豫西嵩县石门铷矿床中隐爆角砾岩的发现及其意义  

Discussion on the characteristics of cryptoexplosive breccia and its genesis in Shimen rubidium deposit,Songxian,western Henan Province

作　　者：王世权 李山坡 彭江涛 苏永锋 鲁培庆 WANG Shiquan;LI Shanpo;PENG Jiangtao;SU Yongfeng;LU peiqing(Henan Academy of Geology,Zhengzhou,450001 Henan,China;Henan Key Laboratory for Metal Mineral Ore-forming Geological Process and Utilization of Resource,Zhengzhou,450001 Henan,China;Henan Academician Workstation of Deep Zone Mineralizing Control and Metallogenic Mechanism for Metal Mineral,450001 Henan,China)

机构地区：[1]河南省地质研究院,河南郑州450001 [2]河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450001 [3]河南省金属矿产深部控矿与成矿机制院士工作站,河南郑州450001

出　　处：《矿产勘查》2023年第10期1949-1958,共10页Mineral Exploration

基　　金：河南省自然资源科研基金项目“华北陆块南缘碱性岩型稀有稀土金属富集机理与找矿方向研究(豫财招标采购2020-165-3)”;豫西陕州—渑池地区深部铝土矿地下开采地质环境特征研究(2023-331-XM023-KT04)联合资助。

摘　　要：石门铷矿床位于华北陆块南缘之外方山断隆,矿体赋存于印支期乌桑沟正长岩体内,正长岩主要成分为钠长石、微斜长石,具次生加大现象。通过对矿区新发现的隐爆角砾岩中正长岩进行主量、微量以及稀土元素分析,正长岩具高硅(SiO_(2)=60%~70%)、贫铁(F_(2)O_(3)+FeO=1.89%~5.63%)、高钾(K_(2)O=10.19%~15.80%)、低钙(CaO=0.09%~1.25%)、低钠(Na_(2)O=0.06%~0.38%)等特点,研究认为以上地幔物质为主的过碱性流体上侵过程中交代、重熔周围岩石形成的碱交代热液,热液上升至浅地表发生爆炸形成隐爆角砾岩,热液中Rb元素形成的络合物发生分解置换长石和云母中的K,最终累积富集成矿。该矿床为一碱交代热液型铷矿床,外方山地区及外围存在很多类似的碱性岩体,建议加强对此类型矿床的研究与寻找工作。The Shimen rubidium(Rb)deposit is located in the Waifangshan fault-uplift area in the southern margin of the North China Block.The ore body occurred in the Indosinian Wusanggou syenite.The syenite is mainly composed of albite and microcline with secondary overgrowth phenomenon.Comprehensive studies of the major,minor and rare earth elements of syenitic rocks in the cryptoexplosive breccia newly found in the mining area,syenite is characterics with high silica(SiO_(2)=60%-70%),low iron(F_(2)O_(3)+FeO=1.89%-5.63%),high potassium(K_(2)O=10.19%-15.80%),low calcium(CaO=0.09%-1.25%)and low sodium(Na_(2)O=0.06%-0.38%);it is believed that the peralkaline fluid mainly originated from the upper mantle materials formed the alkaline metasomatic hydrothermal fluid,and remelted the surrounding rocks during the emplacement.Then the hydrothermal fluid rose to the shallow surface and exploded to form the cryptoexplosive breccia.The Rb-bearing complex in the hydrothermal solution decomposed and replaced potassium in feldspar and mica,forming the Rb mineralization.Therefore,this deposit should belong to alkali-metasomatic hydrothermal Rb deposit.There are many similar alkaline stocks in the Waifangshan area and its periphery are,and it is meaning to look for similar Rb mineralization within these stocks.

关 键 词：乌桑沟岩体 正长岩 隐爆角砾岩 碱交代热液 石门 铷矿床 

分 类 号：P611[天文地球—矿床学]