Ancient Archaean supracrustal rocks from the Limpopo Mobile Belt

Sapphirine parageneses from the Caraiba complex, Bahia, Brazil: the influence of Fe2+–Fe3+ distribution on the stability of sapphirine in natural assemblages

“…Such rocks are commonly developed in comparable Archaean high-grade terranes in close association with layered complexes, which contain prominent anorthosites, leucogabbros and meta-supracrustal rocks, e.g. Fiskenaesset, West Greenland (Herd, Windley & Ghisler, 1969;Herd, 1972;Herd & Windley, in press); the Limpopo belt of southern Africa (Horrocks, 1980(Horrocks, , 1983Ackermand, Herd & Windley, 1982;Windley, Ackermand & Herd, 1984); Sittampundi, southern India (Janardhan & h a k e , 1974); in the Arunta block of central Australia (Katz, 1981); and in Madagascar (Lacroix, 1941). There is an interesting comparison between the Curat$ valley sapphirinebearing and associated rocks and those from the Fiskenaesset region of West Greenland.…”

Fluid compositions and local fluid buffering during the retrograde metamorphism of Al-bearing dolomitic calc-silicate granulites in the Limpopo Central Zone, southern Africa

“…Peak metamorphic (M1) conditions were estimated at T > 800°C and at a pressure as high as 1.0 GPa (Horrocks, 1980(Horrocks, , 1983Fripp, 1983;Windley et al, 1984;Van Reenen et al, 1987;Droop, 1989;Tsunogae and Miyano, 1989). The subsequent isothermal decompression (M2) continued to 0.5-0.7 GPa in excess of 750°C (e.g.…”