黑龙江奋斗地区地面伽玛能谱异常特征及成因分析

Anomaly characteristics and genesis analysis of ground gamma energy spectrum in Fendou area,Heilongjiang

黑龙江萝北县奋斗地区位于近南北向牡丹江断裂东侧,分布北北东向航放铀高场。为查明奋斗地区航放铀高场的成因及铀成矿潜力,通过对该区地面伽玛能谱数据进行统计分析,以3、+3Sd、+2Sd、+Sd为标准对地表异常信息进行了分级、分类,详细阐述了铀、钍元素异常特征,综合分析了异常成因。研究区异常受花岗片麻岩体、北西向断裂构造的复合控制,花岗伟晶岩脉为铀、钍元素再富集提供了有利的热源和物源条件,成矿潜力较好。

The Fendou area in Luobei county, Heilongjiang Province, located in the eastern the Mudanjiang fault, where the NNE-trending high uranium field of airborn radioactivity exists.On the basis of statistic analysis of the ground gamma date in the Fendou area, The surface anomaly information is rated and classified by the standard of 3X^-, X^-＋3Sd, X^-＋2Sd and X^-＋Sd. Then the spectral anomaly characteristics of the uranium and thorium are described in detail and the anomaly genesis is analyzed comprehensively. The ground gamma energy spectrum anomaly in the study area is controlled by granitic gneissic and the NW-trending faults, and the granit- ic pegmatite veins provide favorable heat and provenance for uranium and thorium re-enrichment.