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矿床地质  2006 

金铜在气相中的迁移实验及矿石的成因

Keywords: 地球化学,含金属流体,气体内迁移金属,相分离实验,矿石成因,亚临界区

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Abstract:

文章报道了金属在高温高压气相的迁移实验研究,并阐明气相中迁移金属的成矿作用。实验是使含金属的流体在高温、高压的超临界态条件下通过相分离装置,在减低温度压力下实现气液相分离过程,收集气液相分离物,研究金属在气、液两相里的再分配。含金属(如金、铜)的NaHCO3-HCl-H2O流体在250~300℃的相分离过程实验结果表明:金属可以分布到气相里。根据金铜流体的实验结果,结合矿床调查,推测金属可以在地球深部以气体形式迁移。含金属的CO2-HCl-NaCl流体(气相)可以携带金属(金、铜),从岩石圈深部运输到地壳,甚至地表。金铜矿床矿石的形成过程中气体迁移金属起着重要作用。

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[51]  本次实验中还有一些要继续解决的问题,输出的气相和液相里的金的浓度与输入流体的原始金浓度相比,稍低.其原因是;在有些温度下,少数不锈钢的接口部件上易于有金的吸附和沉淀.因此,在各个温度条件下的气相和液相里,金的总浓度并不完全一样.

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