摘要
企岭岩体属于南岭花岗岩。侵入海西和燕山早期花岗岩及寒武纪浅变质岩系,与围岩接触界线明显。同位索年龄141—162Ma。岩性为二云母花岗岩,为碱质含量高、富钾、铝过饱和的酸性岩石。^(87)Sr/^(86)Sr初始值为0.7162、δ^(18)O为11.90‰,∑REE含量为177.78 ppm,其稀土模式与寒武纪浅变质岩的稀土模式相似。岩体形成温度560—710℃,水气压118×10~6—17×10~7Pa,氢逸度316×10~2—1259×10~3Pa,氧逸度10^(-16)—10^(-17-5)atm(1atm=101325Pa),水逸度79433×10~3—80895×10~3Pa,成因类型属陆壳改造型。
The paper discusses geological, petrologic and geochemical characteristics of the Qiling granite. Based on extensive field observations and laboratory tests and a comprehensive study, it is' proposed that the granite belongs to the genetic series of terrestrial crust transformation type.The Qiling granite body belongs to the Nanling granites. It is intruded intothe Hercynian and early Yanshanian granites and Cambrian low-grade metamor-phic rock series, showing distinct contact relationships with country rocks. It occursas a batholith. Its Isotopic age is 141-162 Ma. The initial ^(87)Sr/^(86)Sr ratio is 0.7162, δ^(18)O=11.90％, ΣREE=177.78 ppm, and its REE pattern is similar to that of Cam brian low-grade metamorphic rocks. It is lithologically. two-mica granite, with the chemical formula: K_(63) Na_(52) Ca_(10) Mg_8Fe_(14)^(2+) Fe_2^(8+) Al_(142) Ti_2 Si_(638) P_2O_(1589) OH_(11). It belongs to alumina-oversaturated, acid rocks with a high content of alkalis, particularly potassium. Its formation temperature ranges from 560-710℃, barometic pressure=118×10~6-17×10~7 Pa, hydrogen fugacity=316×10~2-1259×10~3 Pa, oxygen fugacity=101325×10^(-10)-101325×10^(-11.5) Pa, and watter fugacity=79433×10~3-80895×10~3 Pa.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第5期448-455,共8页
Geological Review
