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| 桂北老堡铅锌矿床的成因研究 | |
| 引用本文： | 梁金城,刘之葵,李晓峰,陆小平,蒙龙华,李文杰.桂北老堡铅锌矿床的成因研究[J].桂林工学院学报,2009,29(2):161-168. |
| 作者姓名： | 梁金城 刘之葵 李晓峰 陆小平 蒙龙华 李文杰 |
| 作者单位： | 1. 桂林理工大学资源与环境工程系,广西,桂林,541004 2. 桂林理工大学土木工程系,广西,桂林,541004 3. 中国地质科学院,矿产资源研究所,北京,100037 4. 广西地勘局,271地质队,广西,桂林,541000 5. 桂林理工大学资源与环境工程系,广西,桂林,541004;西南科技大学,环境与资源学院,四川,绵阳,621010 |
| 基金项目： | 广西地质专项目，广西自然科学基金，有色及贵金属隐伏矿床勘查教育部工程研究中心资助项目 |
| 摘 要： | 桂北老堡铅锌矿床位于扬子地台前寒武地块前陆盆地边缘的正向构造带上，产于震旦系陡山沱组白云岩和老堡组硅质岩中。矿石矿物成分简单，主要由闪锌矿、方铅矿、黄铁矿及少量黄铜矿等硫化物组成；脉石矿物主要由白云石、方解石、石英及少量绢云母、绿泥石等矿物组成。石英流体包裹体均一温度变化在115～270℃，盐度在（w（NaCl））3．8％～5．8％。流体包裹体的气液相成分显示，成矿流体富含CO2、CH4、C2H6，其中的W（Na^＋）／w（K^＋）、W（CI^-）/W（F^-）较高，且W（Na^＋）〉w（K^＋）〉w（Ca^2＋）〉w（Mg^2＋）。矿体中黄铁矿的δ^34S为12‰～21‰。与闪锌矿共生的石英的δ^18O为16．0‰-18．4‰，其中的流体包裹体δD为-58‰～-61‰。地质和地球化学特征表明，老堡为由热卤水与变质水或建造水混合的MVT型铅锌矿。 |
| 关 键 词： | 铅锌矿床 矿床成因 MVT 老堡 广西 |
Genesis of Laobao Pb-Zn Deposit in North Guangxi |
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| LIANG Jin-cheng,LIU Zhi-kui,LI Xiao-feng,LU Xiao-ping,MENG Long-hua,LI Wen-jie.Genesis of Laobao Pb-Zn Deposit in North Guangxi[J].Journal of Guilin University of Technology,2009,29(2):161-168. | |
| Authors: | LIANG Jin-cheng LIU Zhi-kui LI Xiao-feng LU Xiao-ping MENG Long-hua LI Wen-jie |
| Affiliation: | 1 a.Department of Resources and Environmental Engineering;b.Department of Civil Engineering;Guilin University of Technology;Guilin 541004;China;2.Institute of Mineral Resources;China Academy of Geological Sciences;Beijing 100037;3.Team 271;Guangxi Geological Prospecting Bureau;Guilin 541000;4.College of Mineral Resources and Environment;Southwest University of Science and Technology;Mianyang 621010;China |
| Abstract: | Laobao Pb-Zn deposit is located in the forland basin margin of the Precambrian massif,controlled by lithology and stratiform.The ore mineral is simply composed of sphalerite,galena,pyrite with minor chalcopyrite.The gangue minerals consist of dolomite,cacite,quartz,sericite and chlorite.The homogenous temperatures of fluid inclusion in quartz range from 115 to 270 ℃ with salinity of 3.8%-5.8%.The compositions of fluid inclusion in quartz are rich in CO2,CH4,C2H6 with high w(Na+)/w(K+),w(Cl-)/w(F-)ration and w(Na+)＞w(K+)＞w(Ca2+)＞w(Mg2+).Sulfur isotope of pyrite in ore ranges from 12‰ to 21‰.The oxygen isotope and hydrogen isotope in quartz and fluid inclusions are from 16.0‰ to 18.4‰,from -58‰ to -61‰,respectively.It is suggested that Laobao Pb-Zn deposit has characteristics of MVT type deposit,and its fluids are derived from brine or formation water. |
| Keywords: | MVT Pb-Zn deposit metallogenic MVT Laobao Guangxi |
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