甘肃省龙首山成矿带中段钠长岩脉地质特征及其与铀矿化关系研究.docx

甘肃省龙首山成矿带中段钠长岩脉地质特征及其与铀矿化关系研究
甘肃省龙首山成矿带中段钠长岩脉地质特征及其与铀矿化关系研究
摘要：
钠长岩脉广泛分布于甘肃省龙首山成矿带中段地区，其特征为具有高钠、铝质，富含Nd、Sr等元素。研究表明，钠长岩脉与该区域铀矿化有密切关系，因此深入挖掘其地质特征及其与铀矿化的关系，对该区域的矿床找矿及开发具有重要意义。
本文将分别从地质特征、矿物组成、地球化学特征、锆石U-Pb年代学以及岩石地球物理学等方面对该区域钠长岩脉进行了综合研究，并尝试探讨其与铀矿化的关系。结果表明，该区域钠长岩脉年代为侏罗纪晚期-白垩纪早期，其地球化学特征具有亲铀性和亲铀元素克隆特征，表明其与铀矿化的关系密切。此外，钠长岩脉上附着的铀矿物多属于杂正长石和斜长石团簇中的针状晶体，其平均含量也较高。综合分析表明，甘肃省龙首山成矿带中段钠长岩脉与该区域的铀矿化密切相关，其探查和评价具有重要的实践意义。
关键词：钠长岩脉；地质特征；矿物组成；地球化学特征；岩石地球物理学；铀矿化
Abstract：
TheNa-richgraniteveinsarewidelydistributedinthemiddlesectionoftheLongshouMountainmetallogenicbeltinGansuProvince,characterizedbyhighNaandAlcontent,andenrichedelementssuchasNdandSr.ResearchshowsthatNa-richgraniteveinsarecloselyrelatedtouraniummineralizationintheregion,soexploringtheirgeologicalcharacteristicsandtherelationshipwithuraniummineralizationisofgreatsignificanceformineralexplorationandexploitationintheregion.
Inthispaper,weconductedacomprehensivestudyontheNa-richgraniteveinsintheregionfromgeologicalcharacteristics,mineralcomposition,geochemicalcharacteristics,zirconU-Pbgeochronology,androckgeophysics,andtriedtoexploretheirrelationshipwithuraniummineralization.TheresultsshowthattheNa-richgraniteveinsintheregionaredatingfromtheLateJurassictoEarlyCretaceous,withgeochemicalcharacteristicsofurano-philicityanduranium-elementcloningcharacteristics,indicatingclosenesstouraniummineralization.Inaddition,theuraniummineralsattachedtoNa-richgraniteveinsaremostlyneedle-likecrystalsinmixedplagioclaseandclinopyroxeneclusters,withanaveragecontentalsohigher.ComprehensiveanalysisshowsthatNa-richgraniteveinsinthemiddlesectionofLongshouMountainmetallogenicbeltinGansuProvincearecloselyrelatedtouraniummineralizationintheregion,andtheirexplorationandevaluationhaveimportantpracticalsignificance.
Keywords:Na-richgraniteveins;geologicalcharacteristics;mineralcomposition;geochemicalcharacteristics;rockgeophysics;uraniummineralization.