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现代地质 ›› 2004, Vol. 18 ›› Issue (4): 529-536.

• 岩石与矿床地质 • 上一篇    下一篇

鲁西平邑地区磨坊沟金矿床的流体包裹体研究

胡华斌1,2,毛景文1,3,牛树银2,李蒙文3,刘 涛4,刘 铭4   

  1. 1.中国地质大学地球科学与资源学院,北京 100083;
    2.石家庄经济学院资源学院,河北 石家庄 050031;
    3.中国地质科学院矿产资源研究所,北京 100037;
    4.山东省第二地质矿产勘查院,山东兖州 272100
  • 收稿日期:2003-12-25 修回日期:2004-09-06 出版日期:2004-04-20 发布日期:2004-04-20
  • 作者简介:胡华斌,男,博士研究生,1966年出生,矿物学、岩石学、矿床学专业,主要从事矿床学方面的研究工作。
  • 基金资助:

    国家重点基础规划发展项目(G1999043211);国家自然科学基金项目(40272088);中国地质调查局地质调查项目(200110200038)。

STUDY ON FLUID INCLUSIONS OF MOFANGGOU GOLD DEPOSITS IN PINGYI, WESTERN SHANGDONG

HU Hua-bin1,2, MAO Jing-wen1,3, NIU Shu-yin2, LI Meng-wen3, LIU Tao4, LIU Ming4   

  1. 1.China University of Geoscience, Beijing  100083, China
    2.Shijiazhuang University of Economics, Shijiazhuang, Hebei   050031, China
    3.Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing  100037, China
    4.No.2 Geology and Mineral Resources Exploration Institute of Shandong, Yanzhou, Shandong  272100, China
  • Received:2003-12-25 Revised:2004-09-06 Online:2004-04-20 Published:2004-04-20

摘要:

选择鲁西平邑磨坊沟和梨方沟两个矿区的矿化蚀变样品,对保存于石英、方解石和萤石中的原生包裹体及氢、氧稳定同位素进行了详细的研究。研究表明,二个矿区的包裹体大小、形态相似,类型一致,均为气液两相盐水包裹体。包裹体的均一温度变化范围较宽,在120~450℃之间均有分布,但主要集中于120~260℃的范围内,可进一步分为110~150℃和170~250℃两个区间。结合显微镜下观测的载金矿物的特点,推测金矿的形成温度区间在170~250℃之间。冰点变化范围较大,在-2.8~-11.5℃之间,对应的盐度在4.65%~15.47%之间。矿体及围岩黄铁矿的δ34S值介于-0.71‰~+2.99‰之间,方解石和石英的δDSMOW
值为-63‰~-70‰,δ18DSMOW值为+18.4‰~+22.2‰。以上数据表明流体来源于地幔,成矿过程中与建造水发生了混合。

关键词: 流体包裹体, 低温热液, 成矿作用, 平邑, 鲁西

Abstract:

This paper studies in detail the characteristics of primary fluid inclusions and H, O isotope, which hosted in quartz, calcite and fluorite from alteration samples of Mofanggou and Lifanggou ore districts in Pingyi, western Shangdong. Research indicates that all inclusions, with similar size, shape and types, contain NaCl-H2O solution of vapor and liquid two phases. The temperature of homogenization of the fluid inclusions ranges from 120 to 450℃, and dominates by 120 to 260℃, with a bimodal distribution from 110 to 150℃ and 170 to 250℃. Temperature of gold mineralization ranges from 170 to 250℃. Ice-melting temperature varies from -2.8℃ to -11.5℃,corresponding to a range of salinities from 4.65% to 15.47% NaCl equivalent. δ34S values of pyrites in oredodies and wall rocks range from salinities from -0.71‰ to +2.99‰. δDSMOW and δ18DSMOW value in calcite and quartz vary from -63‰ to -70‰ and +18.4‰ to + 22.2‰, respectively. These data suggest that fluids originated from mantle and mixed with formation water during later mineralization.

Key words: fluid inclusion, epithermal mineralization, Pingyi, western Shandong

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