Norilsk地区Imangda岩群Rudnaya岩脉铜硫化物矿化与高镍橄榄石来源:基于成分、同位素和模型数据

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
V. D. Brovchenko, I. A. Kirillina, M. A. Yudovskaya, G. Costin, I. V. Pshenitsyn, E. V. Kovalchuk, Yu. O. Larionova, Yu. D. Gritsenko, A. A. Ketrov, S. F. Sluzhenikin
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引用次数: 0

摘要

Imangda矿群的Rudnaya岩脉由弱分异的含橄榄石-橄榄石辉长岩组成,含黄铜矿-立方铁矿-(粒状-磁黄铁矿)的球状和间隙硫化物。随着硫化物矿化,岩脉辉长岩中含有角化玄武岩包体、丰富的杏仁核和罕见的分带橄榄石-1 Fo90-47,与第二代半面状橄榄石Fo74-36共存。COMAGMAT和alphamelt程序模拟表明,含cr尖晶石包裹体的高mg的Ol-1不能从富铁的拉斑岩熔体中结晶,这些熔体的MgO含量为4.8-7.3 wt %, Fe2O3总量为11.6-16.7 wt %,是岩脉的母体。与诺里斯克地区含矿侵入体和苦荞质玄武岩中最大的Fo83和0.4 wt % NiO相比,Fo90-76的异晶橄榄石岩心Ni含量的变化趋势和高达0.5 wt % NiO的高Ni含量表明苦荞质岩浆存在于深部,未与硫化物液体交换。铂族元素(PGE)丰度随着整个岩石中Cu/Ni的增加和硫化物组合中镍黄铁矿比例的增加而增加(最高可达2.2 ppm)。亲铜金属的特定分布模式(Ni、Os和Ir最小,Cu/Ni(5-15)和Cu/Pd(3200-10 900)升高,硫化物中PGE含量(100%硫化物中PGE含量)(2-65 ppm)和镍黄铁矿中Pd含量(175 ppm)较含矿侵入体低)表明,铜硫化物矿化不是从含矿岩浆的高分异硫化物部分中物理捕获的,而是与岩脉岩浆共成的。岩脉内硫化物的平均δ34S = 14.7±1.1‰(n = 31),接近于泥盆系含矿侵入体内接触带硫化物的δ34S平均值(14.7±1.1‰),在岩脉内蒸发岩中沉积硫和挥发物的同化作用下实现了硫化物的饱和和脱气。脉岩的初始同位素特征(Sri 0.70517-0.70532, ε Nd从-0.4 ~ 0.8)暗示其与norilsk型侵入岩的岩浆成因,但总体数据不排除其与上地壳含矿岩浆管道网络的空间联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Sources of Cuprous Sulfide Mineralization and High-Ni Olivine of the Rudnaya Dyke (Imangda Cluster, Norilsk region): Based on Compositional, Isotope and Model Data

Sources of Cuprous Sulfide Mineralization and High-Ni Olivine of the Rudnaya Dyke (Imangda Cluster, Norilsk region): Based on Compositional, Isotope and Model Data

The Rudnaya dyke of the Imangda ore cluster is composed of weakly differentiated olivine-bearing to olivine gabbrodolerites with globular and interstitial sulfides of a chalcopyrite–cubanite- (pentlandite-pyrrhotite) composition. Along with sulfide mineralization, gabbrodolerites of the dyke contain xenoliths of hornfelsed basalts, abundant amygdales and rare grains of zoned olivine-1 Fo90–47 that coexists with subhedral olivine Fo74–36 of the second generation. Modeling with the COMAGMAT and alphaMELTS programs showed that high-Mg Ol-1 with Cr-spinel inclusions cannot be crystallized from a Fe-enriched tholeiitic melt with 4.8–7.3 wt % MgO and 11.6–16.7 wt % total Fe2O3 that is parental for the dyke. The variation trend and high Ni up to 0.5 wt % NiO in the cores of xenocrystic olivine Fo90–76 in contrast to maximum Fo83 and 0.4 wt % NiO in olivine from the ore-bearing intrusions and picritic basalts of the Norilsk region point toward the presence of deep-seated cumulates of picritic magmas, which had not exchanged with sulfide liquid. Platinum group element (PGE) abundances increase (up to 2.2 ppm) with increasing Cu/Ni in the whole rocks and proportions of pentlandite in a sulfide association. A specific pattern of chalcophile metal distribution with Ni, Os and Ir minima, elevated Cu/Ni (5–15) and Cu/Pd (3200–10 900) along with lower PGE tenor (PGE content in 100% sulfide) of sulfides (2–65 ppm) and Pd content in pentlandite (<175 ppm) compared to those of the ore-bearing intrusions suggest that cuprous sulfide mineralization was not physically captured from highly fractionated sulfide fractions of ore-bearing magmas but is cogenetic with a magma of the dyke. Sulfide saturation, near-simultaneous with fluid saturation and degassing, was achieved in the dyke conduit due to assimilation of sedimentary sulfur and volatiles from Devonian evaporites that is supported by the heavy S isotope composition of dyke’s sulfides with the average δ34S = 14.7 ±1.1‰ (n = 31) close to the values for sulfides from the endocontact zones of the Imangda ore-bearing intrusions hosted by the Devonian sequences. The initial isotopic characteristics of dyke rocks (Sri 0.70517–0.70532, ɛNd from –0.4 to 0.8) imply its comagmatic origin with the Norilsk-type intrusions whereas the overall data do not exclude its spatial connection with an upper crustal conduit network of the ore-bearing magmas.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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