自二十世纪六十年代以来,国内外一些单位和学者相继对沉积岩、泥质灰岩、炭质板岩以及绿片岩等的Rb—Sr年龄测定做了不少工作,积累了较多的资料,取得了一定的成果。本文作者于1976年便开展了海南岛石碌群中浅变质岩系的Rb—Sr年代学研究。然而,由于沉积岩和原岩为沉积岩的中浅变质岩系中Sr同位素均匀化的机理及其控制因素、Rb—Sr等时线斜率对应的年龄值的地质意义等尚未很好弄清;化学风化作用易于导 Since the 1960s, some units and scholars at home and abroad have done a lot of work on Rb-Sr dating of sedimentary rocks, argillaceous limestone, carbonaceous slate and greenschist, and have accumulated a lot of data , Has achieved some results. In 1976, the author carried out the Rb-Sr chronology of the shallow metamorphic rocks in Shilu Group, Hainan Island. However, the geologic significance of the age value corresponding to the Rb-Sr isochron slope has not been well understood because of the mechanism and controlling factors of the homogenization of Sr isotopes in the medium- and low-grade metamorphic rocks of sedimentary rocks. The chemical weathering The role of easy to guide