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干酪根是沉积岩中最主要的有机质。在数量上干酪根占沉积有机质总量的90%以上,对于古老的黑色页岩这个数值可能更高一些。因此,干酪根中金属元素的结合状态基本上反映了沉积岩中金属元素的有机结合状态。本文采用干酪根纯化、质子探针和中子活化的分析方法,研究了湖北兴山白果园黑色页岩型银钒矿床中金属元素的有机/无机结合状态。同全岩相比,干酪根中金属元素的富集具有如下特征:①Au是在干酪根中富集系数最大的元素,比原岩富集了16~18倍.富集系数>10的还有Ta,Se和Hg,表明黑色页岩中的干酪根有强烈富集Au、Ta、Se、Hg的能力。②Ga、Ag、Zn、As、Cu、Sb趋向于在干酪根中富集,而且具有比较相近的富集系数(3.86~2.12),这与它们在黑色页岩中常常共生是吻合的,这些元素的富集与有机质有关。③Fe的富集系数<1,趋向于以无机形式存在,Mn、Cr与Fe比较类似。④V的富集系数<1,趋向于在无机矿物中富集,这与V置换伊利石中Al~(3+)和重晶石中的Ba~(2+)是一致的。⑤Hf有强烈的在有机质中聚集的趋势(富集系数平均
Kerogen is the most important organic matter in sedimentary rocks. In number, kerogen accounts for more than 90% of the total sedimentary organic matter, which may be higher for ancient black shale. Therefore, the binding state of metal elements in kerogen basically reflects the organic bonding state of metal elements in sedimentary rocks. In this paper, the kerogen, proton probe and neutron activation analysis methods were used to study the organic / inorganic combination of metal elements in the black shale-type silver-vanadium deposit in Baixuan, Xingshan, Hubei Province. Compared with the whole rock, kerogen metal elements enrichment has the following characteristics: ① Au is the kerogen enrichment coefficient of the largest element, 16-16 times than the original rock enrichment enrichment coefficient> 10 also Ta, Se and Hg, indicating that the kerogen in black shale strongly enriches Au, Ta, Se and Hg. ②Ga, Ag, Zn, As, Cu and Sb tend to be enriched in kerogen and have similar enrichment coefficients (3.86-2.12), which are consistent with their frequent symbiosis in black shale. These elements The enrichment and organic matter. ③ enrichment coefficient of Fe <1, tend to exist in inorganic form, Mn, Cr and Fe are more similar. ④ The enrichment coefficient of V <1, which tends to be enriched in inorganic minerals. This is in agreement with the substitution of V ~ 3 + in barite and Ba ~ (2+) in barite. ⑤Hf has a strong tendency to aggregate in organic matter (enrichment coefficient average