Phyllosilicates and associated minerals in some Paleozoic stratiform sulfide deposits of southeastern Australia

The hydrothermal system of Central Jebilet (Variscan Belt, Morocco): A genetic association between bimodal plutonism and massive sulphide deposits?

“…McLeod and Stanton, 1984;Poupon et al, 1988;Saez et al, 1999). This tendency is clearly illustrated in the Kettara copper deposit where chlorites armoured by quartz are Mg-rich.…”

“…McLeod and Stanton, 1984;Walshe and Solomon, 1986). In the Jebilet Cu and Pb-Zn deposits, hydrothermal alteration can be seen at the scale of the mine area or at the regional scale.…”

Actively forming Kuroko-type volcanic-hosted massive sulfide (VHMS) mineralization at Iheya North, Okinawa Trough, Japan

“…9). Work by McLeod and Stanton (1984) on the SE Australian Kuroko-type VHMS deposits (e.g. Woodlawn, Que River) observed that chlorite associated with sphalerite-rich ore had significantly lower Fe/Fe+Mg ratios than chalcopyrite-rich samples.…”

Phyllosilicate minerals in the hydrothermal mafic?ultramafic-hosted massive-sulfide deposit of Ivanovka (southern Urals): comparison with modern ocean seafloor analogues

“…9a, c) is common in chlorites of both metamorphic and hydrothermal origin (e.g. Hey 1954;Costa et al 1983;McLeod and Stanton 1984;Zhong et al 1985;Kranidiotis and MacLean 1987;Bettison and Schiffman 1988;Zang and Fyfe 1995). Covariation of Al and Fe/ (Fe+Mg) is favored by cation size change and structural adjustments in the chlorite crystal lattice and may reflect variations in protolith bulk chemistry, variable degree of hydrothermal alteration, changes in hydrothermal fluid composition and temperature (e.g.…”

“…Reported FeO contents are in the range 1-19 wt% (e.g. McLeod and Stanton 1984;Aggarwal and Nesbitt 1984;Costa et al 1983;Koski et al 1985;Kranidiotis and MacLean 1987;Lonsdale et al 1980;Shau and Peacor 1992;Goodfellow and Franklin 1993;Zierenberg et al 1995) and distinct populations characterized by either moderately (FeO £ 4 wt%) or highly ferroan compositions may occur at the same site. Available estimates of the temperatures of formation of hydrothermal talc are in the range 270-420°C (Lonsdale et al 1980;Koski et al 1985;Styrt et al 1981;Zierenberg and Shanks 1983), therefore usually higher than those reported for Mg-rich saponite.…”