国内外火山碎屑岩的分类命名历史及现状

1981年国际地科联火成岩分类分会委托瑞士学者施米德提出的那个分类表比较简明,但还有些问题值得商榷。50年代末笔者提出了国内第一个岩性分类表。近30年来,充分吸取了国内外学者分类表的优点,在实践中不断修改充实,最近又提出了一个修订的岩性分类表,尚需进一步完善。当前火山碎屑岩分类命名由岩性分类重点转向成因分类。我们参考了国内外学者有关成因分类的新见解,初步提出了一个火山碎屑岩成因分类方案,以供大家讨论。

A REVIEW OF NOMENCLATURE OF PYROCLASTIC ROCK CLASSIFICATION AND ITS PRESENT STATUS BOTH ABROAD AND AT HOME

Entrusted by the IUGS subcommision on the systematics of igneous rocks, R. Schmid, a Swiss, presented a new classification system in 1981. Although it is quite simple and clear. improvements for this classification are required because of its shortcomings. In China, the first lithological classification on pyroclastic rocks was presented by Sun shanping ( 1959) . Recently the authors have proposed a revised lithological classification table, which has benefited from both the advantages of all the previous classification in the literature and the judgements on our original classification upon the past thirty years of practice. At present the volcanologists and igneous petrologists seem to focus their attention on establishing petrogenetic classification of pyroclastic rocks.Referring to the new ideas of the others, we have proposed a preliminary petrogenetic classification framwork on pyroclastic rocks.