福建永定大排铁铅锌多金属矿区岩浆岩地球化学特征及其地质意义  

Geochemical Characteristics of Magmatic Rocks in the Dapai Fe-Pb-Zn Polymetallic Deposit in Yongding County,Fujian Province and Its Implications

作　　者：赵希林[1] 姜杨[1] 邢光福[1] 黄文成[1] 余明刚[1] 刘凯[1] 王存智[1] 

机构地区：[1]中国地质调查局南京地质调查中心,南京210016

出　　处：《矿物岩石地球化学通报》2017年第1期154-165,共12页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重点研发计划课题(2016YFC0600205);中国地质调查局地质矿产调查项目(DD20160037)

摘　　要：大排铁铅锌多金属矿床是近年来新发现的一个大型矿床,为探讨矿区内的岩浆作用特征及其与成矿的关系,对与成矿作用有关的花岗岩类进行了全岩地球化学及Sr-Nd-Hf同位素测试。结果表明,矿区花岗岩与二长花岗斑岩均属于壳幔混源型花岗岩,可能是在岩浆底侵作用下由中元古代地壳物质部分熔融所致;Sr-Nd-Hf同位素特征反映幔源物质在其形成过程中起到了重要作用,其(^(87)Sr/^(86)Sr)_i值和ε_(Nd)(t)的变化趋势表明闽西南地区早白垩世地幔岩浆在岩浆形成过程中的参与程度逐渐加大,壳幔作用下形成的花岗质岩浆作用对闽西南地区成矿起到了积极作用。The Dapai Fe-Pb-Zn polymetallic deposit, a newly discovered large polymetallic deposit, is located in Yongding County, Southwestern Fujian province. In order to understand the magmatism and its role in polymetal mineralization of the deposit, our study focused on the elemental geochemistry and Sr-Nd-Hf isotopic compositions of mineralization-related granodiorite porphyry and granodiorite. Elemental and isotopic compositions show that these granitic rocks were derived from mixed crustal-mantle sources. Sr-Nd-Hf isotopic compositions suggested partial melting of Mesoproterozoic crust was possibly triggered by underplating of mantle-derived magmas. The trends of （87Sr/86Sr） ; and εnd（t） shows that the proportion of mantle components have increased in later-formed rocks so that the crust-mantle interaction may have played an important role in the metallization in Southwest Fujian province.

关 键 词：福建永定大排铁铅锌矿 地球化学 SR-ND-HF同位素 成矿作用 

分 类 号：P618.2[天文地球—矿床学] P588.1[天文地球—地质学]