| 河北省赤城县万全寺银金矿形成时代及其地质意义 |
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| 引用本文：刘庆民,韩玉丑,李随民.2018.河北省赤城县万全寺银金矿形成时代及其地质意义[J].地球学报,39(4):474-480. |
| DOI：10.3975/cagsb.2018.061902 |
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| 基金项目:河北省国土资源厅基金项目(编号: 2012055548; 2013045650) |
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| 中文摘要:张家口赤城县万全寺银金矿床为冀北地区在成矿作用上与火山期后热液活动有关的代表性矿床。银金矿物主要以包裹体形式嵌布于闪锌矿、方铅矿、黄铁矿、黄铜矿等硫化物中, 硫化物是银、金的主要载体, 硫化物的形成时间可代表银金矿床的成矿时间。本研究采用Rb-Sr法对闪锌矿、黄铁矿、方铅矿这三种共生硫化物矿物进行了测定, 获得Rb-Sr等时线年龄为(144.1±4.0) Ma (MSWD=3.3, n=6), 认为该年龄代表万全寺银金矿的成矿年龄。该年龄与区内已知的其他多金属矿床成矿时代接近, 也与区内北东向上黄旗—乌龙沟构造-岩浆岩带的主要活动时期相吻合, 表明在晚侏罗世—早白垩世期间, 张家口地区存在一次强烈的与中酸性岩浆活动相关的贵金属与多金属的成矿作用。 |
| 中文关键词:成矿年龄 Rb-Sr等时线 硫化物 银金矿床 万全寺 河北 |
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| Metallogenic Epoch of the Wanquansi Silver-gold Deposit in Zhangjiakou, Hebei Province, and Its Geological Significance |
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| Abstract:The Wanquansi silver-gold deposit is a typical ore deposit related to volcanic hydrothermal activity in northern Hebei Province. Silver minerals and gold minerals are mainly embedded in sphalerite, galena, pyrite, chalcopyrite and other sulfides in the form of inclusions. Sulfide is the main gold-bearing mineral in the Wanquansi ore deposit, the formation time of sulfide can represent the metallogenic time of silver and gold. The metallogenic time of the Wanquansi silver-gold deposit is (144±4) Ma obtained by the method of Rb-Sr isotopic dating. Dating samples were collected from sphalerite, galena and pyrite. The metallogenic epoch of the Wanquansi silver-gold deposit was close to that of the other ore deposits located in the northeastern place of the Shanghuangqi–Wulonggou tectonic-magmatite belt, and this stage was also the main activity period of the tectonic-magmatite belt. Isotope ages indicate that there existed a large scale mineralization of metals and precious metals related to the intermediate-acid magma activity during the Late Jurassic–Early Cretaceous period. |
| keywords:ore-forming age Rb-Sr isochron sulfide silver-gold deposit Wanquansi Hebei |
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