金在花岗质熔体中溶解度的初步实验研究
A Preliminary Experimental Study on the Solubility of Gold in Granitic Silicate Melts
查看参考文献27篇
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文摘
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以合成花岗岩、水、不同浓度的盐酸溶液、氢氟酸溶液作为反应初始物,在850℃,100 MPa,接近于NNO的条件下开展了金在不同花岗质熔体中溶解度的实验研究,实验固液相产物中的金含量使用石墨炉原子吸收法测定。实验结果显示,金在花岗质熔体中的溶解度变化范围为1.87~156.62μg/g,流体相中金的溶解度为0.31~6.92μg/g;金在熔体相中的溶解度较其在共存液相中的高。花岗质熔体相中金的溶解度明显受熔体化学组成的影响,过碱性富钠花岗质熔体中金的溶解度明显高些;金在花岗质熔体中的溶解度随着熔体中Na_2O/K_2O摩尔比增大而增大;在氟氯共存岩浆体系中,氟含量变化对金在熔体相中的溶解度影响不明显,而液相中氯含量增大有利于提高金在流体相中的含量。 |
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其他语种文摘
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Haplogranitic gels and distilled water,hydrochloric acid solutions and hydrofluoric acid solution were employed as starting solid materials and fluid in this experimental study.The temperature and pressure were 850 ℃,100 MPa,respectively,and the fugacity was near NNO.Gold content in silicate melt and aqueous fluid were measured with a flame atomic-absorption spectrometer(AAS).Results show that the solubility of gold in different melts is ranged from 1.87×10-6 to 156.62×10-6 and gold contents in aqueous fluid are vary from 0.31×10-6 to 6.92×10-6.Gold content in silicate melt phase is higher than that in the coexisting aqueous fluid.Solubility of gold is affected by composition of the melt,and gold solubility in Na-rich peralkaline silicate melts is obviously higher and increases with increasing Na_2O/K_2O mole ratio.Fluorine has no obviously influence on gold solubility in melt phase,but increasing chlorine content can improve gold concentration in aqueous fluid phase,in fluorine and chlorine coexisting magma system. |
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来源
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矿物学报
,2012,32(1):22-27 【核心库】
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关键词
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金
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花岗质熔体
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溶解度
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实验研究
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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贵州省有色金属和核工业地质勘查局, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金
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贵州省项目
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文献收藏号
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CSCD:4467068
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