| 李久明,巩恩普,姚玉增,梁俊红.冀北丰宁银(金)矿床地质、地球化学特征及成因[J].地质找矿论丛,2006,(4):241-247 |
| 冀北丰宁银(金)矿床地质、地球化学特征及成因 |
| THE GEOLOGICAL-GEOCHEMICAL CHARACTERISTICS AND METALLOGENY OF FENGNING SILVER-POLYMETALLIC ORE DEPOSIT,NORTH HEBEI PROVINCE |
| 投稿时间：2005-11-14 修订日期：2006-02-20 |
| DOI：10.6053/j.issn.1001-1412.2006.4. 004 |
| 中文关键词: 冀北 丰宁银-多金属矿床 地质、地球化学特征 浅成低温热液 |
| 英文关键词:north Hebei province Fengning silver-polymetallic ore deposit geological-geochemical characteristics epithermal fluid |
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| 中文摘要: |
| 冀北丰宁银(金)矿床的成矿深度<1 km,成矿温度<300℃,成矿时间晚于次火山隐爆成岩作用1.0 Ma以上,是与隐爆作用有关的陆相次火山浅成低温热液型银多金属矿床。次火山隐爆作用只是一种构造动力因素,起到动力源和提供扩容空间的间接成矿作用,而直接的成矿环境为浅成低温水热流体的成矿演化体系。热液流体大致可分为两类:一是富含SiO2的热流体,存在于每次隐爆作用之中,起到胶结花岗质角砾的作用,并有少量金属硫化物(如黄铁矿等)沉淀;二是有大量地下水参与的含矿水热流体,形成于隐爆作用发生之后,此阶段的热液活动导致Au,Ag,Pb,Zn,Fe,Cu等金属及其化合物的富集与沉淀。 |
| 英文摘要: |
| The analysis on geological-geochemical characteristics of Fengning silver-polymetallic ore deposit indicates that the metallogenic depth is less than 1km,the metallogenic temperature is less than 300℃ and the metallogenic epoch is estimated about 1.0Ma later than cryptoexplosion of sub-volcano,thus the deposit belongs to terrestrial sub-volcanic epithermal silver-polymetallic deposit related to cryptoexplosion.The sub-volcanic cryptoexplosion,as a tectonic dynamic factor,merely acts as the dynamic source and provision of expansion space,while the direct metallogenic environment is epithermal fluid evolution system.The fluid can be divided into two types: one is SiO2-rich fluid,which occurred in every cryptoexplosion and cement the granitoid breccia and there is little metal sulfides precipitated;the other is ore-bearing hydrothermal fluid with lots of groundwater,which occurred later than cryptoexplosion,and the hydrothermal activity leads to the metal elements,such as Au,Ag,Pb,Zn,Cu and their composites enriched and precipitated. |
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