| 辽东地区后仙峪及翁泉沟硼矿床流体包裹体特征研究 |
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| 引用本文： | 李雪梅,孙丰月,李碧乐,王力.辽东地区后仙峪及翁泉沟硼矿床流体包裹体特征研究[J].现代地质,2007,21(4):645-653. |
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| 作者姓名： | 李雪梅 孙丰月 李碧乐 王力 |
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| 作者单位： | 1吉林大学 地球科学学院，吉林 长春130061； 2吉林大学 应用技术学院，吉林 长春130022 |
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| 基金项目： | 中国地质调查局地质调查项目 |
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| 摘 要： | 对后仙峪硼矿区热水喷流沉积成因的电英岩中石英及翁泉沟硼矿区后生热液成因的石英脉中的原生流体包裹体进行了对比研究。结果表明：后仙峪电英岩石英中只发育气液两相包裹体，测温结果显示流体包裹体均一温度为146~249 ℃，盐度为15.9%~18.4%，密度为0.96~1.04 g/cm3，计算出成矿压力为43.95~68.43 MPa，由此估算出热水喷流沉积时的古海水深度为4.40~6.84 km；包裹体成分分析结果显示气相成分以H2O、CH4为主，含CO2和N2及少量的H2S和H2。翁泉沟石英脉中则发育气液两相包裹体及含CO2三相包裹体两种类型，测温结果显示流体包裹体均一温度为142~377 ℃，盐度为12.7%~14.5%，密度为0.96~1.01 g/cm3，计算出压力为43.48~65.86 MPa，推算出后生成因石英脉的形成深度为5.23~6.55 km；包裹体成分分析结果显示气相成分以H2O、CO2为主，含CO、N2和H2，并含少量的CH4、H2S和微量的C2H6。矿床地质特征与硼同位素特征显示这两个矿床均为热水喷流沉积矿床，并经历了区域变质作用改造及后期热液交代蚀变作用。流体包裹体特征表明，热水喷流沉积成矿作用发生在相对还原的海底条件；而后期叠加的热液活动发生在相对氧化的环境下。
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| 关 键 词： | 硼矿床 流体包裹体 后仙峪 翁泉沟 辽东地区 |
| 文章编号： | 1000-8527（2007）04-0645-09 |
| 收稿时间： | 2006-12-12 |
| 修稿时间： | 2007-05-06 |
Study on the Fluid Inclusions from Houxianyu and Wengquangou Borate Deposits in Eastern Liaoning Province |
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| LI Xue-mei,SUN Feng-yue,LI Bi-le,WANG Li.Study on the Fluid Inclusions from Houxianyu and Wengquangou Borate Deposits in Eastern Liaoning Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2007,21(4):645-653. |
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| Authors: | LI Xue-mei SUN Feng-yue LI Bi-le WANG Li |
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| Institution: | 1College of Earth Sciences, Jilin University, Changchun,Jilin130061, China;
2College of Applied Technic, Jilin University, Changchun,Jilin130022, China |
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| Abstract: | Studies on the primary fluid inclusions in quartz of tourmalite from exhalative sedimentary process in Houxianyu borate deposit and in quartz vein from epigenetic hydrothermal activity in Wengquangou borate deposit in eastern Liaoning Province were carried out.The results indicate that there are only two-phase primary aqueous inclusions in quartz of tourmalite from Houxianyu borate deposit.Micro-thermometric studies show that the data of homogenous temperature range from 146 ℃ to 249 ℃,with salinity from 15.9% to 18.4%(NaCl equivalent),and density from 0.96 g/cm3 to 1.04 g/cm3.The ore-forming pressures obtained from the fluid inclusion study range from 43.95 MPa to 68.43 MPa.The depths of sea water range from 4.40 km to 6.84 km based on the pressures when exhalative sedimentary process occurred.The results on the basis of gas component analysis show that the ore-forming fluids are mainly composed of H2O and CH4,with a certain amounts of CO2,N2 and minor amounts of H2S and H2.The fluid inclusions in quartz vein from Wengquangou borate deposit can be classified into two-phase aqueous type and CO2-bearing three-phase type.Micro-thermometric studies indicate that the data of homogenous temperature,salinity and density vary from 142 ℃ to 377 ℃,12.7% to 14.5%(NaCl equivalent),and 0.96 g/cm3 to 1.01 g/cm3,respectively.The ore-forming pressures range from 43.48 MPa to 65.86 MPa.The forming depths of epigenetic quartz vein range from 5.23 km to 6.55 km.The results on the basis of gas component analysis show that the fluids are mainly composed of H2O and CO2,with a certain amounts of CO,N2,H2,minor amounts of CH4 and H2S and trace amounts of C2H6.The geological characteristics of the two deposits and their boron isotopic compositions show that both deposits are exhalative sedimentary deposits,and undergone regional metamorphic reconstruction and hydrothermal alteration.The characteristics of fluid inclusions show that exhalative sedimentary process occurred in relatively deoxidized ocean floor environment,while epigenetic hydrothermal activity occurred in relatively oxidative one. |
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| Keywords: | borate deposit fluid inclusion Houxianyu Wengquangou eastern Liaoning Province |
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