岩石矿物学杂志2001，Vol.20Issue(1)：47-56,10.
胶东金矿区矿田体系中基性-中酸性脉岩的 碳、氧同位素地球化学研究
Research on C, O Isotopic Geochemistry of Intermediate_Basic and Intermediate_Acid Dykes In Goldfields of Jiaodong Peninsula
摘要
Abstract
The intermediate_basic and intermediate_acid dykes existent inthe 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 that δ13CPDB, calcite, δ18OSMOW calcite and δ18OSMOW,whole-rock values 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 the δ18OSMOW,whole-rock, δ18OSMOW calcite and δ13CPDB，calcite values 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‰ and δ18OSMOW, 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.关键词
中基性-中酸性脉岩/碳、氧同位素/地球化学/胶东金矿区分类
天文与地球科学引用本文复制引用
孙景贵,胡受奚,姚凤良,沈昆..胶东金矿区矿田体系中基性-中酸性脉岩的 碳、氧同位素地球化学研究[J].岩石矿物学杂志,2001,20(1):47-56,10.基金项目
国家自然科学基金项目资助 （）
