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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Mg-Sr-Nd isotopic constraints on the genesis of the giant Jinchuan Ni-Cu-(PGE) sulfide deposit, NW China
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Mg-Sr-Nd isotopic constraints on the genesis of the giant Jinchuan Ni-Cu-(PGE) sulfide deposit, NW China

机译：Mg-SR-ND同位素约束对巨型金川Ni-Cu-（PGE）硫化物矿床的成因，NW中国

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摘要

Magmatic sulfide deposits are principal resources of nickel and platinum-group elements (PGE) in the world. These deposits form as the result of the concentration of immiscible sulfide-liquid droplets segregated from mafic or ultramafic magma. Sulfide saturation in the magmas is commonly linked to contamination by the continental crust. The Jinchuan Ni-Cu-(PGE) deposit is the largest single magmatic sulfide deposit in the world. It is hosted by a small mafic-ultramafic intrusion in the North China Craton. The Jinchuan mafic-ultramafic intrusion intruded Paleoproterozoic marbles, gneisses, and granitic migmatites. This paper reports the magnesium, strontium and neodymium isotopic compositions of the intrusion and the country rocks. Olivine, pyroxene and whole rocks of the lherzolites from the Jinchuan intrusion have delta Mg-26 values ranging from -0.40 parts per thousand to -0.26 parts per thousand, with a weighted mean value of -0.31 +/- 0.06 parts per thousand (2SD), which is slightly lighter than expected in a mantle-derived magma. The marble country rocks have relatively light delta Mg-26 values varying from -2.00 parts per thousand to -1.17 parts per thousand, with a weighted mean value of -1.53 +/- 0.02 parts per thousand (2SD). The variations are attributed to the interaction between basaltic magma and marble country rocks as the principal mechanism which generated the low Mg isotopic signatures in the Jinchuan deposit. The (Sr-87/Sr-86)(i) and epsilon(Nd) values of the lherzolites vary from 0.706615 to 0.714612 and from -8.29 to -6.13, respectively. The marble country rocks have relatively high (Sr-87/Sr-86)(i) ratios (0.713662 to 0.740069) and low epsilon(Nd) values (-25.43 to -12.41). The negative Nb anomalies in all samples from the intrusion indicate that the parental magma underwent crustal contamination. Mg-Sr-Nd isotopic mixing calculations indicate that the Jinchuan intrusion underwent 10-20% bulk contamination involving the lower continental crust,
机译：岩浆硫化物沉积物是世界上镍和铂族群体（PGE）的主要资源。这些沉积形式作为由MAFIC或Ultramfic Magma隔离的不混溶的硫化物 - 液滴的浓度的结果。岩浆中的硫化物饱和通常与大陆地壳的污染有关。金川Ni-Cu-（PGE）矿床是世界上最大的单岩硫化物矿床。它是由华北克拉登的小型迈章 - 超空白侵入主持。金川MAFIC-Ultramfic入侵侵入古形蛋白古代大理石，片状和花岗岩Migmatites。本文报告了镁，锶和钕同位素组合物的入侵和乡村岩石。来自金川入侵的Lherzolites的橄榄石，辉石和整体岩石具有Δmg-26值，范围为-0.40份千分之一至-0.26份，加权平均值-0.31 +/- 0.06份（2SD ），在地幔岩浆中略微略微轻。大理石乡村岩石具有相对较轻的Delta Mg-26值，从-2.00分为千点到-1.17份，加权平均值为-1.53​​ +/- 0.02份（2SD）。变化归因于玄武岩岩浆和大理石乡村岩石之间的相互作用作为在金川矿床中产生低Mg同位素签名的主要机制。 Lherzolites的（SR-87 / SR-86）（I）和ε（Nd）值分别从0.706615-0.714612和-8.29至-6.13变化。大理石乡村岩石具有相对较高（SR-87 / SR-86）（I）比率（0.71362至0.740069）和低ε（ND）值（-25.43至-12.41）。来自入侵的所有样品中的阴性Nb异常表明父母岩浆接受了地壳污染。 Mg-SR-ND同位素混合计算表明，金川入侵涉及较低的大陆地壳的10-20％散装污染，

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