安徽黄梅尖地区铀成矿地质特征与控制因素研究

Study on Geological Characteristics of Uranium Mineralization and Control Factors in Huangmeijian Area,Anhui Province

黄梅尖地区位于安徽省庐枞火山岩盆地东南缘,是安徽省铀矿找矿最具潜力的地区,以往工作发现了丁家山铀矿床、徐村铀矿床和众多的铀矿点,控制的铀金属资源量达到中型规模。文章较详细地阐述了黄梅尖地区铀成矿地质特征,探讨了成矿控制因素,提出了后续勘查工作的建议。研究认为,主要铀矿床(点)控制因素受燕山晚期石英正长岩体、侏罗系有利含矿岩性、近东西向构造和蚀变等联合控制,特别是岩体与近东西向构造夹持地带岩体产状变异部位的侏罗系罗岭组(J2l)和磨山组(J1m)砂岩是铀矿化有利部位,铀矿化类型为与碱性岩有关的岩浆热液型。建议丁家山铀矿床西侧和黄梅尖岩体南缘周潭-田埠地带应作为下一步找矿工作的首选地段。

Huangmeijian area is located in the southeastern margin of the Luzong volcano rock basin in Anhui province,is the most potential uranium prospecting area in Anhui province.Xucun and Dingjiashan uranium deposit and numerous uranium occurrences are found by the previous work,the controlled uranium metal resources amountes to medium scale.This paper describes in detail the geological characteristics of uranium mineralization in Huangmeijian area,discussed the ore control factors,puts forward suggestions for future exploration.The main controlling factors of uranium deposits （point） include quartz syenites in the late Yanshan,Jurassic favorable orebearing lithology,nearly E-W structure and alteration control,especially the Jurassic LuoLing group （J2l） and Millshan group （J1 m） sandstone of rock occurrence mutation sites of the rock mass and nearly E-W structure clamping strip are favorable positions of uranium mineralization,types of uranium mineralization are magmatic hydrothermal type related to alkaline rocks.It is suggested that the West of Dingjiashan uranium deposition and Zhoutan-Tianbu zone of southern Huangmeijian rock mass should be as the preferred site of the next step prospecting work.