| 利用包裹体测温资料估算早子沟金矿成岩成矿压力及ｐＨ、Eh值 |
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| 引用本文： | 陈国忠,张愿宁,梁志录,麻红顺,李鹏兵,王建龙.利用包裹体测温资料估算早子沟金矿成岩成矿压力及ｐＨ、Eh值[J].甘肃地质学报,2014,23(4):23-32. |
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| 作者姓名： | 陈国忠 张愿宁 梁志录 麻红顺 李鹏兵 王建龙 |
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| 作者单位： | 甘肃省地矿局第三地勘院; |
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| 基金项目： | 全国危机矿山接替资源勘查项目(201201024061)资助 |
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| 摘 要： | 早子沟金矿位于秦岭造山带西段夏河—合作断裂带上,矿区成矿作用与岩浆热液及断裂构造关系密切,矿区岩浆岩内石英中含有大量熔体包裹体及流体包裹体,显微测温结果显示,熔体包裹体均一温度范围为700℃-790℃,流体包裹体分为H2O-NaCl包裹体、NaCl-H2O-CO2包裹体、H2O-CO2包裹体3种类型,包裹体均一温度范围为195℃-360℃,本文通过对熔体包裹体的研究,采用“熔体包裹体＋流体包裹体”的方法 ,估算矿区岩浆岩成岩压力为275MPa,依据断裂带流体垂直分带规律,计算得到早子沟金矿成岩深度为13.96km,成矿深度为2.10-6.02km,平均成矿深度为4.06km。表明矿区深部成矿找矿尚有很大潜力。应用刘斌及Ryzhenko and Bryzgalin推导的计算流体包裹体pH值及Eh值的公式,对矿区不同体系（类型）流体包裹体的pH值及Eh值进行了估算,其结果表明：早子沟金矿包裹体的pH值为2.25-5.88,成矿溶液为酸性,在成矿阶段pH呈升高的趋势;包裹体的Eh值为0.409-0.139V,成矿溶液体系从早期到晚期Eh呈逐渐降低的趋势。pH值及Eh值的这种变化趋势,均有利于矿区Au元素的沉淀富集。
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| 关 键 词： | 熔体包裹体 流体包裹体 成岩压力 成矿深度 pH值 Eh值 早子沟金矿 |
INFERRING DIAGENETIC AND METALLOGENIC PRESSURE,Ph AND Eh VALUE BASED ON TEMPERATURE DATA OF INCLUSION SAMPLES |
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| CHEN Guo-zhong,ZHANG Yuan-ning,LIANG Zhi-lu,MA Hong-shun,LI Peng-bing,WANG Jian-long.INFERRING DIAGENETIC AND METALLOGENIC PRESSURE,Ph AND Eh VALUE BASED ON TEMPERATURE DATA OF INCLUSION SAMPLES[J].Acta Geologica Gansu,2014,23(4):23-32. |
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| Authors: | CHEN Guo-zhong ZHANG Yuan-ning LIANG Zhi-lu MA Hong-shun LI Peng-bing WANG Jian-long |
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| Institution: | (No.3 Geology and Mineral Exploration Team, Gansu Provincial Bureau of Geology and Mineral Resources Exploration and Development, Lanzhou 730050, China) |
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| Abstract: | Zaozigou gold deposits is located in the western part of the Qinling orogenic belt. The results showed that temperature, melt homogenization temperature range of 700℃-790℃, fluid inclusions into H2O-NaCl inclusions, NaCl-H2O-CO2 inclusions, H2O-CO2 inclusions are three types of homogenization temperature range of 195℃- 360℃, this paper studies the melt inclusions, using the method ＂melt inclusions ＋ fluid inclusions＂ , the estimate magmatic rocks diagenetic pressure 275Mpa, based fault fluid vertical zonation, calculated get Zaozigou gold deposits diagenetic depth 13.96km, mineralization depth of 2.10-6.02km, the average depth of mineralization 4.06km. Deep mine ore mineralization indicates there is potential. Fluid inclusions formula Ph value and Eh value applications and Liu bing and Bryzgalin Bin derivation of the Ph value and Eh values of different mining systems （types） of fluid inclusions were estimated, and the results showed that： Zaozigou gold deposits parcel Ph value of 2.25 to 5.88 body mineralizing solution is acidic, increasing trend was in the mineralization stage Ph; Eh inclusions is 0.409-0.139V, mineralization solution system from early to late Eh was gradually reduced trend this trend Ph value and Eh values are conducive to the enrichment precipitate Au mine. |
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| Keywords: | melt inclusions fluid inclusions diagenetic pressure mineralization depth Ph value Eh value Zaozigou gold deposits |
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