摘要
卡房火山岩产于中三叠统个旧组的碳酸盐岩夹层中.有变橄榄玄武岩、变杏仁状玄武岩、变玄武岩和凝灰岩.化学组成特征是 SiO_2,偏低富碱(K_2O>Na_2O),较富含 Cr,Ni,Co,V,Ti 及 Cu,W,Sn,Bi,Pb,Zn 等元素.δ^(34)s‰为1.26属陨石型.蚀变后岩石有金云母岩,金云母阳起石岩等.部分蚀变岩成为富含 Cu、Sn 的矿体,火山岩归属碱性玄武岩系列,形成于弱造山带环境,为印支期喷发产物,岩浆来源深度大于40km.
Guo-ju Ka-fan volcanic rocks in the middle Triassic Guo-ju formation.There were basalt almond-shape basalt and tuff there.The chemical compositions of the volcanic rock is the lower SiO_2and the higher alkali rock(K_2O>Na_2O).It belongs to the alkali-basalt series,which is formed in Indo-China epoch.
关键词
火山岩
地质
地球化学
个旧
Volcanic rock
Geology
Geochemistry
Guo-ju
