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The North China Craton (NCC) constitutes one of the fundamental Precambrian nuclei of Asia. The Paleoproterozoic khondalite belt along the northern margin of the NCC shows evidence for extreme crustal metamorphism at temperatures exceeding 1000 °C and pressures of 10–12 kbar with the formation of diagnostic ultrahigh-temperature (UHT) mineral assemblages including sapphirine+quartz, high alumina orthopyroxene+sillimanite...
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