晚期小岩体归宿及其在找矿中的意义初探

本文提出了晚期小岩体不是花岗岩浆演化的产物,而是相当于超浅成的次火山岩。由于它与铀成矿关系密切,因而花岗岩型铀矿与火山岩型铀矿成矿机理相同。对比火山岩中两大系列铀矿,即与次火山岩有关的早期铀矿和与红盆发生发展有关的晚期铀矿,认为花岗岩中也应有相应的两期铀矿。今后找富矿、找深部矿时应注意寻找早期铀矿。同时根据花岗岩中面型蚀变体的存在,推论在面型火山岩铀矿深部应寻找次火山岩型铀矿。

PRELIMINARY DISCUSSION ON THE ATTRIBUTION OF LATE STAGE SMALL MASSIFS AND THEIR SIGNIFICANCE IN PROSPECTING

This paper presents that late stage small massifs are not the products of evolution from granitic magma,but correspond to extremely shallow subvolcanic rocks. As they are closely related with uranium metallogenesis,the ore-formation mechanism of granite-type uranium deposit and volcanic type uranium deposit are just the same. As compared with two big series of uranium deposits in volcanic rocks,that is,the early stage uranium deposits associated with subvolcanic rocks and the late stage uranium deposits associated with the occurrence and development of red basins,it is considered that there should have two corresponding stages of uranium deposits in granite. Therefore,from now on attention should be paid to the prospecting for early stage uranium deposits while searching for rich and deep, uranium de-posits. At the same time,according to the existence of areal alteration bodies,it is deducedthat we should look for subvolcanic rock type uranium deposits at the depth of areal volcanic uranium deposits.