贵州遵义黑色岩系多金属层中铂族元素的赋存状态
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摘要
本文运用逐级化学提取和重液分离,结合电感耦合等离子体质谱分析,研究了遵义地区黑色岩系多金属层中铂族元素的赋存状态及其沉淀富集规律。实验结果表明,铂族元素主要赋存于硫化物类矿物中,其中Pt和Pd的赋存形式有所不同,有一部分Pt还存在于粘土矿物中,Pd则除部分在粘土矿物中外,还可能有独立矿物存在。结合前人的研究,可以认为成矿溶液中铂族元素可呈不同形式的络合物迁移;粘土矿物、有机质及金属硫化物在PGE富集过程中起着地球化学障的作用。
This paper studied the occurrence of platinum group elements(PGE) in the polymetallic layer of black shales,Zunyi,Guizhou using sequential chemical extraction(SCE),heavy liquid separation and inductively coupled plasma mass spectrometry(ICP-MS),and discussed the evolution of PGE in black shales.The results of SCE indicated that PGE mainly concentrates in sulfide minerals.The occurrences of Pt and Pd in the layer are different: a part of Pt is adsorbed in clay minerals while Pd is likely to form independent minerals in addition to adsorption portion in clay minerals.Combined with previous research results,we proposed that PGE transported in the hydrothermal fluid as different complexes,such as chlorine,bisulfide and ammonia complexes.The clay minerals,organic matter and sulfide served as geochemical barriers in the mineralization of PGE.
This paper studied the occurrence of platinum group elements(PGE) in the polymetallic layer of black shales,Zunyi,Guizhou using sequential chemical extraction(SCE),heavy liquid separation and inductively coupled plasma mass spectrometry(ICP-MS),and discussed the evolution of PGE in black shales.The results of SCE indicated that PGE mainly concentrates in sulfide minerals.The occurrences of Pt and Pd in the layer are different: a part of Pt is adsorbed in clay minerals while Pd is likely to form independent minerals in addition to adsorption portion in clay minerals.Combined with previous research results,we proposed that PGE transported in the hydrothermal fluid as different complexes,such as chlorine,bisulfide and ammonia complexes.The clay minerals,organic matter and sulfide served as geochemical barriers in the mineralization of PGE.
引文
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