| Abstract: | This paper sums up briefly that the content of rock-forming components, ore-forming element ( tungsten ) , and the minor elements as well as some physico-chemical conditions during magmatic crystallization are diffenent between the productive, ore-bearing and barren granites in this region. On the basis of the above mentioned results, the authors suggested geochemical criteria or signatures for evaluation of the ore-bearing potentiality of the Mesozoic granitic intrusions as follows: (l) the K/Na ratio and tungsten abundance of the granites, (2) H2O+ content in the whole rocks, (3)H2O+ and WO3 contents in the biotites, (4) the abundances and the statistical parameters of some minor elements, and the discriminant functions based on the element contents, (5) the variation ranges of the tungsten content, the pressure and the oxidation intensity during magmatic fractional crystallization. |
