一、绪言 现在所采用的各种球粒陨石分类体系和命名法,没有一种是十分令人满意的。问题在于这些分类体系几乎完全是根据球粒陨石化学上的差别,而没有考虑到球粒陨石的特性不单单取决于其化学成分这个事实。许多球粒陨石尽管其在矿物、结构和成因方面是不同的,但在化学成分上却是相同的。这些差别的重要性在地质学中一向是公认的,于是不同的岩石分类法便提出来了。 I. INTRODUCTION Nowadays, none of the chondrites classification system and nomenclature used are very satisfactory. The problem is that these classification systems are based almost entirely on the chemical differences of chondriosomes without regard to the fact that the chondrule meteorites do not depend solely on their chemical composition. Many chondrites, although different in mineralogy, structure and genesis, are chemically identical. The importance of these differences has always been recognized in geology, so different rock taxonomies are proposed.