投稿时间：2020-05-29
修订日期：2020-12-22
网络发布日期：2021-03-06
中文摘要:张麻井铀钼矿床是中国北方地区最大的火山岩型铀钼矿床。为探讨该矿床的铀钼成因关系，对浸染状钼（铀）矿石开展了矿物学和元素地球化学研究。除沥青铀矿外，铀石也是该矿床的一种重要铀矿物，常呈他形粒状，与胶硫钼矿、闪锌矿共生。元素面扫描结果显示，铀与钼元素的空间分布范围非常一致，表明铀和钼可能为同一期成矿作用的产物。此外，相较于矿化的核部，边部的铀含量降低，钼含量升高，反映存在一期独立的富钼流体成矿作用。结合矿床地质特征和岩石地球化学特征，认为张麻井矿床中浸染状矿体具有斑岩型矿化的特点，暗示其早期钼（铀）矿化可能为斑岩型矿化。
Abstract:The Zhangmajing U-Mo deposit is the largest volcanic type uranium deposit in North China. In order to constrain the genetic relationship between uranium and molybdenum in the orebody, the authors carried out minera-logical and geochemical study of disseminated Mo-(U) ore. In addition to pitchblende, coffinite is also an important uranium mineral in the deposit, which usually coexists with jordisite and sphalerite as anhedral grains. Element scanning of thin sections shows that the spatial distribution of uranium and molybdenum is well consistent, indicating that uranium and molybdenum enrichment was probably formed in the same mineralization. In addition, compared with the core of the mineralization, the uranium content in the rim is relatively lower while the molybdenum content is relatively higher, which indicates the existence of an independent molybdenum-rich fluid mineralization. Combined with other geological and geochemical characteristics, the authors hold that the disse-minated orebody in the Zhangmajing deposit has the features of porphyry mineralization, which may indicate a porphyry genesis for the early Mo-(U) mineralization.
keywords:geochemistry volcanic uranium-molybdenum deposit genetic relationship porphyry minera-lization Zhangmajing deposit
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基金项目:本文得到国防科工局核能开发项目（编号：HD037-3）、国家自然科学基金委面上项目（编号：41772082）和中国核工业地质局铀矿地质项目（编号：201931）联合资助
引用文本：
朱斌,黄志新,钟军,东前,焦永玲.2021.河北张麻井矿床的矿物学研究及其对铀钼成因关系的启示[J].矿床地质,40(1):53~64ZHU Bin,HUANG ZhiXin,ZHONG Jun,DONG Qian,JIAO YongLing.2021.Mineralogical study of Zhangmajing deposit, Hebei Province: Implications for genetic relationship between U and Mo[J].Mineral Deposits40(1):53~64
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