| 冀北两种类型钼矿床地质特征与控矿因素差异性分析 |
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| 引用本文：李随民,焦雪红,韩玉丑,唐天送,李紫烨,邢欢,李宾,孙志伟,李玉成,赵志斌,专少鹏,王京涛,王俊革,杨云,胡志强,孙金龙,赵建亮,李继超.2023.冀北两种类型钼矿床地质特征与控矿因素差异性分析[J].地球学报,44(6):967-982. |
| DOI：10.3975/cagsb.2023.080301 |
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| 基金项目:河北省自然资源厅基金项目(编号: 13000022P00F2D410169J);河北地质大学区域地质与成矿作用重点实验室开放基金(编号: 2020041) |
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| 中文摘要:冀北(张家口—承德)目前已发现的钼矿床可分为两种类型, 一是主要分布于冀北南部燕山裂陷带中, 钼矿化发生时间与矿区酸性岩体侵位时间接近或相当, 金属矿物以辉钼矿为主, 围岩蚀变主要为钾化、硅化, 成矿流体以高温、高盐度为特征; 另一类主要分布于华北地台北缘隆起带内中生代火山断陷盆地中, 金属矿物以低温胶硫钼矿物为主, 多与铀矿共生, 围岩蚀变以水云母化、萤石化、胶黄铁矿化为主, 成矿流体显示低温、低盐度特征。以胶硫钼为主的铀钼矿床由于缺少合适的钼矿化定年矿物, 目前年龄测试数据多限于铀矿化, 测试结果表明铀矿化与区内酸性岩体及赋矿地层之间存在显著的岩矿时差。在冀北及邻区已有地质资料基础上, 本文对冀北上述两种类型钼矿床存在的地质问题及研究现状进行了评述, 指出分布于中生代火山断陷盆地中钼矿化成矿时代厘定问题是分析该类型铀钼矿床成矿作用过程、确定成因类型、评价深部找矿潜力的关键。 |
| 中文关键词:钼矿床 成因类型 成矿时代 张家口组火山岩 冀北 |
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| Difference Analysis of the Geological Characteristics and Ore-controlling Factors of Two Types of Molybdenum Deposits in Northern Hebei Province |
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| Abstract:The molybdenum deposits in northern Hebei (Zhangjiakou–Chengde) can be divided into two types. One is mainly distributed in the Yanshan rifting zone in the southern part of the North China Platform. The occurrence time of molybdenum mineralization in this type is similar to the emplacement time of the acid rock mass in the mining area. The metal minerals are mainly molybdenite, surrounding rock alteration is majorly potassic and silicified, and ore-forming fluid is characterized by a high temperature and salinity. The other type is mainly distributed in the Mesozoic volcanic fault basins in the northern margin uplift belt of the North China Platform. The metal minerals of this type are jordisite and melnikovite, which are primarily low-temperature minerals, and they are mostly associated with uranium ore. The surrounding rock alteration is primarily hydromica, fluorite, and melnikovite, and the ore-forming fluids show low temperature and low salinity characteristics. Owing to the lack of suitable molybdenum mineralization dating minerals, the present age test data are mostly limited to uranium mineralization. The test results show that significant differences exist in the rock between uranium mineralization. On the basis of the existing geological data in northern Hebei and its adjacent areas, we reviewed the prevailing geological problems and research status of the aforementioned molybdenum deposits. We emphasized that the ore formation age of the molybdenum deposits is a key problem, which is associated with the mineralization process, genetic type, and deep prospecting potential. |
| keywords:molybdenum deposit genetic type metallogenic age volcanic rocks of Zhangjiakou Formation northern Hebei |
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