The intermediate_basic and intermediate_acid dykes existent in the gold fields of Jiaodong peninsula, China, belong to a suite of intermediate-basic and intermediate-acid carbonate minerals-rich rocks consisting of lamprophyres and andesite porphyrites. Detailed studies of carbon and oxygen isotopes of carbonate minerals of the dykes and oxygen isotopes of the dykes in the gold fields (i. e. Linglong, Rushan and Sanjia gold deposits) show thatδ13CPDB, calcite,δ18OSMOW calciteandδ18OSMOW,whole-rockvalues of the intermediate_basic and intermediate_acid dykes in the gold fields are in the range of -3.6‰~-0.9‰, 6.9‰~11.6‰and 5.8‰~ 7.4‰respectively. These data were used to determine theδ18OSMOW,whole-rock,δ18OSMOW calcite andδ13CPDB,calcitevalues of the magmas in the source region and to study the isotope exchange of the magmas with the country rocks. Combined with the study of the geological setting for emplacement of the dykes, it is suggested that the magmas forming the intermediate-basic and intermediate_acid dykes in the gold fields are products of the evolution of the cognate magmas.The parent magmas originated from an enriched mantle (δ18OSMOW,carbonate: 9. 2‰、δ13CPDB,carbonate:-4.4‰andδ18OSMOW, magma: 5.8‰), which experienced metasomatism of the lithosphere mantle with the fluids that were generated during the subduction of the oceanic plate and then infiltrated into the lithosphere. Different isotopic effects in the evolution of magma seem to have been the main factors leading to the distinctive features of carbon and oxygen isotopes in the gold fields.