火成角砾岩的三级分类

A THREE-LEVEL NESTED CLASSIFICATION SCHEME OF PYROGENIC BRECCIA

基于多年从事火成角砾岩研究的成果,推出一个新的火成角砾岩分类。此方案是以主岩体定位深度为主导（A级）,以胶结物类型及胶填方式（B级）和角砾/粗碎屑含量（C级）为羽翼的三级分类;A、B、C各级/各组自成系统,均可单独使用,亦可三者联合或两两联合使用。该方案既避免了以往分类前提混乱的通病,互相之间组合关系又合乎逻辑。它可直接用于野外找矿评价,也可反演之而用以判别其主岩体之形成深度,还可用之于成矿环境的评估。

Based on the achievements of the special project (1991 ~ 1998) concerned with pyrogeiiic breccia carried out by the authors, a new classification scheme about pyrogenic breccia is recommend here. The scheme is made up of three systems called as level A, B and C, among which level A is classified based on emplacement depth of the mother rock bodies of the breccia; level B on types of cementing materials and their filling modes and level C on compositions and contents of rubbles (coarse fragments) of the breccia. Each system has its own taxonomic premises and can be applied independently. The classification is particularly suitable for prospecting of ores, identifying of emplacement depth of mother intrusions of the breccia, and evaluation of metallogenic conditions, providing a unique way for geological reconnaissance and survey in volcanic and granitoid areas.