江苏溧水爱景山锶矿床是我国火山热液型锶矿床的典型代表,也是溧水盆地内目前唯一在采的锶矿床。矿山露天转井下后,目前已形成地下7个采矿中段。在实际开拓工程及采矿过程中发现,矿体的形态及延展有时与勘查资料并不一致,制约了探矿工...江苏溧水爱景山锶矿床是我国火山热液型锶矿床的典型代表,也是溧水盆地内目前唯一在采的锶矿床。矿山露天转井下后,目前已形成地下7个采矿中段。在实际开拓工程及采矿过程中发现,矿体的形态及延展有时与勘查资料并不一致,制约了探矿工程的布置和采矿进展。本文以溧水爱景山锶矿床−230 m中段为例,较详细地调查了该中段隐伏断裂构造的分布,分析了构造的特征、属性及形成的先后关系,以及构造对矿体形态的控制。矿区早期NW向F2和F7断裂构造既是导矿构造,又是控矿构造;F2断裂控制了矿体的下盘边界,F7断裂控制了矿体的上盘边界。受区域构造活动的影响,区域NW向断裂构造派生形成的近EW向逆冲断裂、压性或平移断裂,是矿体膨大缩小、分支复合、尖灭再现的主要构造,是破矿构造,而派生出的NE向张性断裂构造规模较小,对矿体破坏甚微。提出了开拓工程部署建议,可为其他中段探矿工程布置提供借鉴。The Aijingshan strontium deposit in Lishui, Jiangsu Province is a typical representative of volcanic hydrothermal strontium deposits in China and is also the only strontium deposit currently being mined in Lishui volcanic basin. After the transition from open mining to underground mining, seven mining sections have been formed. In actual exploration and mining processes, it has been found that the morphological characteristics and extension of ore bodies are sometimes inconsistent with exploration data, which restricts the layout of exploration engineering and mining progress. This paper takes the −230 m middle section of the Aijingshan strontium deposit in Lishui as a study case. The distribution of hidden fault structures in the section is investigated in detail, and their characteristics, attributes, and the sequence of formation of the structure, as well as the tectonic control of the ore body morphology, are analyzed. The early NW-oriented F2 and F7 fault structures in the mining area are not only ore-guiding structures, but also ore-controlling structures. The F2 fault controls the footwall boundary and the F7 fault controls the hanging wall boundary of the ore body. Affected by the regional tectonic activity, the near EW trending thrust faults, compressive or translational faults that derived from the regional NW trending fault structures are the main structures as well as ore-breaking structures for the swelling and shrinking, branching and recombination, and pinching out and reappearing of the ore bodies, while the NE extensional fault structures derived from the regional NW trending fault structures are smaller in scale and cause minimal damage to the ore bodies. The suggestions for the deployment of exploration projects are proposed, which can provide a reference for other middle sections of exploration projects.展开更多
文摘江苏溧水爱景山锶矿床是我国火山热液型锶矿床的典型代表,也是溧水盆地内目前唯一在采的锶矿床。矿山露天转井下后,目前已形成地下7个采矿中段。在实际开拓工程及采矿过程中发现,矿体的形态及延展有时与勘查资料并不一致,制约了探矿工程的布置和采矿进展。本文以溧水爱景山锶矿床−230 m中段为例,较详细地调查了该中段隐伏断裂构造的分布,分析了构造的特征、属性及形成的先后关系,以及构造对矿体形态的控制。矿区早期NW向F2和F7断裂构造既是导矿构造,又是控矿构造;F2断裂控制了矿体的下盘边界,F7断裂控制了矿体的上盘边界。受区域构造活动的影响,区域NW向断裂构造派生形成的近EW向逆冲断裂、压性或平移断裂,是矿体膨大缩小、分支复合、尖灭再现的主要构造,是破矿构造,而派生出的NE向张性断裂构造规模较小,对矿体破坏甚微。提出了开拓工程部署建议,可为其他中段探矿工程布置提供借鉴。The Aijingshan strontium deposit in Lishui, Jiangsu Province is a typical representative of volcanic hydrothermal strontium deposits in China and is also the only strontium deposit currently being mined in Lishui volcanic basin. After the transition from open mining to underground mining, seven mining sections have been formed. In actual exploration and mining processes, it has been found that the morphological characteristics and extension of ore bodies are sometimes inconsistent with exploration data, which restricts the layout of exploration engineering and mining progress. This paper takes the −230 m middle section of the Aijingshan strontium deposit in Lishui as a study case. The distribution of hidden fault structures in the section is investigated in detail, and their characteristics, attributes, and the sequence of formation of the structure, as well as the tectonic control of the ore body morphology, are analyzed. The early NW-oriented F2 and F7 fault structures in the mining area are not only ore-guiding structures, but also ore-controlling structures. The F2 fault controls the footwall boundary and the F7 fault controls the hanging wall boundary of the ore body. Affected by the regional tectonic activity, the near EW trending thrust faults, compressive or translational faults that derived from the regional NW trending fault structures are the main structures as well as ore-breaking structures for the swelling and shrinking, branching and recombination, and pinching out and reappearing of the ore bodies, while the NE extensional fault structures derived from the regional NW trending fault structures are smaller in scale and cause minimal damage to the ore bodies. The suggestions for the deployment of exploration projects are proposed, which can provide a reference for other middle sections of exploration projects.
