Crust–Mantle Interaction in a Continental Subduction Channel: Evidence from Orogenic Peridotites in North Qaidam, Northern Tibet

A combined study of rock-forming mineral and O isotope compositions, zircon U–Pb ages, trace element compositions, mineral inclusions and Hf–O isotopes was made on orogenic peridotites from North Qaidam in northern Tibet to provide insights into crustal metasomatism at the slab–mantle interface in a continental subduction channel. Rock-forming mineral O isotope analyses yield olivine δ18O values o...