The regional stratigraphy composed mainly of pre-Sinian gneisses migmatizationized to raring extent. Basic complexes, consisting largely of anorthosite andmeasu
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