中川地区的铀迁移特征及铀矿找矿有利地段分析

Analysis on the characteristics of the uranium enrichment migration and the beneficial sites of uranium ore prospecting in Zhongchuan area

为了查明中川地区铀元素在地化作用下相对富集的情况及找矿有利地段,利用航空伽马能谱资料对区内古铀、活性铀的分布及铀的迁移规律进行分析,并运用异常叠加量和富集系数等参数对区内地层(体)的含铀性和资源量作了探讨,还运用Ur值、铀钍比值和铀衬钍衬比值等参数,对中川地区的不同岩体的含铀性进行对比研究。最终,将中川地区各地层(体)划分为富铀源富集体、富铀富集体、贫铀源富集体、贫铀富集体,其中富铀源富集体的地层(体)最有利于成矿;通过对中川地区的不同岩体的含铀性对比,认为中川岩体的含铀性较好,为铀性岩体,其它为钍性岩体;指出各岩体内大的构造破碎带、岩体外接触带以及盆地边缘是活性铀的主要富集区,区内铀增量与活性铀叠加复合地段是铀矿找矿的有利地段。

In order to find out the relative enrichment of uranium in the Zhongchuan area and the advantageous sites of uranium mine prospecting under the action of geochemical’this paper mainly analysis the distribution of original uranium and activated uranium and the migration characteristics of uranium by using of airborne gamma spectrometric d ata’which has discussed the uranium content and endowment of the strata(terrane)by using the parameters such as the abnormal superposition and the enrichment coefficient’and comparatively studied the uranium content of different rocks in zhongchuan area by using the parameters including the U r’the uranium-thorium ratio and the uranium-thorium lining ratio.Finally’it classifies the strata and terrane into uranium-rich source concentration body’uranium-rich concentration body’uranium-poor source concentration body and uranium-poor concentration body’and uranium-rich source concentration body is the most favorable for mineralization.By comparing the uranium content of different rocks in zhongchuan area’it is believed that the uranium content of the Zhongchuan rock is better.The Zhongchuan rock is a uranium rock’and the rest are thorium rock;it points out that the main enrichment areas of activated uranium include the structure broken zone’ex-contact zone and the edge of the basin.The superimposed compounding area of uranium increment and activated uranium is the most favorable for mineralization.