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０１～０２ＧＰａ。形成温度约８６６～１１５０℃，氧逸度ｌｏｇｆＯ２平均为－１０９７。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.
出处
《现代地质》
CAS
CSCD
北大核心
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
关键词
成因类型
岩浆演化
中生代
侵入岩
花岗岩
genetic types, magma evolution, the Mesozoic intrusive rock, Jinzhai Suxianshi area of Beihuaiyang
