| 王吉珺,冯文涛.玲珑金矿床特征和成矿模式[J].地质找矿论丛,1991,(2):18-35 |
| 玲珑金矿床特征和成矿模式 |
| THE LINGLONG GOLD ORE DEPOSIT AND THE METALLOGENIC MODEL |
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| DOI：10.6053/j.issn.1001-1412.1991.2. 003 |
| 中文关键词: 金矿地质 地球化学 成矿模式 |
| 英文关键词: |
| 基金项目: |
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| 中文摘要: |
| 玲珑大型金矿在成因上与底辟交代型花岗岩有关,受韧性剪切带控制,具有水平原生分带和垂向次生分带,地表发生氧化淋失和次生富集,伴随韧性—脆性断裂的阶段性演化发生多期成矿和七种蚀变类型八种矿物转化。通过硫、氧、氢、碳、铅同位素以及稀土元素、微量元素、气液包体地球化学研究证实成矿物质来源于胶东群矿源层。结合成矿的物化环境、地球化学规律,建立了矿源层、底辟交代花岗岩和韧性剪切—脆性叠加断裂三位一体的层控型成矿模式。 |
| 英文摘要: |
| The Linglong Gold ore deposit is a super-large size deposit ocurring in the Yanshanian diapiric replacement genetic granite i.e gneissic biotite-K-feldspar granite.It is strictly controled by a complicated fissure zone which is a ductile zone superimposed by brittle shearing.Potouqing fracture is the dynamic-heat center.Three primary mineralization are developed outward, pyrite quartz-veinlet mineralization-chalcopyrite pyrite-quartz vein mineralization-multi-sulfides-quartz vein mineralization.Long Period of weathering leaves verticle zonation of oxidized-leaching zone, semi-oxidizted-leachingzone and the prhoary zone.89% gold were leached away from oxidized-leaching zone and 48% goldin the semi-oxidized leaching zone is concentrated.Alterations, such as K-alteration, sericitisation,silicification and sericite-quartzitization take place along mineralized fractures.During the alterationsthere are 8 minerals were decomposed and transformed to new minerals.Electrum and native gold arefilled interstially in five occurrences.Therefore, gold tends to precipitate and concentrate in the placewhere pyrite is intensely cataclastic.Based on ore fabric, time-spatial distribution and mineral evolution three metallogenic epoch and five metallogenic stuges are recognized acompanied by fracturing activity (ductile-brittle).Quartz fluid inclusion study shows that ore-forming temperature range in 327-180℃; pressure, in 18.847-15.3Pa; Ph=7.6(±); Eh, in -85.54～0.75; salinity, in 0.14-0.02(wt%); mineralization degree, 4.8-1.2(MRg/L).Goldrich solution contains Na+, K+, Cl-,SO42-,CO2 With high mineralization degree and high salinity.lsotope analysis indicates that ore materials are derived from Jiaodong Group which was replaced and modified by granitic magma producingmobiliation of ore materials.Magmatic water mixed with meteroid water transported and concentratedthe ore materials.REE association also indicates the source of ore from Jinodong Group.Eu increase isone of the marks for concentration of gold.Temperature-spatial combination of Jiaodong Group, ductile fissure superimposed by brittle shearing and diapiric granite is the main orc-controling factor andthe motive force for the metallogenesis is the mobilization of the contincntal margin caused by theMesozoic Pacific Plate Movement.The typemorphic elements of Sr, Sb and Ni in quartz and infra-redspectral density are important information to ore prospect in Linglong Mine Area. |
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