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Two-stage magmatism and mineralization of Tulaergen nickel-copper deposit in eastern Tianshan, North-west China: Evidence from bulk rock geochemistry and in situ mineral chemistry
Geological Journal ( IF 1.4 ) Pub Date : 2021-03-30 , DOI: 10.1002/gj.4129 Lin‐Ru Fang 1, 2, 3 , Dong‐Mei Tang 1, 2 , Malte Junge 4 , Ke‐Zhang Qin 1, 2, 3 , Ya‐Jing Mao 1, 2 , Noreen J. Evans 5 , Cora C. Wohlgemuth‐Ueberwasser 6 , Yan‐Jie Niu 1, 7
Geological Journal ( IF 1.4 ) Pub Date : 2021-03-30 , DOI: 10.1002/gj.4129 Lin‐Ru Fang 1, 2, 3 , Dong‐Mei Tang 1, 2 , Malte Junge 4 , Ke‐Zhang Qin 1, 2, 3 , Ya‐Jing Mao 1, 2 , Noreen J. Evans 5 , Cora C. Wohlgemuth‐Ueberwasser 6 , Yan‐Jie Niu 1, 7
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The Tulaergen magmatic Ni–Cu deposit is related to mafic-ultramafic rocks of the Central Asian Orogenic Belt. The ore-host rocks are lherzolite and websterite and the major ore types are net-textured and sparsely disseminated ores. The disseminated ores host high-Fo (82–85) olivine and hornblende with low-Al contents, high-rare earth element (REE) abundances and negative Eu anomalies. The net-textured mineralized lherzolite contains low-Fo (74–82) olivine and high-Al hornblende, the latter characterized by low REE concentrations and no Eu anomaly. The contrasting composition of olivine and hornblende suggests two stages of magmatism. In situ analysis of pentlandite, chalcopyrite and pyrrhotite shows that platinum-group elements contents in sulphides are low. Contrasting Ni, Co, Se, Ag, Cd, and Pb contents in sulphides from net-textured and in disseminated ores also supports two pulses of magmas, each with a distinct chemical composition. High-Mg basaltic magma characterized the first stage, followed by a second-stage less basic magma with a high H2O content. Whole-rock Sr and Nd isotopic signatures suggest that about 4–6% crustal materials were added to the depleted mantle source. The fractional crystallization of olivine and crustal contamination play important roles in sulphur segregation at Tulaergen based on sulphur content at sulphide saturation modelling. Injection of magma enriched in H2O further enhanced sulphide aggregation and deposit forming. It is proposed that two pulses of magma injections occurred at the Tulaergen deposit, with the products of the first pulse settling at the base, and of the second one with dense mineralization laying at the top of the deposit.
中文翻译：
东天山图拉尔根镍铜矿两期岩浆作用与成矿作用：来自大块岩石地球化学和原位矿物化学的证据
图拉尔根岩浆镍铜矿床与中亚造山带的基性-超基性岩有关。赋矿岩为锂辉石和伟晶石，主要矿种为网纹散布矿。浸染矿石含有高 Fo (82-85) 橄榄石和角闪石，具有低 Al 含量、高稀土元素 (REE) 丰度和负 Eu 异常。网纹矿化二长橄榄石含有低 Fo (74-82) 橄榄石和高铝角闪石，后者的特点是低 REE 浓度和无 Eu 异常。橄榄石和角闪石的对比成分表明岩浆作用有两个阶段。对黄铜矿、黄铜矿和磁黄铁矿的原位分析表明，硫化物中铂族元素含量较低。对比 Ni、Co、Se、Ag、Cd、来自网状结构和浸染矿石的硫化物中的铅含量也支持两个岩浆脉冲，每个脉冲都有不同的化学成分。第一阶段以高镁玄武质岩浆为特征，其次是第二阶段的低基性岩浆，具有高 H2 O 含量。全岩 Sr 和 Nd 同位素特征表明，约 4-6% 的地壳物质被添加到枯竭的地幔源中。根据硫化物饱和度模型中的硫含量，橄榄石和地壳污染物的分级结晶在 Tulaergen 的硫分离中起着重要作用。注入富含 H 2 O的岩浆进一步增强了硫化物聚集和沉积物的形成。据推测，图拉尔根矿床发生了两次岩浆注入脉冲，第一次脉冲的产物沉积在底部，第二次脉冲的产物沉积在矿床顶部，密集的矿化作用。
更新日期：2021-03-30
中文翻译：
东天山图拉尔根镍铜矿两期岩浆作用与成矿作用：来自大块岩石地球化学和原位矿物化学的证据
图拉尔根岩浆镍铜矿床与中亚造山带的基性-超基性岩有关。赋矿岩为锂辉石和伟晶石，主要矿种为网纹散布矿。浸染矿石含有高 Fo (82-85) 橄榄石和角闪石，具有低 Al 含量、高稀土元素 (REE) 丰度和负 Eu 异常。网纹矿化二长橄榄石含有低 Fo (74-82) 橄榄石和高铝角闪石，后者的特点是低 REE 浓度和无 Eu 异常。橄榄石和角闪石的对比成分表明岩浆作用有两个阶段。对黄铜矿、黄铜矿和磁黄铁矿的原位分析表明，硫化物中铂族元素含量较低。对比 Ni、Co、Se、Ag、Cd、来自网状结构和浸染矿石的硫化物中的铅含量也支持两个岩浆脉冲，每个脉冲都有不同的化学成分。第一阶段以高镁玄武质岩浆为特征，其次是第二阶段的低基性岩浆，具有高 H2 O 含量。全岩 Sr 和 Nd 同位素特征表明，约 4-6% 的地壳物质被添加到枯竭的地幔源中。根据硫化物饱和度模型中的硫含量，橄榄石和地壳污染物的分级结晶在 Tulaergen 的硫分离中起着重要作用。注入富含 H 2 O的岩浆进一步增强了硫化物聚集和沉积物的形成。据推测，图拉尔根矿床发生了两次岩浆注入脉冲，第一次脉冲的产物沉积在底部，第二次脉冲的产物沉积在矿床顶部，密集的矿化作用。
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