Amphibolites with eclogite pods in the Makuti Group
Grid Ref (WGS84 Lat/Long in decimal degrees)
Within the Makuti Group there are garnet-clinopyroxene-hornblende gneisses (amphibolites) that contain lenses of eclogite having igneous (corona-textured) and metamorphic (garnet-omphacite) textural associations (Broderick, 1980, 1982; Dirks and Sithole, 1999). Dirks and Sithole (1999) found peak P-T conditions of metamorphism for the eclogites of c. 19 kb, 760 ± 25°C. The surrounding amphibolitic gneisses were metamorphosed under P-T conditions of 11 ± 1.5 kb, 730 ± 50°C. Whereas Dirks and Sithole (1999) supposed that the eclogitic metamorphism took place before 850 Ma, and may have been related to Rodinia formation at around 1 Ga, it was shown by John et al. (2003) that eclogites from the Zambezi Belt have an Sm–Nd isochron age of 595 ± 10 Ma. Furthermore, a phase of high-pressure whiteschist metamorphism yielded a U–Pb monazite age of 529 ± 2 Ma (John et al., 2004), and similar ages have been found in the Lufilian Arc by Rainaud et al. (2005).
Stop 2 in the attached Field Guide