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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 Mesozoic tectonics in East China is characterized by significant lithospheric thinning of the North China Craton, large-scale strike-slip movement along the Tan-Lu fault, and regional magmatism with associated metallogeny. Here we address the possible connections between these three events through a systematic investigation of the geochemistry, zircon geochronology and whole rock oxygen isotopes...
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