| 万 会.承德地区烟筒山-磴西锌多金属矿床地质特征及找矿方向[J].地质与勘探,2021,57(5):959-968 |
| 承德地区烟筒山-磴西锌多金属矿床地质特征及找矿方向 |
| Geological characteristics and prospecting direction of the Yantongshan-Dengxi zinc polymetallic mine district in the Chengde area, Hebei Province |
| 投稿时间：2020-07-06 修订日期：2021-07-29 |
| DOI：10.12134/j.dzykt.2021.05.002 |
| 中文关键词: 矿床地质特征 矿床成因 控矿构造 找矿方向 烟筒山-磴西锌多金属矿床 承德 河北 |
| 英文关键词: geological characteristics of deposit, genesis of deposit, ore controlling structure, prospecting direction,Yantongshan-Dengxi zinc polymetallic mine district,Chengde,Hebei Province |
| 基金项目:国家专项“《矿产资源综合勘查评价规范》国家标准修订研究”（编号：CB2019-2）资助 |
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| 中文摘要: |
| 河北承德地区丰宁-隆化断裂带周边已发现了多个金属矿床。近年来，通过矿产地质勘查在烟筒山-磴西矿区发现了18个锌矿体、5个金矿体、2个银矿体。为明确该区找矿方向，提高找矿效果，文章通过分析烟筒山-磴西锌多金属矿床的区域地质特征、控矿地质因素、矿床特征、矿床成因及期次等，总结了矿床分布规律，提出了对矿床成因与找矿方向的认识。研究认为这些金属矿床与构造运动尤其是断裂带发育密切相关，岩浆活动是成矿作用的动力源，区内热液、蚀变与矿化是同一过程。自太古代到中生代，经过早白垩世的逆冲推覆、中白垩世的伸展变形等多期次的地质作用，形成了性质、规模不等的近EW向、NE向、NW向3组断裂构造，为Zn、Pb等提供了良好的成矿条件。中生界白垩系下统滦平群大北沟组（K1d）出露于丰宁-隆化断裂带及以南，岩性为中酸性及偏碱性陆相火山碎屑岩-角砾岩、凝灰岩等，其地层间的薄弱带是重要的成矿空间。区内主断裂F2属于温家沟-东山断裂带，是本区铅多金属矿的主要控矿构造，为主要找矿方向。元古界长城系高于庄组（Chg）是以富镁碳酸盐为主的滨海相沉积地层，主要有硅质白云岩、含碳泥质白云岩，是主要控矿围岩。白云岩中Ag的变异系数大于6.0，是银矿体的主要找矿方向。在今后找矿工作中，要重点发现构造标志，以断层作为主要的找矿方向。同时，要注意发现岩浆岩、蚀变带标志及地球化学异常，以更好地提高找矿效果。 |
| 英文摘要: |
| In recent years, many metal deposits have been discovered around the Fengning-Longhua fault zone in the Chengde area, Heibei Province, such as the Yantongshan-Dengxi mine district containing 18 zinc, 5 gold and 2 silver orebodies. The purpose of this work is to clarify further prospecting direction and improve the ore-search effect in this mine area. We analyze the regional geological characteristics, ore controlling geological factors, deposit features, genesis and development stages of this zinc polymetallic mine, summarize its distribution regularity, and put forward the understanding of the genesis and prospecting direction of the deposit. It is considered that these metal deposits are closely related to tectonic movement, especially the development of fault zones. Magmatic activity is the driving source of mineralization, and hydrothermal, alteration and mineralization are the same process in this area. From Archean to Mesozoic, three groups of nearly EW-, NE- and NW-trending faults with different properties and scales were formed by multiple stages of geological processes such as thrusting and napping in Early Cretaceous and extensional deformation in Middle Cretaceous, which provided favorable metallogenic conditions for Zn and Pb. The Dabeigou Formation (K1d) of lower Cretaceous Luanping Group in Mesozoic is exposed in the Fengning-Longhua fault zone and its south, with intermediate acid and alkaline continental pyroclastic rocks, breccia and tuff. The weak zone between strata is an important metallogenic space. The main fault F2 in the area belongs to the Wenjiagou-Dongshan fault zone, which is a main ore controlling structure of lead polymetallic deposits in this area, so can be regarded as a main prospecting direction. Gaoyuzhuang Formation (Chg) of the Proterozoic Changcheng System is a coastal facies sedimentary stratum mainly composed of magnesium-rich carbonate, composed of siliceous dolomite and carbonaceous argillaceous dolomite, which is a major ore-controlling wall rock. The difference coefficient of Ag in dolomite is 6.0, indicating a prospecting direction of silver orebodies. In the future prospecting work, our attention should focus on the discovery of structural markers, with faults as the main prospecting direction. At the same time, attention should also be paid to the discovery of magmatic rocks, alteration zone marks and geochemical anomalies, so as to improve the prospecting effect. |
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