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江西省相山矿田横涧-岗上英矿床构造控矿特征分析

张鸿 陈正乐 杨农

张鸿, 陈正乐, 杨农, 2009. 江西省相山矿田横涧-岗上英矿床构造控矿特征分析. 地质力学学报, 15 (1): 36-49.
引用本文: 张鸿, 陈正乐, 杨农, 2009. 江西省相山矿田横涧-岗上英矿床构造控矿特征分析. 地质力学学报, 15 (1): 36-49.
ZHANG Hong, CHEN Zheng-le, YANG Nong, 2009. STRUCTURAL CONTROL OVER THE ORE IN HENGJIAN-GANGSHANGYING DEPOSITS IN XIANGSHAN ORE FIELD, JIANGXI PROVINCE. Journal of Geomechanics, 15 (1): 36-49.
Citation: ZHANG Hong, CHEN Zheng-le, YANG Nong, 2009. STRUCTURAL CONTROL OVER THE ORE IN HENGJIAN-GANGSHANGYING DEPOSITS IN XIANGSHAN ORE FIELD, JIANGXI PROVINCE. Journal of Geomechanics, 15 (1): 36-49.

江西省相山矿田横涧-岗上英矿床构造控矿特征分析

详细信息
    作者简介:

    张鸿(1967-), 男, 1990年毕业于中国地质大学(武汉), 高级工程师, 从事铀矿地质工作。电话:0791- 5996722;E-mail:zhanghong270@163.com

  • 中图分类号: P613

STRUCTURAL CONTROL OVER THE ORE IN HENGJIAN-GANGSHANGYING DEPOSITS IN XIANGSHAN ORE FIELD, JIANGXI PROVINCE

  • 摘要: 横涧-岗上英铀矿床产在相山大型塌陷式火山盆地的北部, 区域NE向、EW向断裂构造与火山构造复合控制次花岗斑岩体和铀矿床的定位, 矿区次花岗斑岩的产出明显受到高角度逆断层的制约, 铀矿化主要受构造裂隙控制, 含矿裂隙带沿斑岩体内外接触带呈弧形展布。依据横涧-岗上英地区次花岗斑岩岩体及矿体空间展布及产状特征, 厘定了控岩构造系统, 通过分析构造裂隙特征及其与铀矿化的关系, 划分了成矿前、成矿期、成矿后构造体系, 初步认为矿区的构造演化可分为三期6个阶段。

     

  • 图  1  赣杭火山岩带西段地质示意图

    1.上白垩统红色砂砾岩; 2.上侏罗统火山岩系; 3.上三叠统-下侏罗统长英质砂岩、页岩夹煤层; 4.上古生界砂岩、页岩; 5.震旦系变质岩; 6.次花岗斑岩; 7.燕山期花岗岩; 8.印支期花岗岩; 9.加里东期花岗岩; 10.深断裂及一般断裂; 11.研究区位置

    Figure  1.  Geological sketch of the west segment of Ganhang volcanic zone

    图  2  相山矿田北部区域断裂、火山环状断裂及次火山岩复合控矿示意图

    1.鹅湖岭组上段碎斑熔岩; 2.鹅湖岭组下段砂岩; 3.打鼓顶组上段流纹英安岩; 4.打鼓顶组下段砂岩; 5.震旦系变质岩; 6.次花岗斑岩; 7.断层; 8.火山层间离张构造; 9.地层整合、不整合界线; 10.中、小型铀矿床; 11.研究区位置

    Figure  2.  Schematic diagram of compound control over ore deposits of regional volcanic ring-shaped faults and subgranitic porphyry at north of Xiangshan

    图  3  横涧-岗上英地区地质示意图

    1.第四系; 2.碎斑熔岩; 3.流纹英安岩; 4.紫红色砂岩; 5.片岩; 6.次花岗斑岩; 7.逆、平移断层; 8.火山离张、火山塌陷构造; 9.推覆构造; 10.大、中型矿床; 11.小型矿床; 12.矿点

