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“Invisible” Gold in Pyrite and Arsenopyrite from The Pavlik Deposit (Northeastern Russia)
Doklady Earth Sciences ( IF 0.9 ) Pub Date : 2020-11-01 , DOI: 10.1134/s1028334x20110136
N. V. Sidorova , V. V. Aristov , A. V. Grigor’eva , A. A. Sidorov

The first study on the distribution pattern and features of the “invisible” gold concentration in pyrite and arsenopyrite was carried out for a typical gold–quartz deposit of the Kolyma region. It was established that the main concentrator of “invisible” gold on the Pavlik deposit is the Late Arsenian pyrite-2. The method of Laser Ablation-Inductivity Coupled Plasma-Mass Spectrometer (LA-ICP-MS) gives an Au content up to 478 g/t; the Electron Microprobe Analysis (EMPA) gives up to 570 g/t by. The As content, determined by LA-ICP-MS is up to 4.1 wt % and up to 3.4 wt % by EMPA. Pyrite-2 overgrows and replaces the early pyrite-1 with a reduced content of As and Au. Microinclusions of the Pb–Zn–Cu–Sb–Ag–Bi–containing phases are concentrated at the boundaries of the pyrite-1 and pyrite-2 blocks. Pyrite-2 is depleted by an order in Cu, Zn, Ag, Sb, Pb, and Bi in comparison with pyrite-1. The max Au/As molar ratio in pyrite-2 is 0.006, which suggests the presence of Au in the form of a solid solution. In another case, pyrite, depleted by trace elements, is cemented with As, Ag, Sb, Au, and Pb-rich marcasite with native gold. In arsenopyrite, there is a homogeneous distribution of gold at low concentrations (up to 3 g/t) in euhedral crystals and a heterogeneous distribution (up to 7 g/t) in deformed fissured grains.

中文翻译:

来自 Pavlik 矿床(俄罗斯东北部)的黄铁矿和毒砂中的“隐形”金

首次研究了黄铁矿和毒砂中“隐形”金浓度的分布格局和特征,研究对象是科雷马地区典型的金-石英矿床。已确定 Pavlik 矿床中“隐形”金的主要集中区是晚砷黄铁矿 2。激光烧蚀-电感耦合等离子体质谱仪 (LA-ICP-MS) 的方法得出的金含量高达 478 g/t;电子微探针分析 (EMPA) 给出高达 570 克/吨。由 LA-ICP-MS 测定的 As 含量高达 4.1 wt%,通过 EMPA 测定高达 3.4 wt%。Pyrite-2 过度生长并以降低的 As 和 Au 含量取代早期的 pyrite-1。含 Pb-Zn-Cu-Sb-Ag-Bi 相的微夹杂物集中在 pyrite-1 和 pyrite-2 块的边界处。Pyrite-2 以 Cu、Zn、Ag、Sb、Pb 的顺序耗尽,和 Bi 与黄铁矿-1 相比。黄铁矿-2 中的最大 Au/As 摩尔比为 0.006,这表明 Au 以固溶体的形式存在。在另一种情况下,被微量元素耗尽的黄铁矿与富含 As、Ag、Sb、Au 和 Pb 的白铁矿与原生金胶结在一起。在毒砂中,低浓度(高达 3 g/t)的金在自形晶体中分布均匀,在变形的裂隙晶粒中分布不均匀(高达 7 g/t)。
更新日期:2020-11-01
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