Abstract—

One of the pivoting problems in the genesis of magmatic deposits is the role of silicate melt in the origin of sulfide ores. A way of solving this problem is to compare massifs with different mineralization, using contents of major and trace elements in the rocks. However, intrusions of the Norilsk intrusive complex are rarely compared with one another in terms of ore composition and volume in them. This paper is the first geochemical data, all of which were acquired with the application of modern analytical techniques, on the Chernogorsky intrusion in the Norilsk trough. The structure and composition of this intrusion are well comparable to the intrusions of the same complex hosting the uniquely large deposits: Talnakh, Kharaelakh, and Norilsk 1. The weighted mean composition of the Chernogorsky intrusion (wt %) is as follows: 47.2 SiO₂, 0.62 TiO₂, 16.7 Al₂O₃, 9.94 FeO, 0.16 MnO, 11.7 MgO, 11.3 CaO, 1.53 Na₂O, 0.46 K₂O, 0.07 P₂O₅, and 0.18 Cr₂O_3,, and the ratios of trace elements (La/Sm)_n = 1–2, (Gd/Yb)_n = 1.2–1.4, and (Th/Nb)_n = 1–4 are same as typical of other rocks of the Norilsk complex. The ores of the Chernogorsky intrusion are close to the ores of Norilsk 1, their Cu/Ni ratio slightly exceeds 1, and the Pt + Pd = 5–6 ppm on average. However, the predicted resources of metals in this massif (0.8 Mt Cu + Ni and 0.5 kt Pt + Pd) are 140 times lower than the resources of the Kharaelakh intrusion (113 Mt Cu + Ni, 17.5 kt Pt + Pd), and 50 times lower than in Talnakh (40 Mt Cu + Ni, 8.3 kt Pt + Pd). This confirms that the ore content in an intrusion does not depend on the composition of its silicate rocks, and hence, the compositions of these rocks cannot be used as an exploration guide for new deposits.

中文翻译：

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诺里尔斯克地区含矿切尔诺戈尔斯基侵入体的矿物地球化学特征

摘要-

岩浆矿床成因的关键问题之一是硅酸盐熔体在硫化矿成因中的作用。解决这个问题的一个方法是比较不同矿化的地块，利用岩石中的主要和微量元素的含量。然而，就矿石成分和体积而言，很少将诺里尔斯克侵入岩体的侵入体进行比较。本文是应用现代分析技术获得诺里尔斯克海槽切尔诺戈尔斯基侵入体的第一批地球化学数据。该侵入体的结构和成分与拥有独特大型矿床的同一复合体的侵入体具有很好的可比性：Talnakh、Kharaelakh 和 Norilsk 1. Chernogorsky 侵入体的加权平均成分（重量百分比）如下：47.2 SiO₂，0.62的TiO ₂，16.7的Al ₂ ö ₃，9.94的FeO，0.16的MnO，11.7的MgO，11.3的CaO，1.53的Na ₂ O，0.46ķ ₂ O，0.07 P ₂ ø ₅，和0.18的Cr ₂ ö _3，和微量元素的比率 (La/Sm) _n = 1–2、(Gd/Yb) _n = 1.2–1.4 和 (Th/Nb) _n= 1-4 与诺里尔斯克复合体的其他岩石的典型值相同。Chernogorsky 侵入体的矿石与诺里尔斯克 1 号的矿石接近，其 Cu/Ni 比略超过 1，平均 Pt + Pd = 5-6 ppm。然而，该地块中金属的预测资源量（0.8 Mt Cu + Ni 和 0.5 kt Pt + Pd）比 Kharaelakh 侵入体的资源量（113 Mt Cu + Ni，17.5 kt Pt + Pd）低 140 倍，而 50比 Talnakh (40 Mt Cu + Ni, 8.3 kt Pt + Pd) 低几倍。这证实了侵入体中的矿石含量不取决于其硅酸盐岩石的成分，因此，这些岩石的成分不能用作新矿床的勘探指南。