Hydrogen isotope compositions of mantle-derived amphibole megacrysts from Qilin, Guangdong and its tectonic significance

Hydrogen isotope compositions of mantle-derived amphibole megacrysts from Q ilin, Guangdong Province have been obtained by ion micro-probe. delta D and H contents are constant both among different samples and within single sam ple, demonstrating that their formation condition is very stable. High delt a D values suggest the presence of a component recycled from crust which is possibly related to the subduction of Pacific Plate beneath Eurasian Plate in Mesozoic.