冀北窟窿山火山岩型铍矿化的发现及其地质意义  

Discovery and prospecting potential of volcanic beryllium mineralization in Kulongshan,northern Hebei Province

作　　者：陈振宇[1] 李胜利 李晓峰 潘硕 张兴康 李建康[1] 孙艳[1] 朱艺婷 CHEN ZhenYu;LI ShengLi;LI XiaoFeng;PAN Shuo;ZHANG XingKang;LI JianKang;SUN Yan;ZHU YiTing(Key Laboratory of Metallogeny and Mineral Assessment,Ministry of Natural Resources,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Hebei Provincial Geological Survey Institute,Shijiazhuang 050051,China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Science,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]自然资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037 [2]河北省地质调查院,石家庄050051 [3]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029 [4]中国科学院大学地球与行星科学学院,北京100049

出　　处：《岩石学报》2022年第7期1901-1914,共14页Acta Petrologica Sinica

基　　金：国家重点研发计划项目(2019YFC0605203);中国科学院地质与地球物理研究所重点部署项目(IGGCAS-201902)联合资助.

摘　　要：冀北窟窿山地区发育一套早白垩世火山-浅成侵入岩系,其中的碱长花岗岩及其围岩流纹斑岩的地球化学特征,指示它们都属于A型花岗岩,形成于板内伸展拉张构造背景。最近在该地区发现多处与流纹斑岩、碱长花岗岩有关的铍矿化。野外调查和室内分析发现,铍矿化主要产于碱长花岗岩的蚀变带中,与铁锰矿化和铅锌矿化密切相关。蚀变岩中同时伴有Rb、Nb、Pb、Zn的矿化。铍矿物以日光榴石、硅铍石为主,含少量羟硅铍石。该研究区位于沽源-红山子铀成矿区,且已发现多处铀矿化带,因此推测该地区成矿类型是火山岩型Be-U矿床。窟窿山地区具有与东南沿海火山-侵入岩铍成矿带相似的岩石类型、形成时代、构造背景及铍矿化特征,具有非常好的Be、U、Nb及Pb、Zn等多金属矿找矿潜力,应加强相关的地质找矿勘查工作和成矿机制研究。There is a series of Early Cretaceous volcanic-shallow intrusive rocks in the Kulongshan area of the northern Hebei Province.The geochemistry of the alkali-feldspar granite and the rhyolitic porphyry in the Kulongshan massif indicate that they are typical A-type granite and formed in an extensional tectonic setting within the plate.Recently,beryllium mineralization associated with rhyolitic porphyry and alkali feldspar granite has been found in the area.Through field investigation and laboratory analysis,the beryllium mineralization mainly occurs in the alteration zone of alkali feldspar granites which is closely related to Fe-Mn mineralization and Pb-Zn mineralization,meanwhile associated Rb,Nb,Pb and Zn mineralization also occurs in the altered rock.The beryllium minerals are mainly helvite and phenacite,with a small amount of bertrandite.In addition,the study area is located in Guyuan-Hongshanzi uranium forming area and many uranium mineralization belts have been found,so it is speculated that the metallogenic type of this area is volcanic Be-U deposit.The Kulongshan area has similar rock type,formation age,tectonic setting and beryllium mineralization characteristics with the volcanic intrusive beryllium metallogenic belt in the southeast coast,and as a result,it has very good prospecting potential of Be,U,Nb,Pb,Zn and other polymetallic deposits.Therefore,the geological prospecting and exploration work and metallogenic mechanism research should be strengthened.

关 键 词：窟窿山 蚀变岩 火山岩型铍矿 日光榴石 找矿潜力 

分 类 号：P588.121[天文地球—岩石学] P618.72[天文地球—地质学]