风化店中生界火山岩的归属问题及岩石类型

Research on the Origin of Mesozoic Volcanic Rocks in Feng Huadian Area

认为风化店中生界火山岩呈层状分布，其间夹火山碎屑岩和沉积岩夹层；岩石的气孔及流纹构造发育，矿物学特征显示出喷出岩中矿物所具有的特征；岩石的氧化度较高，Ｆｅ＿２Ｏ＿３／（Ｆｅ＿２Ｏ＿３＋ＦｅＯ）平均为５３．５０％，ＳｉＯ＿２的含量平均为６８．４６％。根据岩体地质特征、岩石学及岩石化学等证据，认为绝大部分岩石属于钙碱性酸性火山喷出岩，只有少部分为偏碱性中性或偏碱性中酸性火山喷出岩。岩石类型主要为英安流纹岩、流纹英安岩、流纹岩和碱流岩。

The Mesozoic volcanic rocks in Feng Huadian area are stratified and the characteristics ofthe acidic and intermediate-acidic eruptive rocks studied.A new view on the iditification of the rocks isthen advanced.