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.

胶东大开头金矿区位于玲珑断裂和破头青断裂夹持区.48号脉位于玲珑金矿田大开头矿区的西南侧,金矿床为石英脉型—蚀变岩型,围岩有二长花岗岩、钾化花岗岩、绢英岩化花岗岩、绢英岩、黄铁绢英岩、煌斑岩等.本文以玲珑金矿田大开头矿区48号脉矿体两侧钾化花岗岩中钾长石为研究对象,通过X射线粉晶衍射、电子探针等方法研究钾长石晶体结构态及其类别、形成温度与稳定结构态温度,研究结果表明:①48号脉矿体中钾长石应为最大微斜长石;②矿脉两侧钾化蚀变时的温度为410℃～470℃,稳定结构态温度为244℃～274.6℃;③钾长石形成稳定结构态的热液温度环境有利于金的沉淀富集,该类钾长石是深部找矿的良好标志.

矿田系指矿床密集分布,成矿作用集中发育,且在时间、空间和构造建造上具有紧密联系的矿化赋存区段(克列特尔,1956;沃尔弗逊,1966;),相当于Ⅴ级成矿区划单元(陈毓川等,1989;朱裕生等,1999). 1 矿田地质学的概念和研究内容

对几十年来地质找矿工作进行总结,支撑深部找矿的重大难题,经过多年的实际观测和分析研究,完成了“山东省招远市玲珑金矿构造蚀变成矿图”.玲珑金矿田发育玲珑-焦家式金矿——陆内岩浆期后热液蚀变剪切带硫化物石英脉-黄铁绢英岩蚀变破碎岩型金矿.该类矿床受断裂破碎带影响,成矿地质体是黄铁绢英岩质蚀变岩带.研究应用构造蚀变岩的地质测量和研究方法,实测了大量的构造岩相剖面,开展了1∶2 000和1∶10 000的填图.结果显示:(1)矿田处于滦家河岩体外接触带,赋矿围岩主要是玲珑似片麻状黑云母花岗岩.花岗岩的似片麻理走向显示北西西至南东东向分布,带有胶东基底的构造痕迹.(2)断裂蚀变矿化带控制了金矿的分布规律,它们受到后期构造的改造.(3)图中从西到东、从北到南,流体交代蚀变岩的规模都逐渐增大,因此,通过断裂蚀变岩的发育情况,可知较大矿床集中在矿田的东南部.东南部构造及蚀变带规模大,矿体埋藏深,有良好的成矿远景.“山东省招远市玲珑金矿构造蚀变成矿图”的编制,反映了区内控矿构造的新资料.关于矿田找矿预测的靶区得到了探矿工程的验证,并有力地支持了今后一个阶段的深部找矿问题.以成矿地质事件为基础的大比例尺构造岩相地质填图及找矿方法,具有重要的成矿研究和深部外围找矿意义,值得进一步深化和推广.

针对玲珑金矿西山矿区的几条主要生产矿脉,根据中深部获得的新地质资料,改变探矿工程布局,加密探矿网度,筛选出浅部老中段沿脉工程漏掉的临近平行单体支脉,同时又在部分主脉不同的线位区域发现可开采规模的交汇支脉,改变以往西山矿区部分矿脉单脉规律排列的认识,对支脉的成矿规律及脉群交汇处成矿靶区进行分析验证,取得良好的探矿效果.

With the implementation of exploration engineering in the deep zone of the middle area, the Linglong gold mine faces risk of resource reserves and ore grade decreasing sharply. Through the comparative analysis of resources assessment and cost, new useful ways to solve the problem are presented. Make full use of the low grade ore, and set up a residual high grade residual ore recovering team with experience and skill of private mining to exploit more high grade ore. In practical applications, the scheme improved the output of gold, reduced the risk and cost, then obtained remarkable economic effects. So it can provide reference for other gold mines in China.

In order to solve the crisis of mines resources,characteristics of No.51 vein in Linglong gold mine field are carefully researched,and obtain better understant about vein metallogenic features and ore-forming regularity in the deep.Using the characteristics of vein rocks,we find that the No.51 vein is broken,dislocated,interspersed,displaced and parallel intergrowth by lamprophyre in the later period in deep metallogenic conditions,getting good effect in vein rocks prospecting.Combining with the examples of production practice,the comprehensive utilization value is analysised,metallogenic target areas are forecasted in Vein No.51,we suggest that the Vein No.51 is still with large mining use value.Thus,the vision of geological reserves,production and service life of mine are expanded,problems of the continuation production are resolved.

Potouqing fault was the first-grade fracture controlling orebodies,its alterative zones from the hanging wall-rock to the ore-body include potash zone,sericitization zone,silicification zone,pyritation zone etc.The results of REE and elements related to mineralization in Potouqing fault show that REE patterns appear as LREE-rich type,with better fractionation of lighter and heavy REEs and La/Lu=8.37-65.03.Ore-forming fluids have Eu abnormity,withδEu=0.67-1.46 and without Ce abnormity.Au is strongly correlated to Ag,As,Cu,Mo which is the result of the same metallogeny.

Through renewed analysis and evaluation of the cut-off grade and the lowest industrial grade,Linglong gold deposit mined the low-grade ore belong to submarginal ores reasonably,the industrial and prospective geologi-cal reserves had increased much,and it provided resource quarantee for the sustainable development of Linglong gold deposit.It is beneficial to alleviate the situation of shortage of mineral resources,promote the mine developing constantly,and can be widely used in other mines.

Mineral vein of Dongshan deposit in Linglong gold field is numerous,the relation of mineral vein is complex and mineral vein have the obvious phenomenon of convergence,separation,reunion.Through the research of distributed regulation,geology characteristic,country rock alteration,mineral vein with rock vein of vein No.18,47,50,176N,48,as well as comparisons of the complexion of space distribution,occurrence,and grade variation Metallogenesis is summarized,finding out the mineral enrich to gather the beneficial part,which provides geological references for exploration.