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Low- 18 O felsic igneous rocks (with δ 18 O values of <5‰) are a group of volumetrically minor rocks that in their genesis require involvement of oxygen from seawater or meteoric water at high temperature. Most low- 18 O felsic rocks are reported in caldera or rift settings, where high-temperature hydrothermal exchange of surface waters with source rocks readily imprints...
We report here for the first time the occurrence of sapphirine-bearing granulites within the Qinling Group of the Qinling-Tongbai orogen and provide robust evidence for extreme crustal metamorphism at ultrahigh-temperature (UHT) conditions. We document the UHT indicator of sapphirine and spinel in a mafic granulite consisting of orthopyroxene, biotite, plagioclase, amphibole and rutile/ilmenite. The...
The in-situ EMP (electron microprobe) monazite age dating performed directly in the polished sections, in addition to the conventional U–Pb zircon and EMP monazite age dating on grains from heavy mineral concentrates, has been applied to the granulite, charnockite and gneiss in the Gaozhou Complex of the Yunkai massif in South China. While the conventional dating systems all give Caledonian ages,...
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