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构造应力场转换的成矿地球化学响应

TRANSITION OF TECTONIC STRESS FIELDS AND ITS EFFECTS OF METALLOGENIC GEOCHEMISTRY ON MULTI-SCALES

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【作者】 杨立强熊章强邓军张中杰王建平李新俊

【Author】 YANG Li-qiang~1,XIONG Zhang-qiang~2,DENG Jun~3,ZHANG Zhong-jie~1, WANG Jian-ping~3 and LI Xin-jun~1 (1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100101,China;2.Department of Detection and Information Technology,East China Institute of Technology,Fuzhou 344000,China;3.Faculty of Earth Sciences and Mineral Resources,China University of Geosciences,Beijing 100083,China)

【机构】 中国科学院地质与地球物理研究所东华理工学院探测与信息技术系中国地质大学地球科学与资源学院

【摘要】 以剪切带型金矿为例,基于对中国东部胶东西北部地区及其典型金矿田、金矿床构造应力场与成矿地球化学场的详细研究结果,初步阐释了它们在多重时-空间尺度上的耦合关系。区域尺度上,应力极值区不利于成矿,金矿床就位于应力梯级带,尤其是不同方向应力梯级带的交汇部位。矿田尺度上,成矿物质有从应力高值区向低值区运移的趋势,成矿主期应力梯度的增大有利于成矿元素进一步浓集,应力梯级的强烈变化地段(或时段)往往形成金属元素的大量堆积。矿床尺度上,成矿物质的运移受不同方向剪应力梯级带的叠加影响,金属元素就位于NE和NW向应力梯级带交汇部位缓坡带一侧的次级梯级带之上。多重时-空尺度成矿动力学的深入研究,将可能揭示出这种非线性效应的丰富内涵。

【Abstract】 Based on tectonic stress fields and metallogenic geochemical fields in multi-scales of area,orefields and ore deposits in northwest Jiaodong,China,the authors have discussed the coupling relationship between the transition of tectonic stress fields and its metallogenic geochemical fields on multi-scales.Regionally the regions of stress maximum and minimum are adverse to ore formation.Gold deposits are located in the gradient zones of shear stress,especially in the intersectant places of different stress gradient zones.On the scale of orefield,the metallogenic materials trend to migrate from the regions of higher stress value to the places of lower stress value.The increase of stress gradient in the main metallogenic stage makes a contribution to concentrating of metallogenic elements.Generally,metal elements have emplaced in the places(or the periods) where(or when) stress gradient changes sharply.On the scale of ore deposit,the stress gradient zones of NE strike and the stress gradient zones of NW strike control together the migration of metallogenic materals.Metal elements emplace in the subgradient zones on the gentle side of the intersectant places of the stress gradient zones of NE strike and the stress gradient zones of NW strike.Theses show that the nonlinear effects of ore formation exist on multi temporal and spatial scales,and more researches of the dynamics of this phenomenon could be useful for bringing to light its essence.

【基金】 中国科学院知识创新工程重要方向项目(编号:KZCX2-109);国家自然科学基金资助项目(编号:40172036);教育部科技研究重点项目(编号:01037)
  • 【会议录名称】 中国科学院地质与地球物理研究所二○○三学术论文汇编·第二卷(青藏高原)
  • 【会议名称】中国科学院地质与地球物理研究所2003学术年会
  • 【会议时间】2003-12-01
  • 【会议地点】中国北京
  • 【分类号】P618.51
  • 【主办单位】中国科学院地质与地球物理研究所(Institute of Geology and Geophysics Chinese Academy of Sciences)
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