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Shear zone with a op-to-the NE sense of shear in the high-grade metamorphic rocks with granulite facies relics, Wilson Terrane, Ross Orogeny (Antarctica). The age is nearly 440 Ma.
In the lower part: dolerite dyke; in the upper part amphibolites. A small leucogranite dyke is progressively deflected and stretched entering in the shear zone. PhotoID193

Shear zone with a op-to-the NE sense of shear in the high-grade metamorphic rocks with granulite facies relics, Wilson Terrane, Ross Orogeny (Antarctica). The age is nearly 440 Ma.
In the lower part: dolerite dyke; in the upper part amphibolites. A small leucogranite dyke is progressively deflected and stretched entering in the shear zone. PhotoID193

Photograph: R. Carosi

Reference: DI VINCENZO G., CAROSI R., PALMERI R., TIEPOLO M. (2007) – A comparative U-Th-Pb (zircon-monazite) and 40Ar–39Ar (muscovite-biotite) study of shear zones from northern Victoria Land (Antarctica): implications for geochronology and localized reworking of the Ross-Orogen. J. Metamorphic Geology, 5, 605-630.