The tectono-metallogenic characteristics of uplift-detachment belt of magmatic core complex in Linglong gold field, Jiaodong area
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摘要:
玲珑金矿田位于胶东地区玲珑岩浆核杂岩体东部, 该杂岩体是由焦家断裂带和招远-平度断裂带所围限的具有复杂成因、多种来源和不同岩浆演化序列的一套岩体组合。在矿田内, 该杂岩体的内核由玲珑型似片麻状黑云母花岗岩和郭家岭型似斑状花岗闪长岩组成; 上覆盖层为栾家河型中粗粒二长花岗岩及少量太古宙变质岩; 拆离带构造位于玲珑型似片麻状黑云母花岗岩体和栾家河型中粗粒二长花岗岩体的接触带, 是递进变形改造形成的破头青断裂带。破头青拆离带为上陡下缓的铲式断裂, 转折端深度为-300~-500 m, 拆离带往北东方向的转折端深度逐渐加深。为了解玲珑金矿田岩浆核杂岩隆起-拆离带构造演化与成矿特征, 对花岗岩成岩构造及后期脆韧性变形特征的观测结果显示, 断裂构造由成矿前期的挤压剪切转变为成矿期的伸展拆离, 韧脆性变形阶段均经历了多次应力转折。区内郭家岭型似斑状花岗闪长岩成岩年龄(130~125 Ma)与拆离带塑性变形阶段(137~123 Ma)在时间上具有一致性, 拆离带脆性变形阶段(123~108 Ma)与矿田大规模成矿事件(125.8~105 Ma)的时间基本一致, 显示了玲珑金矿田的成矿与郭家岭型似斑状花岗闪长岩的隆起构造形成过程具有显著的关联性。玲珑金矿田岩浆核杂岩隆起-拆离带的几何学、运动学、年代学特征, 展示了该构造的成控矿规律, 可用于指导玲珑金矿田的深部找矿。
Abstract:The Linglong gold field is located in the eastern part of the Linglong magmatic core complex of Jiaodong area, which is a set of rock mass combinations with complicated genesis, multiple sources and different magmatic evolution sequences surrounded by the Jiaojia fault belt and the Zhaoyuan-Pingdu fault belt.In the ore field, The core of the complex rock mass is formed by Linglong-type gneiss-like biotite granite and Guojialing-type porphyryite-like diorite, and the upper cover is Luanjiahe-type coarse-grained monzonitc granite and a small amount of Archean metamorphic rocks.The detachment belt is developed between the Linglong-type gneiss-like biotite granite pluton and the Luanjiahe-type coarse-grained monzonitc granite pluton which was formed by the progressive deformation and transformation of the Potouqing fault belt.The Potouqing detachment belt is a steep and slow shovel-type fracture, the depth in turning end of which is between -300 m and -500 m, and the turning depth of the detachment belt towards the north and east directions is gradually deepening.In order to understand the structural evolution and mineralization characteristics of the uplift detachment belt of the Linglong magmatic core complex, the observation results of the diagenetic structure and brittle ductile deformation characteristics of granite in the later stage show that the fault structure has undergone multiple stress turns from compression shear in the early stage of mineralization to extension detachment during the mineralization period. The diagenetic age (130~125 Ma) of the Guojialing-type porphyry-like diorite in the ore field is coincided with the plastic deformation stage of the detachment belt (137~123 Ma), and the brittle deformation stage of the detachment belt (123~108 Ma) is basically coincided with the large-scale mineralization event (125.8~105 Ma) of the mine, showing the significant correlation between the structural mineralization of the magmatic core complex uplift-detachment belt in the Linglong gold field and the uplift structure of the porphyry-like granodiorite of the Guojialing type.The geometric, kinematics and chronological characteristics of the magmatic core complex uplift-detachment belt of Linglong gold field demonstrate the structural ore-controlling regularity, which can be used to guide the deep prospecting of Linglong gold field.
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Key words:
- Linglong gold field /
- magmatic core complex /
- detachment belt /
- tectonic ore-controlling
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图 5 玲珑金矿田构造活动、成岩和成矿年龄(据陈衍景等，2004；Charles et al.，2013；吕古贤等，2013；阳琼艳，2013；Wu et al.，2020)
Figure 5.
表 1 玲珑金矿田似片麻理产状统计
Table 1. Statistics of gneissoid occurrence in Linglong gold ore field
测量产状位置 产状数据 数据来源 破头青剖面糜棱岩 128°∠25°，190°∠30°，140°∠50°，125°∠52°，140°∠26°，135°∠37° 吕古贤等，2016 断裂带 134°∠80°，160°∠45°，150°∠43°，132°∠38°，124°∠42° 吕古贤等，2016 九曲蒋家北北东向断裂蚀变带 45°∠40°，44°∠42°，55°∠50°，43°∠30°，50°∠48°，40°∠29°，53°∠47°，29°∠13°，42°∠25°，32°∠15° 实测 破头青北部北东东向断裂蚀变带 210°∠30°，41°∠27°，60°∠33°，45°∠21°，53°∠30°，65°∠25°，60°∠30°，63°∠28°，61°∠28°，70°∠30°，55°∠30°，67°∠28°，51°∠28°，67°∠26°，65°∠25°，67°∠28° 实测 破头青断裂南部北东向断裂蚀变带 150°∠16°，225°∠28°，152°∠20°，160°∠30°，180°∠35°，179°∠33°，185°∠37°，150°∠50，152°∠47°，145°∠34° 实测 大开头-670中段主巷 310°∠20°，115°∠26°，110°∠30°，112°∠30°，122°∠25°，150°∠22°，155°∠19°，130°∠18°，120°∠24°，105°∠23°，125°∠22°，30°∠30°，104°∠20°，50°∠22°，30°∠18°，40°∠20°，28°∠23°，20°∠22°，70°∠30°，25°∠30°，15°∠15°，60°∠22°，70°∠35°，140°∠23°，135°∠24°，46°∠27°，124°∠29°，66°∠31°，42°∠27°，132°∠28° 实测 
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