胶东玲珑金矿田构造蚀变岩测量与成矿预测

Tectonic altered rock measurement and metallogenic regularity of Linglong gold field,Jiaodong

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。

The “Linglong Orefield 1 ： 10000 Geological Map” completed in 1984 had established the basic framework of geology and mineral resources in this area. After 30 years of exploration and researches on mining, ore field structure, rocks and minerals, a lot of progress have been made and a number of new information have been accumulated. The main task for the orefield is deep prospecting. In order to summarize geological prospecting work for decades and to meet the need in deep prospecting, after many years of practical observation and analysis, we completed the “Linglong Gold Mine structural alteration mineralization map of Zhaoyuan City, Shandong Province”. The Linglong gold orefield developed the Linglong- Jiaojia style gold deposit-the continental posvmagmatic hydrothermal alteration shear zone sulfide quartz vein-beresite cataclastic alteration type of gold deposit. This type of deposit was affected by fracture zones, and the oreforming geological body is a beresitic altered rock belt. Using geological survey and research methods on structural alteration, a number of structural-petrofacies cross-sections, have been made in the field work and carried out 1 ： 2000 and 1 ： 10000 mapping. The results showed that （1） the ore field is located outside of the contact zone of the Luanjiahe intrusive body, the host rock is mainly Linglong gneissic biotite granite, and the NWW-SEE trending gneissie structure of the granite reflects the trace of the Jiaodong basement tectonics; that （2） the fault-related alteration zone formed the three alteration and mineralization belts in the orefield, and the NE-trending fault alteration zone was cut by those developed in other directions; that （3） according to the scale of alteration belt controlled by the fluid increasing both from west to east and from north to south, the large scale ore deposits must be concentrated in the southeastern part of the orefield where structural alteration zones are large in scale, deeply concealed and most perspective for metallogenesis. The compilation of “Linglong Gold Mine structural alteration mineralization map of Zhaoyuan City, Shandong Province” reflects the new information of the geological structure of the area, which effectively supports the deep ore-prospecting in the next coming stages. The large-scale stucture petrofacies geological mapping and prospecting method based on metallogenic geological events has great significance in deep and peripheral ore prospecting, worthy of further deepened study and to be widely used in practice.