31. Such examples include biotite-rich zones, amphibolite -calcite-scapolite alteration and other unusual skarn assemblages. 32. Amphibolite and chert tectonic blocks also occur in the dunite near the area's southern and western boundaries.33. The Guilleries is one of the few places in the Catalan Mediterranean System where amphibolite facies conditions are found. 34. Moreover, monazite is suitable in dating relatively low-temperature metamorphism for example amphibolite -facies than zircon. 35. At Erlongwan, this basement is formed by the Anshan Migmatites and represented by amphibolite , gneiss and quartzites. 36. Here's another idea : Look for gneisses and amphibolites ; seek out scarps, klippes and fault slices. 37. Sark is made up mainly of amphibolite and granite gneiss rocks, intruded by igneous magma sheets called quartz diorite. 38. The surface is hilly, covered by thick Hercynean amphibolites 950 million years old, the oldest rocks in Italy. 39. The metapelites are of granulite facies and the ultramafics are of greenschist facies and the enclosing gneisses represent amphibolites facies. 40. The metamorphic grade is considered to be peak granulite facies, but the majority has preserved peak amphibolite facies assemblages.
