Types and intrusion times of granitoid rocks in Southern Xizang have been distingui.shed by diseriminatory and cluster analyses. By means of regression analyses
Discussed in this paper are the regularities governing the prevalence of Keshan disease and its relationship te the local rock type, soil, vegetation, climate a
The geographical distribution and physical properties of Qionglei tektites from South China are described in the present paper. 12 samples of Qionglei tektites