河南卢氏南阳山花岗伟晶岩型稀有金属矿床地质—地球化学特征及找矿标志  

Geological and geochemical characteristics and prospecting sign of granite pegmatite-type rare metal deposits in Nanyangshan,Lushi County of Henan

作　　者：陶世旭 张彦锋 赵留升[1] 段兴民 孙佳楠 潘杰 裴满意 张璜[1] TAO Shixu;ZHANG Yanfeng;ZHAO Liusheng;DUAN Xingmin;SUN Jianan;PAN JIe;PEI Manyi;ZHANG Huang(The Fourth Geological Exploration Institute of Henan Provincial Bureau of Geology and Mineral Exploration and Development,Zhengzhou 450001,Henan,China;The Third Geological Brigade of Jiangxi Geological Bureau,Jiujiang 332000,Jiangxi,China)

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院,河南郑州450001 [2]江西省地质局第三地质大队,江西九江332000

出　　处：《矿产与地质》2023年第3期481-492,506,共13页Mineral Resources and Geology

基　　金：中国地质调查局“河南卢氏稀有多金属矿地质勘查与综合利用评价(编号:12120113061200)”与“豫西花岗伟晶岩田成岩成矿规律及成矿预测(豫地矿科研[2018]06号)”共同资助

摘　　要：南阳山一带稀有金属矿床是典型的花岗伟晶岩型稀有金属矿床。为查明花岗伟晶岩及矿体的地球化学特征,进一步总结区内稀有金属成矿特征,为该区域稀有金属找矿与研究提供经验,本次研究选取区内花岗伟晶岩及3个主要矿脉中代表性工程样品进行了主量成分、微量元素分析测试。结果表明:花岗伟晶岩具高SiO_(2)(70.62%~74.13%)、高Al_(2)O_(3)(13.09%~16.87%)、富碱Na_(2)O+K_(2)O(5.25%~7.97%)的特征,A/CNK比值为1.03~1.93,岩石属过铝质,具S型花岗岩的地球化学特征,总稀土含量(ΣREE)较低,轻稀土相对富集,重稀土相对亏损,分馏作用不明显。研究表明,稀有金属元素的富集程度与花岗伟晶岩的演化程度有良好的一致性,偏酸性的Ta、Nb与Na和强碱性元素Li、Rb、Cs与K具有明显的地球化学同步性,F、B等矿化剂对稀有元素的迁移、富集起着重要作用;各组矿脉元素变化特征与区域构造格架及伟晶岩脉沿裂隙侵入方向关系密切,不同空间位置交代作用的差异形成不同的矿石类型。通过总结研究区的地质-地球化学特征和找矿标志,为外围及同类型矿床的找矿提供了技术指导。The rare metal deposits in the Nanyangshan area are typical granite pegmatite type rare metal deposits.In order to identify the geochemical characteristics of granite pegmatite and ore bodies,further summarize the metallogenic characteristics of rare metals in the area,and provide the experience for rare metal prospecting and research in this area,in this study,the representative engineering samples of pegmatite and three main veins in the area are selected for the analysis of major composition and trace elements.The result shows that the granite pegmatite is characterized by high SiO 2(70.62%-74.13%),high Al_(2)O_(3)(13.09%-16.87%),and alkali-rich Na_(2)O+K_(2)O(5.25%-7.97%),the ratio of A/CNK is 1.03-1.93.The rock is peraluminous with the geochemical characteristics of S-type granite.The total content of rare earth elements(ΣREE)is low,the light rare earth elements are relatively enriched,the heavy rare earth elements are relatively depleted,and the fractionation effect is not obvious.The research result indicates that the enrichment degree of rare metal elements is in a good agreement with the degree of differentiation and evolution of granite pegmatite.The acidic elements of Ta,Nb and Na and the strong alkaline elements of Li,Rb,Cs and K have obvious geochemical synchronization.F,B and other mineralizers play an important role in the migration and enrichment of rare elements.The variation characteristics of each element group of ore veins are closely related to the regional tectonic framework and the intrusive direction of pegmatite veins along the fractures.Differences in the anomasomatic function of different spatial positions form different ore types.For the summary of the geological-geochemical characteristics and prospecting sign of the study area,it provides the technical guidance for the prospecting of similar deposits in the peripheral area.

关 键 词：花岗伟晶岩 稀有金属 地质地球化学特征 找矿标志 南阳山 河南卢氏 

分 类 号：P618.7[天文地球—矿床学]