下庄铀矿田控矿因素光-能谱融合图像解译应用研究

APPLICATION RESEARCH OF FUSION IMAGES OF TM AND AIRBORNE γ_SPECTRA DATA ON THE METELLOGENIC CONTROL FACTORS IN XIAZHUANG URANIUM OREFIELD

通过光 -能谱融合图像处理、解译与部分野外验证 ,对下庄铀矿田发育的钾化蚀变带和低钍补体进行了识别与提取 ,指出铀成矿与钾化蚀变断裂带及低钍补体具有密切的成因与空间联系。另外 ,以能谱图像上发现的环状影像为线索 ,通过对岩体主体固结成岩后穹状构造隆升事件的研究 ,认为本区曾存在地幔柱 ,地幔柱作用引发了多种地质事件 (或作用 ) 。

On the basis of processing, interpretation and field inspection of fusion images of TM and airborne γ_spectra data, the potash_alteration zones and low_thorium secondary granitic intrusions are recognized and their distribution information are extracted in Xiazhuang uranium orefield. It is proved that the uranium metallogenesis has close genetic and spatial relationship with potash_alteration fault zone and low_TH secondary intrusion. In addition, according to clue of ringed image and based on researching into the event of dome structure uplift that generated after major intrusion consolidation, it is pointed out that the mantle plume had been existed in this region. The mantle plume tectonic process caused a series of geological processes and it is the essential background for forming the uranium orefiled.