Some typical partition and distributition patterns of platinum group elements (PGEs) are noticed by the authors in the study on geochemical indicator system of PGEs. They can be taken as useful tools in solving diagenetic and metallogenic as well as other more extended geochemical problems.

A silicalite bed was found in the hanging wall and foot wall of the sulfide-rich bed of the Lower Cambrian black rock series in Sourh China. Its origin was not described before. On the oxide (SiO2-Al2O3, SiO2-MgO, SiO2-K2O+Na2O) diagrams for discriminating silicalites of chemical, biological and volcanic origins (Liu Xiufeng, 1991), most of the data points of silicalites fall within the areas representing silicalites of chemical and volcanic origins. On the Al-Fe-Mn diagram for discriminating silicalites of hydrorhermal and biological origins (Yamamoto, 1987), the data points fall within the areas represenring silicalires of hydrothermal and hydrothermal-biological origins. On the SiO2-Al2O3 diagram for discriminating silicalites of hydrorhermal and hydrogenous origins (Bonatti, 1975), the dara points mostly fall within the hydrothermal area. The ratios of SiO/Al2O3, SiO2/(K2O+Na2O), SiO2/MgO, and K2O/Na2O in the silicalites stand between those of volcanic sediments and of seafloor hydrothermal sediments. The total amount of rare-earth elements in the silicalites is low; the North American Shale-normalized REE patterns decline leftward with obvious negative Ce anomaly. The trace elements Mo, Zn, As, Sb, Se, U, and Ba are higher than those in non-hydrothermal sediments and U/Th≥ 1. The present authors think that the silicalites are derived from seafloor hot brines which had artracted elements from igneous rocks.

In the Lower Cambrian black shales of south China developed a metal-rich bed with large amounts of Au, Ag and platinum group elements (NME) and many other metals such as Ni, Mo, As, Ba and Se. The concentrations of NME are much higher in Zunyi of Guizhou province (PGE+Au, 1138×10-9; Ag, 91775×10-9) than that in Zhangjiajie of Hunan province (PGE+Au, 605×10-9; Ag, 18 534×10-9). The Romean data are of 2.550 and 2.393 for the metal-rich bed and black shale in Zhangjiajie and the equivalent data are of 3.054 and 3.272 in Zunyi. The δ13C (PDB, %o) values are of-31.008～-31.181 (±0.2) for kerogen from Zhangjiajie and -31.723～-33.854 (±0.2) from Zunyi. Correspondently, the Proterozoic and Cambrian ultramafic magmatism in Guizhou province is much more developed than that in Hunan province. This might be of significance to indicate that the NME in the black shales were originally from ultramafic magma or the igneous rocks.

黄铁矿在云南墨江金厂金矿床中广泛出现于蛇纹岩、黄铁铬绢英岩、硅质岩和石英脉中。通过对与黄铁矿成因产状密切关联的热液演化阶段的划分、黄铁矿的晶形统计、黄铁矿的热电性研究、黄铁矿的电子探针分析、黄铁矿所赋存的含金岩矿石标本中金品位化学分析，确定了与成矿物质来源金厂蛇纹岩化镁质超基性岩、硅质岩和可能隐伏的酸性侵入岩有关的系列成因标型。在对黄铁矿热电标型的均方差参数的自然对数值（lnMp）与金品位自然对数值（lnTg）的相关性研究基础上，提出当lnMp值接近4.1时，金的品位值接近工业开采标准。金厂金矿体与镍矿体尽管空间上分离，但近镍矿体与富金石英脉中黄铁矿的共生元素组成成分表明金、镍矿体中部分矿质具有同源同期的特征。此外，金厂组硅质岩和可能的隐伏岩体在成矿物源和热源方面的贡献不容忽视。

本文用ICP-MS首次测定了呷村银多金属黑矿型矿床矿石流体包裹体中的稀土元素含量。研究表明，主成矿期流体稀土元素配分模式均为轻稀土富集，Eu具明显正异常。通过初步对比，本区主成矿期流体与东太平洋脊、大西洋脊等现代高温酸性地热系统热液具有相似的稀土模式，反映了它们物化条件的相似性；但前者∑REE高于后者，且两者Eu/Eu*值不同。经过分析，本区成矿流体Eu正异常主要为T、pH、fo2控制，另外，围岩性质和水2岩主反应带压力也可能影响了REE含量及Eu异常的不同。至于（La/Yb）cn>1，可能是由于矿物或微粒表面的吸附作用所致。