Age of the Baishiqun Mafic-Ultramafic Complex, Hami, Xinjiang and Its Geological Significance
Age of the Baishiqun Mafic-Ultramafic Complex, Hami, Xinjiang and Its Geological Significance
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发表时间：
2005
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通讯作者：
Wu Hua
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作者：
Wu Hua
白石泉铜镍存款矿床位于中天山地块北方边缘，沙泉子深大断裂南侧。矿石产于同源同期的中基性-超基性杂岩体中，多产于单斜橄榄岩和斜长橄榄辉石岩中。铜镍矿化与镁铁质-超镁铁质杂岩有密切的时空关系，是岩浆熔离作用的产物。锆石SHRIMP U-Pb定年结果表明，矿田石英闪长岩、辉长闪长岩和辉长岩的结晶年龄分别为285±10 Ma、284±9 Ma（95%置信度）和284±8 Ma（95%置信度），表明杂岩体侵入及相关成矿作用发生在晚石炭世末、早二叠世初，造山伸展动力学背景
The Baishiquan Cu-Ni deposit is located on the northern margin of the Middle Tianshan Massif and to the south of the Shaquanzi deep-seated fault. Ores distribute in the intermediate-mafic-ultramafic complex of the same source and the same period and usually in clinopyroxene peridotite and plagioclase olivine pyroxenite. Cu-Ni mineralization shows close time-spatial relationship with the mafic-ultramafic complex and formed through magmatic liquation. Zircon SHRIMP U-Pb dating shows that the quartz diorite, gabbro-diorite and gabbro of the orefield has a crystallization age of 285±10 Ma, 284±9 Ma (95% confidence) and 284±8 Ma (95% confidence), respectively, implying that the intrusion of the complex and related mineralization occurred at the end of the Late Carboniferous and the beginning of the Early Permian and in a post-orogenic extensional dynamic setting.