冀北火山岩型铀矿地球化学评价指标研究
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引用本文:师淑娟,王学求,李冉,丁赛.2019.冀北火山岩型铀矿地球化学评价指标研究[J].地球学报,(3):469-477.
DOI:10.3975/cagsb.2018.110202
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作者单位E-mail
师淑娟 河北省地球物理勘查院 shishujuan1113@sina.com 
王学求 自然资源部地球化学探测技术重点实验室, 中国地质科学院地球物理地球化学勘查研究所  
李冉 河北省地球物理勘查院  
丁赛 河北省地球物理勘查院  
基金项目:河北省地质矿产局科研项目(编号: 冀地地审[2015]30号);国家重点研发计划“穿透性地球化学勘查技术”(编号: 2016YFC0600600)
中文摘要:冀北地区是火山岩型铀矿的有利产出区域, 本文以该区的水系沉积物区域化探数据与典型铀矿矿区岩石和土壤地球化学数据为研究基础, 建立适用于火山岩型铀矿的地球化学勘查评价指标。含矿围岩富铀、钍、硅、钾。铀富集于粗粒级(?4 ~ +20目)水系沉积物和细粒级(?100目)土壤。因此, 粗粒级水系沉积物是区域测量的有效采样介质, 细粒级土壤是矿区测量的有效采样介质。火山岩型铀矿直接的特征指示元素为U和Mo, 其它伴生元素还有Th、La、Hg、Sb、Zr、B、F等。该指标的建立对冀北地区及北方火山岩型铀矿勘查评价具有实际意义。
中文关键词:火山岩型铀矿  地球化学评价指标  冀北地区
 
Geochemical Indicators for Volcanic-type Uranium Deposits in Northern Hebei Province
Abstract:North Hebei is a favorable area in search for volcanic-rock type uranium ore deposits. This study combined the regional geochemical data and local data of 460 and 534 uranium ore deposits so as to establish regional geochemical evaluation indicators of the volcanic type uranium deposits and provide guidance for the evaluation of uranium deposits in this area. Uranium deposits are hosted in volcanic rocks with high background of U (8.9×10–6~13.5×10–6), Th (37×10–6~48×10–6), SiO2 (75%~80%) and K2O (5%~6%) and with low background of Fe2O3, MgO, Na2O and Sr. Uranium is concentrated in coarse grain fraction (–4~+20 mesh) of stream sediments and in fine grain fraction of soils (–100 mesh), which indicates that coarse-grained stream sediments and fine-grained soils are useful sample media for regional and local geochemical survey respectively. U and Mo are direct indicator elements for volcanic type uranium deposits. The other associated elements include Th, La, Hg, Sb, Zr, etc. The indicators are helpful for the evaluation of volcanic type uranium deposits not only in north Hebei but also in the whole North China.
keywords:volcanic type uranium deposit  geochemical indicator  northern Hebei
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