Hydrogen isotopic compositions of four am-phibole grains from three pieces of Iherzolite xenoliths in Cenozoic basanites of Nushan, eastern China have been analyzed by ion microprobe. σD values of all analyzed points range from -94‰ to +46‰, some of which are much higher than the highest σD (+8‰) reported previously for mantle materials. The heterogeneities of D/H ratios within single grains have been observed, the variation of σD is up to 80‰ on the scale of less than 400 μm. No correlation between hydrogen isotopic ratios and hydrogen contents can be found, implying that the scatter of σD values could not result from a late shallow process such as hydrogen loss or hydrothermal alterations and should be considered as inherited from the source at depth. Chemical compositions of Nushan amphi-boles are very homogeneous, excluding the fact that the scatter of σD values could arise from variable fractionation factors between a single fluid source and minerals. Therefore, metasomatic fluids responsi Hydrogen isotopic compositions of four am-phibole grains from three pieces of Iherzolite xenoliths in Cenozoic basanites of Nushan, eastern China have been analyzed by ion microprobe. ΣD values ​​of all analyzed points range from -94 ‰ to + 46 ‰, some of which are The heterogeneities of D / H ratios within single grains have been observed, the variation of σD is up to 80% o on the scale of less than 400 μm. correlation between hydrogen isotopic ratios and hydrogen contents can be found, implying that the scatter of σD values ​​could not result from a late shallow process such as hydrogen loss or hydrothermal alterations and should be considered as inherited from the source at depth. Chemical compositions of Nushan amphi-boles are very homogeneous, excluding the fact that the scatter of σD values ​​could arise from variable fractionation factors between a single fluid source and minerals. Therefore, meta somatic fluids responsi