大兴安岭红山子盆地铀矿勘查新进展及其找矿意义  

Exploration Progress of Hongshanzi Basin in Daxinganling and its Prospecting Significance

作　　者：祝洪涛[1] 李继木 赵博[1] 王常东[1] 

机构地区：[1]核工业二四三大队,内蒙古赤峰024000

出　　处：《东华理工大学学报（自然科学版）》2014年第4期360-366,共7页Journal of East China University of Technology(Natural Science)

摘　　要：通过2010—2012年开展的新一轮铀矿补充勘查和基础地质研究,确认了沽源-红山子铀成矿带红山子盆地的含矿火山岩以高钾钙碱性流纹岩-碱性流纹岩组合为特征,属晚侏罗世早期新民组,发现铀钼矿体主要受NE向推覆构造控制,成矿期热液蚀变属碱交代型。红山子盆地赋矿火山岩的岩石组合和地质时代,与早白垩世早期高钾钙碱性流纹岩-碱性粗面岩组合为特征的沽源盆地张麻井铀钼矿床的赋矿围岩明显不同,是沽源-红山子铀成矿带一个新的找矿层位;红山子铀钼矿床的控矿构造和热液蚀变特征,也不同于具有"上酸下碱"蚀变规律、矿体赋存在流纹斑岩与流纹岩接触带附近的张麻井铀钼矿床,一方面证实断裂构造在铀矿体定位中具有控制作用,另一方面暗示红山子盆地抬升剥蚀程度较大、保矿条件不好,指示沽源-红山子铀成矿带铀矿靶区的圈定应注意保矿条件的分析。The complemental exploration and basic geological study in 2010—2012,confirmed that the ore-bearing volcanic rocks are characterized by alkalic rhyolite-high-potassium calc alkalic rhyolite rock association,it belongs to Xinmin formation Late Jurassic,and found that the uranium molybdenum ores are controlled by NE nappe structure,mineralization period hydrothermal alteration is an alkali metasomatism one.The rock association of orebearing volcanic rocks and geological age of Hongshanzi basin is different with Guyuan Zhangmajing molybdenumuranium deposit which is characterized by early Early Cretaceous high-potassium calc alkalic rhyolite-trachyte rock association,and it＇s a new horizons for prospecting of Guyuan-Hongshanzi uranium molybdenum metallogenic;the ore-controlling structure and hydrothermal alteration are also different with Zhangmajing molybdenum-uranium deposit which has the law of alteration “ acid in the upper part,and alkaline lower part” and its orebody is occurrenced in the contact zone between rhyolite porphyry and rhyolite,it proves that the orebody＇s location is controlled by the fault structure,on the other hand it hints the degree of uplift denudation in Hongshanzi basin is great and its ore preserving condition is poor,suggest that the analysis of ore preserving condition should be noticed at delineated target areas in Guyuan-Hongshanzi uranium molybdenum metallogenic..

关 键 词：铀矿勘查 推覆构造 高钾钙碱性流纹岩-碱性流纹岩组合 红山子盆地 

分 类 号：P619.14[天文地球—矿床学]