摘要
滇西马厂箐岩体斑状花岗岩中发育大量暗色包体。对包体和寄主岩的主量、稀土、微量元素及Pb同位素进行分析。主量和微量元素研究表明,包体及寄主岩具有一定的成因联系。Pb同位素则反映两者可能分别起源于EMⅡ和下地壳。在此基础之上结合包体岩相学研究,认为暗色包体是岩浆混合作用的产物。暗色包体对于揭示富碱岩浆起源、深部作用过程以及其与成矿的关系等提供了可靠的地质依据,反映了马厂箐岩体可能是壳幔岩浆混合成因,幔源岩浆提供了成矿物质。
A large number of dark enclaves occur in the porphyritic granite of the Machangqing complex.Major elements,trace elements and Pb isotope compositions of enclaves and their host rocks have been analyzed.The characteristics of major and trace elements show that enclaves are genetically related to host rocks.Pb isotope results indicate that enclaves and host rocks may derive from the lower crust and EM Ⅱ.Based on above results and the petrographical features,the magma mixing genesis of the enclaves was determined.Dark enclaves in the Machangqing complex can supply credible geological evidence to reveal the origin of the alkali-rich magma,deep geodynamics and the relationship between rock and ore-forming process.It indicates that the Machangqing complex may be the production of mixing of crust-derived and mantle-derived magmas and that the mantle-derived magma may supply the main ore-forming materials.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2012年第5期479-488,526,共11页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展计划资助项目(2009CB421000)
武警黄金指挥部专项基金资助项目(HJ09-03)
关键词
暗色包体
岩浆混合作用
马厂箐岩体
滇西
dark enclave
magma mixing
Machangqing complex
western Yunnan