    Figure  3.  Geological sketch of Hengjian-Gangshangying area

    图  4  横涧-岗上英矿床水平断面示意图

    1.流纹英安岩; 2.砂岩、砂砾岩; 3.片岩; 4.逆冲推覆体; 5.次花岗斑岩; 6.断裂; 7.矿体

    Figure  4.  Schematic diagram of orebodies level projection in Hengjian-Gangshangying deposit

    图  5  横涧-岗上英地区次花岗斑岩体空间分布

    1.地表斑岩体界线; 2.-3m标高斑岩体界线; 3.-163m标高斑岩体界线; 4.一般断裂; 5.逆断层; 6.碎斑熔岩底板等高线; 7.勘探线及编号

    Figure  5.  Spatial distribution of subgranitic porphyry in Hengjian-Gangshangying deposit

    图  6  次花岗斑岩体与铀矿化关系剖面

    1.碎斑熔岩; 2.流纹英安岩; 3.紫红色砂岩; 4.石英云母片岩; 5.次花岗斑岩; 6.地质界线; 7.不整合界线; 8.铀矿体

    Figure  6.  Profile of relation between U-mineralization and subgranitic porphyry

    图  7  控制次花岗斑岩断裂构造示意图

    1.流纹英安岩; 2.紫红色砂岩; 3.片岩; 4.次花岗斑岩; 5.推测逆断层; 6.77m斑岩体界线; 7.-43m斑岩体界线; 8.-163m斑岩体界线; 9.矿井及编号; 10.勘探线及编号

    Figure  7.  Schematic diagram of faults controlling subgranitic porphyry

    图  8  两条裂隙交叉处破碎形成的破碎带(坑道沿脉的一段)

    Figure  8.  Shatter zone at the infall between two fissures

    图  9  坑道剪切裂隙及旁侧羽状裂隙

    Figure  9.  Shear fissures and plumose fissures near the sap

    图  10  坑道中主裂隙与倾向相反羽状裂隙

    Figure  10.  Schematic diagram of main fissures and reversed trend plumose fissures at the sap

    图  11  矿区多期次矿化蚀变叠加分布

    1.次花岗斑岩; 2.钠长石化; 3.铀-赤铁矿化; 4.铀-萤石化; 5.蚀变渐变界线; 6.裂隙

    Figure  11.  Superimposition of multi-stages mineralization and alteration in the ore zone

    图  12  角砾状红化矿石示意图

    1.钠长石化; 2.绿泥石化; 3.赤铁矿化及铀-赤铁矿角砾; 4.萤石化; 5.裂隙; 6.蚀变带界线

    Figure  12.  Sketch of brecciated structure hematitization Uranium-ore

    图  13  网状裂隙控制的菱形矿体剖面

    1.打鼓顶组下段紫红色砂岩; 2.次花岗斑岩; 3.赤铁矿化; 4.萤石化; 5.裂隙; 6.钻孔

    Figure  13.  Schematic section of diamond ore bodies controlled by network fissures

    图  14  荷上村鹅湖岭组碎斑熔岩中发育的共轭剪节理

    Figure  14.  Conjugated shear joint growing in acidic lava in Ehuling Formation at Heshang village

    图  15  张扭节理及其旁侧的羽状张节理

    Figure  15.  Tension-torsion joint and pinnate tension joint alongside

    图  16  岗上英井下-3m中段906矿体控矿断层面

    (控矿NNE向破碎带断层面见两期擦痕, 早期擦痕为近似水平左旋张扭, 晚期为沿倾向拉张正断, 反映断层经多期构造活动)

    Figure  16.  The fault surface controlling 906 ore-body at -3 m segment in Gangshangying sap

    图  17  -43 m中段147矿体(EW-NWW)向断裂破碎带素描图

    Figure  17.  Sketch of EW-NWW fracture zone in Ore-body 147 at -43 m segment

    表  1  横涧-岗上英地区构造演化

    Table  1.   Structural evolution in Hengjian-Gangshangying area

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  • 收稿日期:  2008-06-16
  • 刊出日期:  2009-03-28

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