| 河北三家金矿区构造研究及找矿方向 |
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| 引用本文：.1993.Structural studies of the Sanjia gold deposit,Hebei province,and ore-prospecting directions[J].Mineral Deposits,12(2):156~167 |
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| 中文摘要:文章论述了青龙县三家金矿区构造特征、矿床特征、矿床与断裂构造的成因联系·在多种手段综合研究的基础上，指出了矿区导矿构造和容矿构造，提出了本区中生代的三期主要构造应力场，强调了矿区内局部应力场与相应方向的优势节理相配合是本区金矿床形成的主要模式，在综合分析各项研究成果的基础上提出了本区控矿因素及找矿方向。 |
| 中文关键词:三家金矿区 构造应力场 岩石组构 控矿因素 找矿方向 |
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| Structural studies of the Sanjia gold deposit,Hebei province,and ore-prospecting directions |
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| Abstract:The Sanjia gold deposit in Qinglong county, Hebei Province has an area Of some 55 km2. The exposed strata are mainly Archean gneisses with small quantities of Lower Paleozoic strata in the east. In the ore district, NE-trending faults are dominant, dikes are well developed with the distribution of small-sized acid intrusive, and shear joints are ubiquitous. In the whole area, 81 measuring points have been arranged covering some 5500 joints. From the rose diagram, pole diagram and isopycnic diagram, the conclusion may be drawn that the ore veins and dikes in various parts of the whole area strike parallel to the major joints in wall rocks, and the major faults also strike in the same directions as the major joints across the rocks. It is known that the ore veins, dikes and faults in the ore district are developed on the basis of several sets of principal joints in the whole area. According to statistics in combination with field observations, the joints have been assigned to various phases and groups, the attitude of triaxia1 stress at each measuring point has been calculated, and the opinion about three phases of tectonic stress field as well as their sequence has been advanced. Based on characteristics of each phase of tectonic stress field, the formation styles and order of ore veins, dikes and faults in the area have been explained reasonably. The principal fault-F7 is controlled by six transverse profiles. From lateral structure, stress field analysis and petrofabric analysis, it is suggested that F2 was characterized by thrusting at the early stage and by left-lateral translation at the late stage. This implies that F7 serves as the passage way for ore fluids and the host structure. In the microscopic aspect, magnetic fabric analysis and petrofabric analysis were performed. The minimum magnetic susceptibility obtained from the former analysis is basically consistent with the direction of the principal compressive stress at the corresponding place. The tectonic mechanical property reflected by the petrofabric diagram based On the latter analysis is also generally in agreement with the conclusion got from field observations. In the macroscopic aspect, aeromagnetic data were processed, and a conclusion was reached that there exist some differences between the basements on the two sides of F7. It is found from the processed aeromagnetic map that NE-trending concealed intrusive are probably present. Finally, the ore-controlling factors of this area are summarized, the problem of structural ore-control is discussed in detail and, on such a basis, some ore-prospecting directions are given. |
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