河北相广锰银矿床成矿特征与形成机理

河北相广锰银矿床成矿特征与形成机理

刘成维谷振飞魏明辉陈树清杨云李玉红

（河北省地矿局第三地质大队，河北张家口075000）

摘要：位于河北省张家口市涿鹿县的相广锰银矿床，是一个较早发现的中型低硫化物型浅成低温热液矿床。矿床赋存于侏罗纪后城组和张家口组，与侏罗纪晚期古火山构造关系密切。锰银矿体主要受断裂构造的控制，矿石中矿物组成相当丰富。稀土元素配分形式以及铅同位素组成表明，成矿金属物质主要来自赋矿围岩和下伏地层，同时还有深部物质参与。围岩蚀变特征及蚀变带空间分布特征均显示矿床深部存在高中温热液多金属矿床。

关键词：锰银矿床；花岗斑岩；成矿特征；形成机理；河北相广

Metallogenic characteristics and formation mechanism of the Xiangguang Mn-Ag ore

deposit, Hebei Province

LIU ChengWei, GU ZhenFei, WEI MingHui, CHEN ShuQing, YANG Yun, LI

YuHong

（The 3ed Brigade of Geology HBBGMR, Zhangjiakou Hebei 075000, China）Abstract: Located in the Zhuolu county, Zhangjiakou, Hebei Province, North China, the Xiangguang Mn-Ag ore deposit is a middle-scale low-sulfidation epithermal type which was been discovered long time ago. The ore deposit occurs in the Jurassic-age Houcheng and Zhangjiakou Fms., which is closely related to the paleo-volcanic structural. The Mn-Ag ore mineralization is mainly controlled by a series of shear zones and ore minerals are quite complex. In the light

of the REE distribution patterns and Pb isotopic compositions show that the ore-forming materials were derived mainly from country rocks and underlying rocks and partly from deeper sources. The alteration pattern and location of alteration assemblages, which implies that potential exists high or medium-temperature hypothermal deposit at depth.

Key word: Mn-Ag ore deposit, metallogenic characteristics, formation mechanism, Xiangguang Hebei

河北省涿鹿县相广锰银矿床开采历史悠久，在宋朝初年该区就有炼银的相关记载。20世纪80～90年代，对其开展了普查工作，探明金属资源量达中型规模；2007～2008年开展了详查工作，迄今矿床边界尚未控制，通过进一步工作有望使金属资源量达大型。因此，深入研究该矿床的成矿地质特征，探讨其形成机理，

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建立成矿模型，对今后寻找和评价此类矿床具有重要地质意义。

1 成矿地质背景

相广锰银矿床位于华北板块北部，燕山褶皱带西北端（图1）。该区经历了多期复杂的大地构造演化阶段，从元古代吕梁运动到新生代喜马拉雅运动，对其都有影响。