相山铀矿田沙洲矿床地质特征及找矿潜力

Geological Characteristics and Prospecting Potential of Shazhou Deposit in Xiangshan Uranium Ore Field

为进一步扩大沙洲矿床深部及外围的找矿成果,开展野外地质调查、岩矿鉴定、电子探针及地球化学分析,研究铀矿体的分布特征、矿石矿物及地球化学特征等,总结控矿因素,分析找矿潜力。结果表明,铀矿体整体呈北西西向展布,倾向南西,倾角为60°~70°,以脉型、群脉型为主。铀矿石中铀矿物主要有沥青铀矿、铀黑、磷铀矿、钛铀矿等;伴生矿物有方解石、黄铁矿、方铅矿、闪锌矿、磷灰石、萤石等。铀矿石中U含量与CaO、P_(2)O_(5)、Na_(2)O、Fe_(2)O_(3)含量呈明显正相关,与SiO_(2)、K_(2)O含量呈明显负相关。铀矿体的控矿因素主要为岩性接触界面和断裂构造。在10-12线附近发现了矿化富集区,矿化往深部延伸有规模变大、品位变富的趋势,沙洲矿床深部及南部外围可作为今后找矿的重点方向。

In order to further expand the prospecting achievements in the depth and periphery of the Shazhou deposit,field geological surveys,rock and mineral identification,electron microprobe and geochemistry analysis have been carried out to study the distribution characteristics of uranium ore bodies,ore minerals and geochemistry characteristics,ore-controlling factors and the prospecting potential.The results show that the uranium ore bodies are distributed in NW direction,dip to SW,dip angle from 60°to 70°,and mainly vein type and group vein type.Uranium minerals in uranium ore mainly include pitchblende,uranium black,uranophosphite,titanite and so on.Associated minerals are calcite,pyrite,galena,sphalerite,apatite,fluorite and so on.The U content in uranium ore is positively correlated with the contents of CaO,P_(2)O 5,Na_(2)O,and Fe_(2)O_(3),and negatively correlated with the contents of SiO_(2)and K_(2)O.The main ore-controlling factors of uranium orebody are lithologic contact interface and fault structure.The mineralization enrichment area was found near the 10-12 line.The depth and the southern periphery of the deposit may be the main prospecting direction in the future.