Ore-Controlling Structures and Metallogenic Favorable Area Prediction in Baiyun-Xiaotongjiabuzi Ore Concentration Area, Eastern Liaoning Province
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摘要: 白云-小佟家堡子矿集区是辽东青城子矿集区的重要组成部分之一，包括位于北部的白云（二道沟、三道沟）、荒甸子等大中型金矿床及位于南部的林家三道沟、小佟家堡子、杨树、桃源等大型或中小型金矿床，高家堡子、凤银大地、姜家沟等大中型银矿床.前人对该区成岩成矿时代及金-多金属成矿作用开展了大量的研究工作，但控矿构造研究相对薄弱.研究结果表明，北部白云-荒甸子矿区容（含）矿构造为近东-西走向，向南倾，倾角30°左右逆冲断裂带，沿走向延伸近8 km.该逆冲断裂带由主逆冲断层及与其近于平行的若干条逆冲断层组成，宽度可达200 m.主断层面下部地层产状陡，上部缓，明显切层；而上部逆冲断层则以顺层为主.断层面一般呈舒缓波状，缓倾部位为矿体富集区域.南部林家三道沟-小佟家堡子矿区容矿构造为总体向北倾的缓倾逆冲断层，延伸稳定，在盖县组碎屑岩与大石桥组上部大理岩硅-钙面上部碎屑岩中形成金矿体，而硅-钙面下部大理岩中则形成铅锌银矿体，不同矿区赋矿层位近于一致.NW走向的尖山子断裂是本区规模最大的陡倾断裂，长度超过13 km，并具有多期活动特征.该断裂早期以右行走滑为主，晚期为正断层，在成矿后还有明显活动，可能将白云-荒甸子矿区近东-西向容矿逆冲断裂带向南错移至扈家堡子-马隈子北-毛甸子一带，最大错断距离达6 km.根据对白云-小佟家堡子矿集区控矿构造及赋矿层位的综合分析，结合成矿后断裂活动的改造，提出了白云-荒甸子矿区以南和小佟家堡子金矿-风银大地银矿2个深部成矿有利区及扈家堡子-马隈子北-毛甸子和桃源村以南2个外围成矿有利区.Abstract: The Baiyun-Xiaotongjiabuzi ore concentration area is one main part of the Qingchengzi ore concentration areas in eastern Liaoning Province. It consists of Baiyun (Erdaogou,Sandaogou) and Huangdianzi gold ore deposits in the north and Linjiasandaogou,Xiaotongjiabuzi,Yangshu,Taoyuan gold ore deposits and Gaojiabuzi,Fengyindadi and Jiangjiagou Ag ore deposits in the south. The results show that the Baiyun (Erdaogou,Sandaogou) and Huangdianzi gold ore deposits in the north are controlled by east-west striking thrust fault system that is about 8 km long along its strike. The ore-hosting thrust fault system dips to south with an average dipping angle of 30°. It is composed of a main thrust fault and several paralleling thrust faults and is about 200 m wide. The main thrust fault cut through the foliations of Dashiqiao and Gaixian formations and other paralleling thrust faults are usually developed along foliations of Dashiqiao and Gaixian formations. The thrust faults are characterized by wave-like surface and the thrust surfaces with low angle are favorable areas for ore bodies. The Linjiasandaogou,Xiaotongjiabuzi,Yangshu,Taoyuan gold ore deposits and Gaojiabuzi,Fengyindadi and Jiangjiagou Ag ore deposits in the south are controlled by north-dipping low angle thrust fault. The ore-hosting thrust faults are developed near the contacts between the metaclastic rocks of Gaixian Formation and marbles of Dashiqiao Formation. Gold and Pb-Zn-Ag ore bodies exist within the thrust faults developed in the metaclastic rocks and marbles,respectively. The NW striking Jianshanzi fault is the largest and high angle fault in the area with a length over 13 km. Field investigation and kinematic analysis results show that the Jianshanzi fault is a multi-stage fault and served as dextral strike-slip in early stage and normal fault in late stage. After formation of the main gold and Pb-Zn-Ag ore deposits in the Baiyun-Xiaotongjiabuzi ore concentration area during the Triassic period,the Jianshanzi fault exhibited strong dextral strike-slip movement and the east-west striking ore-hosting thrust fault system in Baiyun-Huangdianzi ore deposits in west side of the Jianshanzi fault was most likely moved 6 km to south to the Hujiabuzi-north Maweizi-Maodianzi area in east side of the Jianshanzi fault. Based on the analysis results on the ore-controlling structures,ore-bearing strata and movements of the post-metallogenic faults,it is proposed south Baiyun-Huangdianzi ore deposits and Xiaotongjiabuzi-Fengyindadi as two deep metallogenic favorable areas,and Hujiabuzi-north Maweizi-Maodianzi and South Taoyuan village as two outside metallogenic favorable areas.
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图 1 白云‒小佟家堡子矿集区地质图
据辽宁省有色地质局一〇三队底图修改补充
Fig. 1. Geological map of the Baiyun-Xiaotongjiabuzi ore concentration area
图 2 白云-冯家堡子废弃采坑内近E-W向容矿逆冲断层及其内含矿石英脉
Fig. 2. East-west striking ore-hosting thrust faults and gold-bearing quartz veins in the mining pits from Baiyun to Fengjiabuzi
图 3 白云三道沟容矿逆冲断层分支现象
Fig. 3. Branch structures of the ore-hosting thrust fault in Sandaogou, Baiyun
图 4 白云-荒甸子金矿区周边近E-W向主逆冲断层面下盘陡倾片岩及含砂质条带状大理岩
Fig. 4. Steep dipping schists and marbles at the footwall of the east-west striking ore-hosting thrust fault system (main surface) near Baiyun-Huangdianzi ore deposits
图 5 横穿白云三道沟-桃源铅锌矿示意性剖面图
Fig. 5. Sketch cross section from Sandaogou, Baiyuan to Taoyuan Pb-Zn ore deposit
图 6 白云三道沟含矿逆冲断层
Fig. 6. Wave-like surface of the ore-hosting thrust fault in Sandaogou, Baiyun
图 7 白云-小佟家堡子矿集区含矿断裂带内炭质断层泥及炭质片岩(或石墨)
Fig. 7. Carbonaceous-rich gouge and schist (or graphite) within the ore-hosting faults in the Baiyun-Xiaotongjiabuzi ore concentration area
图 8 白云金矿区废弃采坑近E-W走向容矿逆冲断层被近S-N向断层右行错断
Fig. 8. Right-lateral movement of the east-west stiking ore-hosting thrust fault by the south-north striking post-metallogenic fault
图 9 白云二道沟坑道不同中段矿体平面图
Fig. 9. Planes of ore bodies in different mining levels from Erdaogou, Baiyuan ore deposit
图 10 横穿小佟家堡子-桃源村示意性剖面图
Fig. 10. Sketch cross section from Taoyuan Village to Xiaotongjiabuzi
图 11 尖山子断裂及其运动学标志
Fig. 11. Field photographs of Jianshanzi fault and its kinematic indicators
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