黔北铝土矿床K、Na含量比的沉积环境指示意义  

Implication of Na/K ratio to the sedimentary environment of bauxite deposits in Northern Guizhou

作　　者：向贤礼[1] 金中国 韩润生[3] 黄智龙[4] 谷静[4] 

机构地区：[1]贵州理工学院,贵阳550003 [2]贵州省有色金属和核工业地质勘查局,贵阳550005 [3]昆明理工大学,昆明650051 [4]中国科学院地球化学研究所,贵阳550002

出　　处：《矿产与地质》2014年第6期685-691,共7页Mineral Resources and Geology

基　　金：科技部科技支撑项目"贵州省务正道地区铝土矿勘查技术集成与示范研究"(项目编号:2011BAB04B04)资助

摘　　要：岩石矿物的某些地球化学成分可指示特定的成岩成矿环境。在对黔北(道真、务川、正安)铝土矿床的研究中,发现铝土矿石中K2O含量普遍小于Na2O含量。其它沉积环境地球化学标志显示矿床沉积于陆相淡水环境。通过国内铝土矿床的对比研究,认为海相环境形成的铝土矿床K2O/Na2O比值大于1,陆相淡水环境形成的铝土矿床K2O/Na2O比值小于1,反映了K、Na含量比对铝土矿床的沉积环境具有明显的指示意义。Some of the chemical components of rocks and minerals may indicate certain diagenetic and metallo-genic environment.The study on bauxite deposits in North Guizhou (Daozhen,Wuchuan and Zheng’an) finds that the K2 O content in bauxitic ores is commonly lower than Na2 O content.Other geochemical indica-tors of sedimentary environment show that the deposits precipitate in continental freshwater environment. After comparing the results with other studies of domestic bauxite deposits,the author believes that K2 O/Na2 O ratio of bauxite deposits formed in marine environment is more than 1,whereas K2 O/Na2 O ratio of bauxite deposits formed in continental freshwater environment is less than 1.It is revealed that Na/K ratio is an obvious indicator to the sedimentary environment of bauxite deposits.

关 键 词：铝土矿 沉积环境 成矿环境 地球化学 

分 类 号：P618.45[天文地球—矿床学]