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

摘要

Hydrogen isotope compositions of mantle-derived amphibole megacrysts from Qilin, Guang- dong Province have been obtained by micro-probe.δD and H contents are constant both among dif- ferent samples and within single sample, demonstrating that their formation condition is very stable. HighδD 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.