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Mineralogical and Geochemical Features of Pyrite Nodules from Sulfide Turbidites in the Talgan Cu-Zn Massive Sulfide Deposit (Southern Urals)
Lithology and Mineral Resources ( IF 0.7 ) Pub Date : 2019-12-03 , DOI: 10.1134/s0024490219060026
N. R. Ayupova , V. V. Maslennikov , D. A. Artem’ev , I. A. Blinov

Abstract

Pyrite nodules were found in thin-layered sulfide ores localized at the flanks of the Talgan Cu-Zn massive sulfide deposit (South Urals) which consists of (1) an inner core (microgranular pyrite with inclusions of gangue minerals and authigenic sulfides), (2) an intermediate zone (anhedral and subhedral pyrite metacrystals), (3) an outer zone (parallel-columnar subhedral pyrite crystals), and (4) the dioctahedral chlorite rim overgrowing on pyrite crystalls of the outer zone. Each zone is characterized by a specific assemblage of trace elements revealed by the LA-ICP-MS micromapping. The content of trace elements in the pyrite significantly (by 1–3 orders of magnitude) decreases in a range of microgranular pyrite of the core → an- and subhedral pyrite crystals of the intermediate zone → subhedral pyrite crystals of the outer zone (average value, ppm): Zn from 13 106 to 9, Pb from 24 100 to 1783, As from 1323 to 134, Co from 1027 to 1.81, Ni from 456 to 4, Ag from 390 to 38, Au from 0.1 to 0.01, Te from 55 to 0.6, and Bi from 9.8 to 0.6. The subhedral pyrite crystals of the outer zone is enriched in Cu (up to 8367 ppm), Sb (up to 1627 ppm), and Mn (734 ppm), relative to microgranular pyrite of the nodule core. Anomalously high contents of trace elements are related to the presence of authigenic inclusions of chalcopyrite, sphalerite, fahlores, and Au–Ag minerals in the pyrite. Gangue components in nodules include quartz, calcite, chlorite, illite, and REE minerals. The ore clasts of distal sulfide turbidites mixed with hyaloclastites, which were altered during dia- and anadiagenesis, were the source of ore material for the nodules.


中文翻译:

塔尔甘铜锌大量硫化物矿床(南部乌拉尔)中硫化物浊石中硫铁矿结核的矿物学和地球化学特征。

摘要

在位于Talgan Cu-Zn块状硫化物矿床(南乌拉尔)侧面的薄层硫化矿中发现了黄铁矿结核,该矿床由(1)内核(微细粒状黄铁矿,包括脉石矿物和自生硫化物)组成,( 2)中间带(黄铁矿和半角铁黄铁矿偏晶),(3)外部带(平行柱状亚铁黄铁矿晶体),和(4)在外部带的黄铁矿晶体上过度生长的二八面体亚氯酸盐边缘。每个区域的特征是通过LA-ICP-MS微图揭示的痕量元素的特定组合。黄铁矿中微量元素的含量在岩心的微颗粒黄铁矿→中间区域的正,半面黄铁矿晶体→外部区域的亚面黄铁矿晶体的范围内(平均值降低1-3个数量级)(平均值,ppm):Zn从13106到9,Pb从24100到1783,As从1323到134,Co从1027到1.81,Ni从456到4,Ag从390到38,Au从0.1到0.01,Te从55至0.6,Bi从9.8至0.6。相对于结核核的微颗粒黄铁矿,外部区域的亚面半黄铁矿晶体富含铜(高达8367 ppm),锑(高达1627 ppm)和锰(734 ppm)。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。从1323至134,从1027至1.81的Co,从456至4的Ni,从390至38的Ag,从0.1至0.01的Au,从55至0.6的Te,以及从9.8至0.6的Bi。相对于结核核的微颗粒黄铁矿,外部区域的亚面半黄铁矿晶体富含铜(高达8367 ppm),锑(高达1627 ppm)和锰(734 ppm)。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。从1323至134,从1027至1.81的Co,从456至4的Ni,从390至38的Ag,从0.1至0.01的Au,从55至0.6的Te,以及从9.8至0.6的Bi。相对于结核核的微颗粒黄铁矿,外部区域的亚面半黄铁矿晶体富含铜(高达8367 ppm),锑(高达1627 ppm)和锰(734 ppm)。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。Bi从9.8降至0.6。相对于结核核的微颗粒黄铁矿,外部区域的亚面半黄铁矿晶体富含铜(高达8367 ppm),锑(高达1627 ppm)和锰(734 ppm)。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。Bi从9.8降至0.6。相对于结核核的微颗粒黄铁矿,外部区域的亚面半黄铁矿晶体富含铜(高达8367 ppm),锑(高达1627 ppm)和锰(734 ppm)。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。微量元素含量异常高与黄铁矿中黄铜矿,闪锌矿,辉石和Au-Ag矿物的自生包裹体有关。结核中的脉石成分包括石英,方解石,绿泥石,伊利石和REE矿物。在成岩和成岩作用过程中发生了改变的远距离硫化物混浊物与透明质岩混合的矿石碎片是形成结核的矿石原料。
更新日期:2019-12-03
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