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Geochemical discrimination of intrusions in the Choran Cu Au deposit, Iran, using silicate chemistry
Journal of Geochemical Exploration ( IF 3.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.gexplo.2020.106589
Alireza Zarasvandi , Majid Tashi , Johann G. Raith , Mohsen Rezaei , Fardin Mousivand , Adel Saki

Abstract The Choran Cu Au deposit is located 70 km of Bardsir in the southern part of Urumieh-Dokhtar magmatic belt (UDMB). In this area, mineralization is associated with Oligocene –Miocene quartz diorite and granodiorite intrusions emplaced within Eocene volcanic–pyroclastic – sedimentary sequences. Main hydrothermal alterations in the Choran region include sodic-potassic and potassic as well as phyllic, alunite and kaolinite which extended mostly in the granodiorite. Mineralizations at the Choran deposit involve pyrite, arsenopyrite, chalcopyrite, chalcocite, covellite and sphalerite. The composition of the plagioclase in the granodiorite and quartz diorite rocks ranges from albite (66.8 to 48.7) and (64.8 to 51.4) respectively. Also, Al/(Ca + Na + K) ratios of plagioclase in granodiorite samples (average; 1.50) are higher than that of quartz diorite intrusions (average; 1.33) which is analogous to those reported previously for mineralized porphyry systems. All studied primary and re-equilibrated biotites are collectively clustered in the Mg-biotite field. However, based on the log (XMg/XFe) versus log (XF/XOH) of biotite, granodiorite units are associated with I-type moderately crustal contaminated (I-MC) suite, whereas quartz diorite biotites represent I-type weakly crustal contaminated (I-WC) character. Comparison of biotite halogen contents indicates that F and Cl values increase from quartz diorite to granodiorite intrusions. Importantly, biotite thermometry of granodiorite and quartz diorite samples indicate temperatures of

中文翻译:

使用硅酸盐化学对伊朗 Choran Cu Au 矿床中侵入体的地球化学判别

摘要 Choran Cu Au 矿床位于Urumieh-Dokhtar 岩浆带(UDMB) 南部Bardsir 70 公里处。在该地区,矿化与渐新世-中新世石英闪长岩和花岗闪长岩侵入体有关,这些侵入体位于始新世火山-火山碎屑-沉积层序中。Choran地区的主要热液蚀变包括钠钾质和钾质以及主要在花岗闪长岩中延伸的页岩、明矾石和高岭石。Choran 矿床的矿化包括黄铁矿、毒砂、黄铜矿、辉铜矿、铜锌矿和闪锌矿。花岗闪长岩和石英闪长岩中斜长石的组成范围分别为钠长石(66.8 至 48.7)和(64.8 至 51.4)。此外,花岗闪长岩样品中斜长石的 Al/(Ca + Na + K) 比率(平均值;1. 50)高于石英闪长岩侵入体(平均值;1.33),这类似于先前报道的矿化斑岩系统。所有研究的原生和重新平衡的黑云母都集中在镁黑云母领域。然而,基于黑云母的 log (XMg/XFe) vs log (XF/XOH),花岗闪长岩单元与 I 型中度地壳污染 (I-MC) 套件相关,而石英闪长岩黑云母代表 I 型弱地壳污染(I-WC) 字符。黑云母卤素含量的比较表明,从石英闪长岩到花岗闪长岩侵入体,F 和 Cl 值增加。重要的是,花岗闪长岩和石英闪长岩样品的黑云母温度测量表明温度为 所有研究的原生和重新平衡的黑云母都集中在镁黑云母领域。然而,基于黑云母的 log (XMg/XFe) vs log (XF/XOH),花岗闪长岩单元与 I 型中度地壳污染 (I-MC) 套件相关,而石英闪长岩黑云母代表 I 型弱地壳污染(I-WC) 字符。黑云母卤素含量的比较表明,从石英闪长岩到花岗闪长岩侵入体,F 和 Cl 值增加。重要的是,花岗闪长岩和石英闪长岩样品的黑云母温度测量表明温度为 所有研究的原生和重新平衡的黑云母都集中在镁黑云母领域。然而,基于黑云母的 log (XMg/XFe) vs log (XF/XOH),花岗闪长岩单元与 I 型中度地壳污染 (I-MC) 套件相关,而石英闪长岩黑云母代表 I 型弱地壳污染(I-WC) 字符。黑云母卤素含量的比较表明,从石英闪长岩到花岗闪长岩侵入体,F 和 Cl 值增加。重要的是,花岗闪长岩和石英闪长岩样品的黑云母温度测量表明温度为 而石英闪长岩黑云母代表I型弱地壳污染(I-WC)特征。黑云母卤素含量的比较表明 F 和 Cl 值从石英闪长岩到花岗闪长岩侵入体增加。重要的是,花岗闪长岩和石英闪长岩样品的黑云母温度测量表明温度为 而石英闪长岩黑云母代表I型弱地壳污染(I-WC)特征。黑云母卤素含量的比较表明,从石英闪长岩到花岗闪长岩侵入体,F 和 Cl 值增加。重要的是,花岗闪长岩和石英闪长岩样品的黑云母温度测量表明温度为
更新日期:2020-10-01
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