黑龙江省磨石山火山盆地滚子沟地区铀矿化特征及其地质意义

MINERALIZATION CHARACTERISTICS AND GEOLOGICAL IMPLICATION OF THE URANIUM DEPOSITS IN GUNZIGOU AREA OF MOSHISHAN VOLCANIC BASIN,HEILONGJIANG PROVINCE

磨石山火山盆地位于宾县-伊春-甘欣(俄)火山岩型铀钼成矿带中部,为白垩纪中-小型火山盆地.盆地北部的滚子沟地区新发现一铀矿化异常区,矿化异常区内存在一条铀异常带及两处铀异常高值点.在综合该异常区地质和矿化特征基础上,结合区域大地构造背景、区域地层、侵入体和构造等地质特征,通过对滚子沟地区铀异常成矿条件和控矿因素的分析,认为该异常区内赋矿岩性为早白垩世宁远村组碎裂流纹岩,主体受到北北东向断裂控制,蚀变类型主要为硅化和赤铁矿化,具明显分带性.与区域产铀火山盆地对比分析显示,磨石山火山盆地具有更优越的成矿前景.可依据滚子沟地段归纳的铀矿化特征,在火山盆地内进行铀矿调查工作.

The Moshishan volcanic basin,located in the middle of the Binxian-Yichun-Gansin volcanic-type uraniummolybdenum metallogenic belt,is a small-medium sized Cretaceous volcanic basin. A uranium mineralization anomaly is newly discovered with one anomaly belt and two high anomaly points in Gunzigou area in the north of the basin. Based on the geological and mineralization characteristics,combined with regional tectonic setting,stratigraphy,intrusive rocks and structures,by analysis on the metallogenic condition and ore-controlling factors,it is thought that the host rock occurred in the anomaly area is cataclastic rhyolite of Ningyuancun formation,Early Cretaceous,controlled by the NNE-trending fault. The main alteration types are silicification and hematitization with obvious zonation. The comparative analysis with regional uranium-productive volcanic basins shows that Moshishan volcanic basin has greater mineralization prospects. According to the uranium mineralization characteristics in Guizigou area,further uranium prospecting in volcanic basins can be carried out.