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北武夷生米坑铅锌矿床地质地球化学特征与成因探讨

罗平 吴淦国 张达 狄永军 王长明 王永庆

罗平, 吴淦国, 张达, 等, 2009. 北武夷生米坑铅锌矿床地质地球化学特征与成因探讨. 地质力学学报, 15 (4): 349-362.
引用本文: 罗平, 吴淦国, 张达, 等, 2009. 北武夷生米坑铅锌矿床地质地球化学特征与成因探讨. 地质力学学报, 15 (4): 349-362.
LUO Ping, WU Gan-guo, ZHANG Da, et al., 2009. GEOCHEMISTRY AND GENESIS OF SHENGMIKENG LEAD-ZINC DEPOSIT IN NORTHERN WUYI, EASTERN CHINA. Journal of Geomechanics, 15 (4): 349-362.
Citation: LUO Ping, WU Gan-guo, ZHANG Da, et al., 2009. GEOCHEMISTRY AND GENESIS OF SHENGMIKENG LEAD-ZINC DEPOSIT IN NORTHERN WUYI, EASTERN CHINA. Journal of Geomechanics, 15 (4): 349-362.

北武夷生米坑铅锌矿床地质地球化学特征与成因探讨

基金项目: 

中国地质调查局地质调查项目 2003102000

中国地质调查局地质调查项目 1212010533105

中国地质调查局地质调查项目 1212010813064

详细信息
    作者简介:

    罗平(1965-), 男, 博士, 教授级高级工程师, 长期从事地质矿产勘查、成矿区划及管理工作。E-mail: luoping-srdky@163.com

  • 中图分类号: P59

GEOCHEMISTRY AND GENESIS OF SHENGMIKENG LEAD-ZINC DEPOSIT IN NORTHERN WUYI, EASTERN CHINA

  • 摘要: 生米坑铅锌矿床位于北武夷中生代火山岩带的黄岗山火山盆地内, 已知铅锌矿体呈脉状产于侏罗系上统鹅湖岭组流纹质熔结凝灰岩的断裂内, 或呈细脉——浸染状分布于钾质粗面斑岩内, 发育钾长石化、绿泥石化、硅化等蚀变。地球化学特征显示矿区火山——侵入岩属于贫钠富钾的S型花岗岩, 其w(SiO2)值为62.42%~78.02%、w(K2O +Na2O)值为7.66%~9.13%、w(K2O)/w(Na2O)比值为1.18~2.62、里特曼指数δ为1.67~3.78;矿区岩石LREE/HREE比值平均为10.94×10-6, 属于轻稀土富集型; Eu普遍亏损, 特别是熔结凝灰岩、黑云母花岗岩δEu<0.31, 表明经历了显著的斜长石的分离结晶作用; 自早至晚主阶段岩浆活动稀土总量逐渐降低。从∑REE总量值、δEu值、地球化学参数及标准稀土元素配分模式图上看, 生米坑铅锌矿化蚀变岩与钾质粗面斑岩具有密切的成因联系。钾质粗面斑岩锆石(SHRIMP)年龄138.3±1.4 Ma, 表明矿床形成于燕山期白垩纪早期, 矿床成因类型属次火山热液型铅锌矿床。

     

  • 图  1  北武夷火山岩带之天华山———黄岗山火山盆地区域地质简图

    1.第四系; 2.白垩系; 3.上侏罗统; 4.中侏罗统—上三叠统; 5.上古生界; 6.下古生界; 7.前古生界; 8.燕山晚期侵入岩; 9.燕山早期第二阶段侵入岩; 10.燕山早期第一阶段侵入岩; 11.火山盆地; 12.背斜轴; 13.向斜轴; 14.压性、压扭性断裂; 15.张性、张扭性断裂; 16.帚状、旋转构造; 17.性质不明断裂; 18.流面构造产状; 19.片麻理构造产状; 20.银铅锌矿床; 21.铅锌矿床; 22.采样位置及编号

