诸广岩体南部长排铀矿床勘查模式与找矿预测

长排铀矿床位于诸广岩体南部长江铀矿矿集区中部,区域上处于岩浆岩带、断陷带、深大断裂交会区和华夏古陆隆起与凹陷的交会部位,成矿地质背景有利。区内多期次岩浆活动和白云母化、绿泥石化、绢云母化等多种蚀变叠加,北北西向含矿断裂发育,成矿条件优越。通过对该矿床勘查成果的总结和成矿预测研究,认为长排铀矿床由小型到大型的突破,是在开拓找矿思路、创新找矿方法、总结前人找矿经验和棉花坑矿床成矿模式,以及建立区内地质、物探、化探"三位一体"勘查模式的基础上取得的。进一步分析区内构造、蚀变、岩性界面、成矿热液活动及铀成矿环境等控制因素,提出含矿断裂带膨胀、分支复合、多期次热液蚀变叠加等部位为成矿和赋矿的有利部位,结合物化探测量成果,预测矿床南部长坑地段60、78号带和水石地段71、73、86号带等成矿条件好,其深部有较好的找矿前景。

Exploration model and prospecting prediction of the Changpai uranium deposit in southern Zhuguang rock mass

The Changpai uranium deposit is located in the central part of the Yangtze River uranium deposits in the south of the Zhuguang rock mass. It is at the intersection of the magmatic rock belt, the fault depression zone and the deep fault intersection, as well as the intersection of Cathaysia uplift and depression, which is favorable for mineralization. There are many multi-stage magmatic activities overlapping with muscovitization, chloritization, sericitization and other alterations in the area. The NNW-trending ore-bearing faults are developed with superior ore-forming conditions. With summary of mineral exploration and metallogenic prediction, it is believed that the Changpai uranium deposit could transform into a large deposit, which is thanks to new ideas for prospecting, innovative new prospecting methods, the prospecting experience of former studies and mineralization of the Mianhuakeng deposit. The model was established on the basis of integrating geology, geophysical exploration and geochemical exploration in the region. This paper furthers the analysis of regional structure, alteration, lithologic interface, ore-forming hydrothermal activity and controlling factors of uranium metallogenic environment, and considered mineralization fault zone expansion, branch reunion, multi-stage hydrothermal alteration superposition as the metallogenic favorable areas. Regarding the result of geophysical and geochemical exploration, the paper predicts that the deep parts of the two belts (No.60 and No.78) in the Changkeng section and three belts (No.71, No.73 and No.86) of the Shuishi section in the southern part of the deposit have good prospecting prospects.