中国东南部中生代含铀花岗岩成岩物质来源与铀成矿作用

The Material Source and Mineralization of the Mesozoic Uraniferous Granitic Rocks in the Southest of China

几年来野外实地调查和室内大量的实际资料表明,我国东南部中生代含铀花岗岩体大多数属原来大陆壳硅铝层浅海相陆源沉积岩和火山沉积岩,以及少量的花岗岩等物质在深部增温增压下经受重熔作用而产生的酸性岩浆侵入于距当时地表约为2—4公里深处,经过充分而完善的结晶分异作用和射气分异作用而导致的产物。为了进一步阐明和解释含铀花岗岩成岩物质来源与铀成矿作用之关系,作者在本文里试图首先对含铀花岗岩成岩物质来源进行探讨,在此基础上提出对铀成矿作用的不成熟看法。

On the basis of the field observations and laboratory works in recent years, the author has an attempt to discuss the relationship between the material source of uraniferous granitic rocks and uranium-mineralization. The mesozoic uraniferous granites in the southeast of China are formed by partial remelting and palingenesis of continental crust type sediments, volcano-sediments and small numbers of original granite under the condition of increasing temperature and pressure in the tectonic acts. In this paper the author explained chiefly the characteristics of material source of uraniferous granitic rocks from the following ten respects:1)the association of granitic rocks? 2) the petrochemical composition of granitic rocks? 3) the composition of biotites? 4) Th/U ratio;5) the accessory minerals;6) the trace elements;7) volatile compositions;8) the distribution patterns of the rare earth elements;9) the composition of stable isotops and 10) the temperature for formation of granites.