    Figure  1.  Geological sketch map of Tianhuashan-Huanggangshan volcanic basin in Northern Wuyi Volcanic Belt

    图  2  北武夷地区生米坑铅锌矿床地质简图

    1.侏罗系上统鹅湖岭组(J3e)流纹质熔结凝灰岩; 2.侏罗系下统水北组(J1s)砂页岩; 3.流纹斑岩; 4.钾质粗面斑岩; 5.喷发不整合地质界线侵入接触界线; 6.蚀变界线; 7.正断层及编号; 8.逆断层及编号; 9.实测矿体及编号; 10.绿泥石化、绿帘石化、方铅矿/闪锌矿; 11.钻孔/平硐及编号; 12.勘探线及编号

    Figure  2.  Geological sketch map of Shengmikeng Lead-Zinc Deposit in Northern Wuyi area

    照片1  流纹质熔结凝灰岩具假流纹构造, 基质由玻璃质—隐晶质组成, 具假流纹构造, 绕晶屑而行

    照片1.  Rhyolitic ignimbrite, Pseudo-rhyolite structure, with matrix composed of vitreous-crytocrystalline metarial

    照片2  钾质粗面斑岩具斑状结构, 斑晶为更—钠长石(Pl)、石英和暗色矿物, 基质具粗面结构, 钾长石微晶具定向性。正交偏光

    照片2.  Micrograph of potassic trachyte porphy ry, porphyritic structure.Phenocry sts are composed of oligoclase-albite quartz and dark mineral.Matrix is trachyte.Feldspar shows orientation

    图  3  矿体纵向厚度品位变化曲线图

    Figure  3.  Tendency chart of longitudinal thickness and grade of ore bodies

    图  4  矿体横向厚度品位变化曲线图

    Figure  4.  Tendency chart of lateral thickness and grade of ore bodies

    照片3  生米坑铅锌矿床V5号铅锌矿体

    a、b示钾化(Kfs)、绿泥石化(Chl)、碳酸盐化(Cal)蚀变; c示充填交代结构, 方铅矿(Gn)沿裂隙充填交代闪锌矿(Sp), 反射光(狄永军, 2008年); d示脉状铅锌矿体, 铅灰色、紫红色为铅锌矿, 白色为方解石脉, 灰绿色为强绿泥石化流纹质熔结凝灰岩。

    照片3.  V5 Lead-Zinc ore-body in Shengmikeng Lead-Zinc Deposit

    图  5  生米坑铅锌矿床稀土配分模式图

    Figure  5.  REE distribution pattern of Ore in Shengmikeng Lead-Zinc Deposit

    表  1  生米坑铅锌矿床方铅矿电子探针成分分析结果表(wB/%)

    Table  1.   Electron probe galena composition in Shengmikeng Lead-Zinc Deposit (wB/%)

    表  2  生米坑铅锌矿床闪锌矿电子探针成分分析结果表(wB/%)

    Table  2.   Electron probe sphalerite composition in Shengmikeng Lead-Zinc Deposit (wB/%)

    表  3  生米坑矿床岩石化学分析结果表(wB/%)

    Table  3.   Chemical analyses of rocks in Shengmikeng Lead-Zinc Deposit (wB/%)

    表  4  生米坑铅锌矿床岩石微量元素含量及富集系数一览表(10-6)

    Table  4.   Trace element content (10-6) and enrichment factor in Shengmikeng Lead-Zinc Deposit

    表  5  生米坑铅锌矿床岩石的稀土元素分析结果表(wB/10-6)

    Table  5.   REE contents of rocks in Shengmikeng Lead-Zinc Deposit (wB/10-6)

    表  6  生米坑铅锌矿床岩石的稀土元素总量及配分分析结果(wB/10-6)

    Table  6.   Chemical analyses of ∑REE (wB/10-6)and REE distribution of rock in Shengmikeng Lead-Zinc Deposit

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