吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (4): 1104-1118.doi: 10.13278/j.cnki.jjuese.201704111

• 地质与资源 • 上一篇    下一篇

治岭头金矿围岩蚀变特征及其意义

郝立波1, 吴超2,3, 赵新运1, 赵玉岩1, 陆继龙1, 魏俏巧1   

  1. 1. 吉林大学地球探测科学与技术学院, 长春 130026;
    2. 国土资源部地球化学探测技术重点实验室, 河北 廊坊 065000;
    3. 中国地质科学院地球物理地球化学勘查研究所, 河北 廊坊 065000
  • 收稿日期:2016-11-25 出版日期:2017-07-26 发布日期:2017-07-26
  • 通讯作者: 赵新运(1988),男,讲师,博士,主要从事地球化学研究工作,E-mail:zhaoxy15@jlu.edu.cn E-mail:zhaoxy15@jlu.edu.cn
  • 作者简介:郝立波(1961),男,教授,博士生导师,主要从事地球化学研究工作,E-mail:haolb@jlu.edu.cn
  • 基金资助:
    中国地质调查局项目（20089941）；中央级公益性科研院所基本科研业务费专项（AS2016P02）

Characteristics of Wall Rock Alteration of Zhilingtou Gold Deposit and Its Significance

Hao Libo1, Wu Chao2,3, Zhao Xinyun1, Zhao Yuyan1, Lu Jilong1, Wei Qiaoqiao1   

  1. 1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Key Laboratory of Geochemical Exploration, Ministry of Land and Resources, Langfang 065000, Hebei, China;
    3. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, Hebei, China
  • Received:2016-11-25 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by Project of the China Geological Survey (20089941) and Basal Research Fund of Central Public Welfare Scientific Institution(AS2016P02)

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摘要： 治岭头金矿位于浙江省遂昌县，是我国东南沿海的一座大型金矿床。该矿床围岩蚀变发育，类型有硅化、绢云母化、绿泥石化、黄铁矿化、方解石化和菱锰矿化。从矿体到围岩可以划分为4个蚀变带：强硅化带、弱硅化-黄铁绢英岩化带、绢云母化带和绿泥石化带。沿矿体走向，蚀变强度整体上呈波动性变化，与矿体呈透镜状产出特征一致。硅化、黄铁矿化、菱锰矿化与金矿化关系最密切，而且这些蚀变具有相似的变化趋势。绢云母化和绿泥石化与硅化的变化趋势不同，且与矿化关系不密切。另外，矿区还发育方解石化，且强度较弱。金矿化及围岩蚀变均发育在古元古界八都群变质岩中，未进入上覆中生代火山岩盖层，证明治岭头金矿成矿作用与中生代火山活动无关。定量计算结果显示：蚀变过程中Al2O3、TiO2、P2O5为惰性组分；SiO2、CaO、MnO、Au、Ag、Cu、Pb、Zn等为明显带入组分；Fe2O3、FeO、MgO、K2O、Na2O、Ba、Sr等为明显带出组分。根据围岩蚀变和稳定同位素分析，推断治岭头金矿原始成矿热液流体应是富含Si、Ca、Mn、Au、Ag、Cu、Pb、Zn等组分的岩浆热液，后期有大气降水的加入。

关键词: 治岭头金矿, 围岩蚀变, 蚀变分带, 质量迁移

Abstract: Located in Suichang, Zhejiang Province, Zhilingtou deposit is a large gold deposit on the southeastern coast of China. Its wall rock alterations are widespread in Zhilingtou gold deposit, such as silicification, sericitization, chloritization, pyritization, calcitization and siderite manganese mineralization. From ore body to wall rock, the alteration zone can be divided into quartz-rich, beresitization with quartz, sericite, and chlorite zones. In general, the alteration degree fluctuates with the distance to ore bodies, and forms a shape of lens just as the shape of an ore body surrounded. Gold mineralization is associated with quartz, pyrite, and rhodochrosite alterations. Quartz alteration, pyrite alteration, and rhodochrosite alteration degrees have a similar changing trend; while the sercite and chlorite alteration trend is different. In addition, the deposit develops a low degree of calcite alteration. Both gold mineralization and wall rock alteration occurred in the Paleoproterozoic metamorphic rocks of Badu Group, and did not enter overlying Mesozoic volcanic rocks, which indicates that the formation of the deposit has no relation with the Mesozoic volcanic activities. The elemental quantitative analysis showed that Al2O3, TiO2 and P2O5 were inactive components, SiO2, CaO, MnO, Au, Ag, Cu, Pb, Zn, etc. were gathered,and Fe2O3, FeO, MgO, K2O, Na2O, Ba, Sr, etc. were lost from the wall rocks in alteration process. According to the alteration features and stable isotope analysis, we conclude that the primitive hydrothermal ore-forming fluids of the deposit were mainly of magmatic water with enrichment in Si, Ca, Mn, Au, Ag, Cu, Pb, Zn, etc., and some meteoric water were added to the fluids in ore forming process.

Key words: Zhilingtou gold deposit, wall rock alteration, alteration zone, mass transport

中图分类号: 

  • P618.51
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