| 混合岩化作用中交代岩和铁矿形成的实验研究 |
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| 引用本文：.1993.Experimental study on the formation of metasomatic rocks and iron deposits in the process of migmatization[J].Mineral Deposits,12(4):358~369 |
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| 基金项目:地质行业基金会资助项目 |
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| 中文摘要:通过黑龙江西麻山、天宝山和河南桐柏山混合岩化交代铁矿床的野外地质工作，并进行了高温高压下系统的模拟实验。实验结果证明了在380～660℃的温度和300×105～700×105Pa的压力下，含K、Na卤化物的弱酸性混合岩化的热液，与太古代的变质岩经历了120个小时的持续交代作用，形成了与这些矿区基本相一致的交代岩和铁矿，揭示了混合岩化作用中形成了交代岩和铁矿的物理化学条件。 |
| 中文关键词:实验研究 混合岩化作用 交代岩和铁矿 物理化学条件 |
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| Experimental study on the formation of metasomatic rocks and iron deposits in the process of migmatization |
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| Abstract:Based On field geological study in Ximashan and Tianbaoshan ore districts of Heilongjiang Province and Tongbaishan ore district of Henan Province, the author made an experimental study on the formation of metasomatic rocks and iron deposits in the process of migmatization. In the experiment, the interaction between weakly acid migmatzed hydrothermal solutions and Archean ferrtiferous metamorphic rocks at the ternperature of 350～650℃ and under the pressure of 300×105～700×105 pa extracted TFe 10.49～174.86 mg/l from these rocks, consequently forming metasomatic rocks and iron ores in a weak oxidation environment. It is shown that iron in wall rocks served as the major iron source for mineralization. These data convincingly demonstrate the existence of the following evolution process: Ximashan, Tianbaoshan and Tongbaishan areas were in a neritic environment in Archean, and iron was first concentrated in such sedimentary rocks as dolomitic marl, which afterwards formed ferriferous diopsidite, amphibolites, gneiss and granulite through regional metamorphism. With the evolution of the crustal tectonic movement, migmatization took place once again, accompanied by metasomatism. This led to the skarnization of wall rocks and, as a result, iron was released from these rocks and re-conentrated to form ore deposits. |
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