Abstract

A palladium and lead intermetallide, namely, zvyagintsevite, is a relatively widespread mineral of magmatic sulfide ores in Norilsk deposits and ores in the Bushveld, Konder, and Yoko-Dovyren intrusions. It is a relatively high-temperature pneumatolytic mineral and a member of the continuous solid solution range: rustenburgite Pt₃Sn–atokite Pd₃Sn–zvyagintsevite Pd₃Pb. In general, zvyagintsevite contains up to 13 wt % Pt, 11 wt % Sn, 5–8 wt % Au, and an appreciable amount of Bi, Hg, Te, Sb, and Ge. Its composition corresponds to (Pd,Pt,Au)₃(Pb,Sn,Bi,Sb,Hg,Ge)₁. А different zvyagintsevite type was investigated in metamorphosed magnetite–pentlandite–putoranite ores of deep horizons in the northern flank of the Oktyabrskoye deposit within the Norilsk ore field. Almost pure zvyagintsevite Pd₃Pb developed in small nests and miniveins of low-temperature metamorphic–hydrothermal hibbingite (Fe²⁺,Mn²⁺)₂Cl(OH)₃ and siderite. Zvyagintsevite and hibbingite have induction boundaries of joint growth. Metamorphogenic–hydrothermal zvyagintsevite accretions reach up to 35 × 15 μm in size. Its composition is stable and close to stoichiometric, wt % (n = 7): 60.24 (59.14–61.13) Pd, 38.75 (38.04–39.37) Pb, and 0 Cd (more often, 0.43); its formula is Pd_{3.001(2.991–3.011)}Pb_{0.993(0.977–1.009)}Cd_{0.006(0–0.021)}. Metamorphic–hydrothermal zvyagintsevite differs from the pneumatolytic one in the mineral assemblages and composition, specifically, in the absence of Pt, Sn, Au, Bi, Te, Sb, Hg, and Ge impurities. Metamorphic–hydrothermal zvyagintsevite was likely formed in the Norilsk ores under zeolite facies conditions with an extremely low sulfide sulfur fugacity in the stability field of native lead (log f S₂ < –25 at 250°C).

中文翻译：

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Zvyagintsevite Pd3Pb 的一种新的变质热液遗传类型

摘要

钯和铅的金属间化物，即 zvyagintsevite，是一种相对广泛的矿物，由 Norilsk 矿床中的岩浆硫化物矿石和 Bushveld、Konder 和 Yoko-Dovyren 侵入岩中的矿石组成。它是一种相对高温的气溶矿物，是连续固溶体范围的成员：铁锈石 Pt ₃ Sn-atokite Pd ₃ Sn-zvyagintsevite Pd ₃ Pb。通常，zvyagintsevite 含有高达 13 wt% 的 Pt、11 wt% 的 Sn、5-8 wt% 的 Au，以及相当数量的 Bi、Hg、Te、Sb 和 Ge。其成分对应于 (Pd,Pt,Au) ₃ (Pb,Sn,Bi,Sb,Hg,Ge) ₁. 在诺里尔斯克矿场内 Oktyabrskoye 矿床北侧的深地层变质磁铁矿 - 戊兰铁矿 - 普托朗石矿石中研究了不同的 zvyagintsevite 类型。几乎纯的 zvyagintsevite Pd ₃ Pb 在低温变质-热液氢辉石 (Fe ²⁺ ,Mn ²⁺ ) ₂ Cl(OH) ₃和菱铁矿的小巢和细脉中发育。Zvyagintsevite和hibbingite具有联合生长的诱导边界。变质-热液 zvyagintsevite 吸积物的尺寸可达 35 × 15 μm。其成分稳定且接近化学计量，wt % ( n = 7)：60.24 (59.14–61.13) Pd、38.75 (38.04–39.37) Pb 和 0 Cd（更常见的是 0.43）；它的公式是 Pd_{3.001(2.991–3.011)} Pb _{0.993(0.977–1.009)} Cd _{0.006(0–0.021)} . 变质-热液 zvyagintsevite 在矿物组合和组成方面与气解的不同，特别是在没有 Pt、Sn、Au、Bi、Te、Sb、Hg 和 Ge 杂质的情况下。变质热液 zvyagintsevite 可能是在沸石相条件下在诺里尔斯克矿石中形成的，在天然铅的稳定性场中具有极低的硫化物硫逸度（log  f  S ₂ < –25 在 250°C 下）。