In country, Bi xianmei, Suo shutian, etc. can only estimate the temperature and stress interval of this metamorphism and centigram the upper and lower limit by mensurating the crystallinity and other maturity degree parameters of illite, mica, and chlorite, etc. in slate.
在国内，毕先梅、索书田等人，通过测定板岩中伊利石、云母、绿泥石等矿物及多形矿物的结晶度和其它成熟度参数，可大致判断极低级变质作用的温度、压力区间，厘定极低级变质作用的上、下限。