火山碎屑岩的分类和命名(国内推荐方案)

Classification and Nomenclature of Volcaniclastic Rocks

为了加强火山岩地区的区域地质调查、找矿勘探,以及资料对比和综合研究工作,统一分类方案和命名原则是非常必要的。目前我国在不同范围内使用过的火山碎屑岩的分类方案较多,这些方案虽然具体划分还存在不少差别,但在一些基本方面有共同点或者比较接近,因此本着求大同存小异的精神,在实践中逐步统一分类命名的大界线。

During the symposium in Beijing(1983),the Group on the systematics of Volcanic Rocks of the Commission on Petrology of the Geological Society of China agreed on recommendations on the classification and nomenclature of volcanic rocks,which were suggested by Li Zhaonai et al.(Institute of Geology,Chinese Academy of Geological Sciences,1983)[4]and use for China.The classifications and nomenclatures consist of three parts,namely the basic scheme(Table 1),applied to laboratory work;the simplified scheme(Table 2),corresponding to the recommended scheme of the IUGS Subcommission on the Systematics of Igneous Rocks(R.Schmid,1981),applied to field work;the principles of nomenclature.The geological features of the various types of volcanic rocks are systematically described in the Bulletin No.7 of the Institute of Geology,Chinese Academy of Geological Sciences.