9)* 72 Shales Greywackes Thompson et al. (1972) 3-<2 calc-alkaline basalt 116 - 99 calc-alkaline andésite 96 - 85 calc-alkaline rhyolite -43 - -55 average average 45 45 20 95 60 Baragar and Goodwin (1969) Descarreaux (1973) Wedepohl (1968) Wedepohl (1968) * Result after excluding Yellowknife Belt.
Lapwood (1948) was able to show that in a fluid-saturated, horizontal, permeable slab under the influence of a vertical temperature gradient, convection is only possible if the Rayleigh number of the system exceeds a certain value. , is given by kotgHAT where k = permeability; a = coefficient of cubical expansion; g = gravitational constant; H = thickness of the medium; AT = temperature difference between top and bottom of the permeable slab; K = thermal diffusivity of the water-saturated medium; ν = kinematic viscosity.
The local ization of ores mainly in felsic rocks within mafic-dominated terrains is the trend for most of the Canadian Archaean, but does not apply generally in the Phanerozoic. For example, in the basalt- and andésite-dominated terrains of the island arcs from New Guinea to Fiji, massive sulphide deposits occur in dacites and rhyolites (Undu, Vanua Levu; Rickard, 1970; Colley and Rice, 1975) and in andésites (Wainivesi, Viti Levu; Rodda, 1963) while in the Solomon Islands pyrite-chalcopyrite mineralization is known in basalts of ocean-floor or low-K tholeiite type (Taylor, 1974).
Cu, Zn, Pb, and Ag Deposits by Karl H. Wolf (Eds.)