剪切蚀变与物质迁移及金的富集——以胶东矿集区为例

邓军; 方云; 杨立强; 丁式江; 肖荣阁; 彭润民; 王建平

剪切蚀变与物质迁移及金的富集——以胶东矿集区为例

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质大学工程学院, 武汉 430074
3.
中国科学院地质与地球物理研究所, 北京 100101

基金项目:

国土资源部“百名跨世纪科技人才培养计划”基金 9808

国家重点基础研究发展规划项目 G1999043206

国家攀登计划项目 95-预-25

国家攀登计划项目 95-预-39

详细信息

作者简介:
邓军, 男, 1958年生, 教授, 博士生导师, 矿床学和构造地质学专业, 主要从事区域构造、成矿流体及成矿动力学的教学和科研工作

中图分类号: P542;P618.51
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出版历程
- 收稿日期: 2000-03-26
- 刊出日期: 2000-07-25

ORE-FORMING DYNAMICS OF TECTONIC REGIME TRANSFORMATION AND MULTI-LAYER FLUID CIRCULATION

1.
Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
3.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China

摘要

摘要: 运用定量计算和计算机模拟与传统地质学相结合的方法, 研究胶东矿集区中剪切构造变形和围岩蚀变与物质迁移及金矿富集的相互关系.结果表明, 在剪切-蚀变作用过程中, 各种物质组分发生了不同程度的迁移, 存在较大的流体/岩石比值, 体积应变为增加型.成矿作用发生的最主要原因是剪切挤压-拉张构造作用引起的成矿元素活化→运移→富集.成矿早期, 形成以包体金为主的贫矿石; 成矿晚期, 形成含裂隙金和多金属细脉的富矿石.
- 剪切-蚀变 /
- 物质迁移 /
- 成矿作用
Abstract: In a metallogenic system, tectonism and fluid process occurred at the same time and therefore, they are coupled with each other. The action of ore-forming fluids is bound up with formation and evolution of ore-controlling structures. Structural-fluid temporal-spatial evolution track is, in essence, the mobilization, migration, aggregation and location process of ore-forming materials, i.e. the coupled process of structural fluid mineralization. In this paper, the geological analysis for the gold-deposit concentration region of Jiaodong, Shandong Province, China, is conducted with the Gresens' equation, Grant's isocon diagram and O'hara microelement calculation method, to reveal the interactions among the shear tectonic deformation, the wall-rock alteration, mass transfer and gold mineralization. The research results show that the shear deformation and hydrothermal alteration not only include the deformational condition, feature and mechanism of the shear zone, but also are related to the formation, component, flow or circulation model and flux of the fluids in the zone, resulting in the reallocation of elements and the migration of the chemical materials. During the shear-alteration process in the Jiaodong gold concentration area, all kinds of components were transferred in different amounts, the fluid-rock ratio was relatively high and the volume strain was of dilation type. The major reason for this mineralization is the mobilization, migration and enrichment of ore-forming elements induced by the shear compressive-extensional tectonism. The low-grade ores dominated by the inclusion gold were formed in the early ore-forming stage, while the high grade ores containing fissure gold and polymetallic veinlets were formed in the late ore-forming stage.
- shear-alteration /
- mass transfer /
- ore-forming process

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图 1 胶东焦家金矿根据Al₂O₃质量分数确定的等比线

a.片麻岩→红化花岗岩; b.红化花岗岩→绢英岩.w_Bⁱ, w_B^o分别代表剪切蚀变前后岩石组分的质量分数

Fig. 1. Grant's isocon diagram based on the mass fraction of Al₂O₃ in Jiaojia gold deposit of Jiaodong area

下载: 全尺寸图片幻灯片

图 2 胶东焦家金矿剪切-蚀变过程中相对于原岩含量的组分迁移柱状图

Fig. 2. Quantity of component migration during the process of shear-alteration in Jiaodong area of Shandong Province

下载: 全尺寸图片幻灯片

表 1 胶东焦家金矿蚀变岩石平均化学成分

Table 1. Mean chemical components of altered rocks in Jiaojia gold deposit of Jiaodong area

表 2 胶东夏甸金矿剪切-蚀变作用过程中相对于原岩组分迁移量、体积变异和流体流量

Table 2. Component transfer, volume variation and fluid flux during the process of shear-alteration in Jiaodong area of Shandong Province

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