华南某地浸染型锯、钽花岗岩原生晕找矿的探讨

勘查地球化学作为一种找矿手段在寻找硫化多金属矿床方面日臻完善,应用愈益广泛并取得了令人满意的效果。然而对于浸染型铌、钽花岗岩矿床的地球化学找矿论述较少。事实上,此类矿床Nb、Ta矿物的颗粒细小,肉眼无法看到,除直观的地球化学找矿标志外,岩石地球化学找矿法和重砂法(即矿物晕法)是寻找和评价这类矿床的重要手段。

TENTATIVE GEOCHEMICAL ROCK SURVEY IN ANIMPREGNATION TYPE Nb-Ta GRANITE TERRAIN OFSOUTH CHINA

Primary dispersion halos from a impregnation type Nb-Ta granite in Hunan have been dealt with in this paper. Using Nb, Ta, W, Sn, Be, Li, Rb, Cs as indicator elements, the author has successfully detected ore anomalies and then delineated ore bodies. As evolution of elements finds expression in ore body associations, abundance of minerals and variations in typomorphic minerals, mineralogical features such as mineral halos and characters of typomorphic minerals seem likely to furnish their own information for ore detection. Vertical zoning of primary halos suggests that, in locating ore bodies, Li, Rb, Cs, Bi, Aa may be used as distant indicator elements whereas Nb, Ta, Be serve well as near-ore indicator elements.