Two stages of intrusion have been recognized for Paleozoic pegmatites in this district. The pegmatites occur as several thousands of dikes, with 84 per cent of
This paper gives a description of high-temperatUre contact metamorphism at the contact of some Alpine-type ultrabasic intrusions in the Mian-Luee region of the
The major concern of this paper is with allophane(m Al2O3.n SiO2.p H2O),a colloid mineral from a certain locality in China,which is surperfaeial in origin and m