Abstract—

A mechanism is suggested to explain the transport of sulfide material by means of its dissolution and subsequent redeposition under the effect of an ascending infiltrating flow of intercumulus melt during the compaction of cumulates in layered plutons. Evidences of this process are observable in the Burakovo–Aganozero intrusion. Analysis of data on Cu concentrations in rocks of the pluton (more than 10 000 samples of core material from 160 boreholes) reveals two distribution types of the low-sulfide mineralization. The vertical sections of the first type are characterized by mineralization distributed throughout the whole thickness of the lower unit of clinopyroxene–orthopyroxene (Cpx–Opx) cumulates and the almost absolute absence of sulfides in all overlying rocks. In the second type, Cu mineralization is constrained to the top part of this unit of clinopyroxene–orthopyroxene (Cpx–Opx) cumulates, and the overlying rock sequence of the zone of clinopyroxene–orthopyroxene–plagioclase (Cpx–Opx–Pl) cumulates includes intensely mineralized rocks. Physicochemical analysis within the scope of D.S. Korzhinskii’s theory of acid–basic interaction and numerical simulations of the effects of major components of the melt on the solubility of the sulfide phase indicate that Ca and Mg play an important role in the liquid immiscibility/dissolution of the sulfides. A model is proposed for the origin of the low-sulfide mineralization of this pluton: clinopyroxene emergence on the liquidus resulted in the onset of liquid immiscibility of sulfide and produced Cu distribution of the first type. The infiltration of the intercumulus melt during the compaction of the cumulus material led to the dissolution and upward transport of the sulfide material for hundreds of meters and thus produced Cu distribution of the second type.

中文翻译：

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积液渗入作为硫化物迁移的一个过程-以布拉科夫-阿加诺零星侵入岩的低硫化物矿化为例

摘要-

提出了一种机制来解释硫化物材料的溶解，然后在堆积的层状体中的堆积体压实过程中，由于堆积间熔体的上升渗透流的影响而进行的再沉积，从而解释了硫化物材料的运输。在Burakovo–Aganozero入侵中可以观察到这一过程的证据。分析岩体岩石中的铜浓度数据（来自160个钻孔的10,000多个岩心材料样本）揭示了低硫化物矿化的两种分布类型。第一类型的垂直部分的特征在于在整个单斜辉石，斜方（的下部单元的整个厚度分布的矿化斜辉石-斜方辉石）累积，并且在所有上覆的岩石中几乎完全没有硫化物。在第二种类型中，铜矿化被限制在该单元单斜辉石，斜的顶部部分（斜辉石-斜方辉石）进行累积，和单斜辉石，斜斜长的区域（的上覆岩石序列斜辉石-斜方辉石- PL）累计包括强烈矿化的岩石。在DS Korzhinskii的酸-碱相互作用理论范围内的物理化学分析以及熔体主要成分对硫化物相溶解度影响的数值模拟表明，Ca和Mg在液体的不溶混/溶解中起着重要作用。硫化物。针对该岩体的低硫化物矿化作用，提出了一个模型：液相线中的次氯环己烯的出现导致硫化物与液体的不溶混性的开始，并产生了第一类铜的分布。在堆积材料的压实过程中，堆积间熔体的渗透导致硫化物材料的溶解和向上输送数百米，因此产生了第二种类型的Cu分布。