首页> 外文期刊>Geology of Ore Deposits: A Journal of Theoretical and Applied Papers on All Aspects of Ore Genesis >Isotope (d(34)S, d(13)C, d(18)O) Compositions of Disseminated Sulfide Mineralization in Igneous Rocks of the Dukat Ore Deposit (Northeastern Russia)
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Isotope (d(34)S, d(13)C, d(18)O) Compositions of Disseminated Sulfide Mineralization in Igneous Rocks of the Dukat Ore Deposit (Northeastern Russia)

机译:同位素(D(34),D(13)C,D(18)o)在Dukat矿床(东北北部)的发芽岩石中的脱落硫化物矿化的组成

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The paper discusses a study of variations in the S-34, C-13, O-18 compositions of disseminated sulfides and the carbonate phase, occurring in trace amounts in igneous rocks, which control the outlines of the unique Dukat Au-Ag deposit (northeastern Russia). The parameters obtained were compared with similar isotope parameters of ore assemblages of the same deposit. The S-34 values in sulfides and jarosite sampled in igneous rocks lie in a narrow interval (from -3.4 to + 3.6 parts per thousand), which is comparable with the interval of S-34 variations in sulfides from orebodies (from -4.5 to + 2.0 parts per thousand). Sulfur in pyrite of the early generation from K-Na leucogranites and pyrite from orebodies originated from the same source. Pyrite formed at late magmatic stages is characterized by a lighter sulfur isotope composition. Carbonate phases in igneous rocks of the Dukat ore deposit have low C-13 values (from -12.8 to -8.8 parts per thousand). Based on oxygen isotope composition, carbonates are subdivided into two groups: those in equilibrium with the silicate matrix of rocks at high temperatures and those with abnormally low O-18 values (from -0.8 to +0.9 parts per thousand). The data obtained can be described by a model that proposes that the formation of the sulfur isotope composition in sulfide and carbonate occurs in the process of thermochemical sulfate reduction (TSR) due to oxidation of organic carbon. Calculations show that the S-34 and C-13 values measured in rocks and ore assemblages of the Dukat ore deposit may have appeared due to abiogenic reduction of marine sulfate in a temperature range of 300-450 degrees C. Comparison ofates in orebodies may have been country (underlying) rocks and the fluid released from cooling intrusive bodies of K-Na leucogranites, in which about 80% CO2 is lost. the isotope parameters of carbonates from rocks and ore assemblages show that the source of carbon
机译:本文讨论了S-34,C-13,O-18 o-18组成的变异的研究,散布硫化物和碳酸酯相的含量在火岩中发生,其控制独特Dukat Au-Ag沉积物的轮廓(俄罗斯东北部)。将获得的参数与相同沉积物的矿石组件的类似同位素参数进行比较。在火岩中取样的硫化物中的S-34值和jorogled在狭窄的间隔(从-3.4至+ 3.6份/份)中,与来自Orebodies的S-34变异的间隔相当(从-4.5到+ 2.0份千分之一)。从K-Na Leucogranites和来自来自同一来源的矿石的黄铁矿中硫都是硫铁矿。在晚期岩岩阶段形成的硫铁矿的特征在于较轻的硫同位素组合物。 Dukat矿床的火岩中的碳酸盐阶段具有低C-13值(从-12.8至-8.8份/份)。基于氧同位素组成,碳酸盐分为两组:高温下岩石硅酸盐血管平衡的那些,o-18值异常(从-0.8至+ 0.9份)的硅酸盐矩阵。所获得的数据可以通过模型描述,该模型提出,由于有机碳的氧化,在热化学硫酸盐还原(TSR)的过程中,在硫化物和碳酸盐中形成硫同位素组合物的形成。计算表明,在岩石和矿石沉积物的岩石和矿石组合中测量的S-34和C-13值可能由于在300-450℃的温度范围内的越野硫酸盐的辐射还原而出现。对矿物学的比较可能具有一直是国家(底层)岩石和从K-Na Leucogranites的冷却侵入式体释放的流体,其中约80%的CO 2丢失。来自岩石和矿石组合的碳酸盐的同位素参数表明碳源

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