北淮阳金寨—苏仙石地区中生代花岗岩的成因类型及岩浆演化特征  

THE GENETIC TYPES AND MAGMA EVOLUTION OF THE MESOZOIC GRANITOID IN JINZHAI SUXIANSHI AREA, BEIHUAIYANG

作　　者：李家振 张爱民[1] 

机构地区：[1]中国宝石编辑部

出　　处：《现代地质》1997年第2期253-260,共8页Geoscience

基　　金：1:5万苏仙石幅;金寨县幅区调项目

摘　　要：北淮阳金寨—苏仙石地区中生代侵入岩出露面积约１５０ｋｍ２，按岩石谱系单位的划分原则，可分为３个超单元（包括１０个单元）和３个独立单元。根据主要造岩矿物及副矿物组合、岩石化学和地球化学特征判别结果，岩体成因类型以Ｉ型为主，少数为Ａ型和Ｓ型。岩浆来源约３０ｋｍ深处，相当于下地壳或壳幔过渡部位。岩体形成深度约３～４ｋｍ，压力约０１～０２ＧＰａ。形成温度约８６６～１１５０℃，氧逸度ｌｏｇｆＯ２平均为－１０９７。进一步讨论了岩浆的水逸度、水压及岩浆密度。The Mesozoic intrusive body growing in Suxianshi Jinzhai area of Beihuaiyang stretches at about 150km 2. The intrusive body can be grouped as 3 super units (include 10 units) and 3 independent units based on the intrusive spectra units deviding principle. According to its main rock forming mineral, accessory mineral formation,petrochemistry and geochemistry character, it shows that I type is the main genetic type for intrusive, only a few is A Type or S type. The magma origin depth is about 30km, which is equal to the lower crust or crust mantle transition zone. The intrusive forms depth is about 2～3km, the pressure is about 0 1～0 2GPa, the temperature is about 866～1150℃, the average oxygen fugacity is -10 97. The magma′s water fugacity, water pressure and magma density, the magma evolution and the genetic relationship between intrusive rock and volcanic rock, are also discussed.

关 键 词：成因类型 岩浆演化 中生代 侵入岩 花岗岩 

分 类 号：P588.121[天文地球—岩石学] P581[天文地球—地质学]