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In the Precambrian basement of the Schirmacher Hills, ductile shear zones have developed at several stages over a wide time-span of tectonothermal history. The earliest shear zones were formed under granulite facies conditions producing well-foliated gneiss. The majority of the ductile shear zones developed under amphibolite facies conditions. The sheared rock is a mylonite characterized by drastic...
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