Geochronology and origin of the Sarekoubu gold deposit, southern Altaides, China: Ar-Ar dating of vein quartz and Cu-Zn-Fe isotopes
Geochronology and origin of the Sarekoubu gold deposit, southern Altaides, China: Ar-Ar dating of vein quartz and Cu-Zn-Fe isotopes
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中国阿尔泰德南部萨雷库布金矿的年代学和成因：脉石英和铜锌铁同位素的 Ar-Ar 定年
DOI：
10.1016/j.oregeorev.2020.103642
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发表时间：
2020-09
影响因子：
3.3
通讯作者：
Chunjing Bian
中科院分区：
文献类型：
--
作者：
Jiuhua Xu;Hui Zhang;Longhua Lin;Xing Xiao;Chunjing Bian
萨热库布金矿床位于中国阿勒泰市北部，具有丰富的含碳（CO2-CH4-N2）流体包裹体的不寻常特征。多年来，萨雷库布矿床的年龄和成因仍然存在争议。金矿赋存于与下泥盆统康布铁堡组（D1k22）地层平行的断裂带中，具有三个热液成矿阶段：（一）浸染状黄铁矿和白色石英脉阶段； (II)细石英和黄铁矿细脉阶段； (III)多金属硫化物-灰色石英阶段。第二阶段和第三阶段是主要的金矿化阶段。选择来自 III 期的两块含金黄铜矿石英脉样品进行 40Ar-39Ar 年龄研究。结果表明，成矿期石英中流体包裹体的等时年龄为216.9±6.7Ma和218.0±6.3Ma，反等时年龄为218.3±6.1Ma和216.7±6.4Ma。 Fe同位素分析表明Sarekoubu金矿床与VMS/SEDEX矿床不同。萨热库布金矿主成矿期黄铁矿δ56Fe值Fe同位素范围变化较大（-0.498‰~0.759‰），可视为Fe同位素封闭热液系统。 Sarekoubu 金矿床和邻近 Tiemurte 矿床叠印金矿化的黄铜矿 δ65Cu 值范围较窄（-0.28–0.922‰），这与具有较宽 δ65Cu 值范围的 VMS 矿床不同。萨雷库布金矿床的金矿化年龄比额尔齐斯构造带附近的金矿床更年轻。这可能与阿尔泰德南部额尔齐斯构造带逆冲构造演化有关。
The Sarekoubu gold deposit, located north to Altay city, China, has an unusual feature for abundant carbonic (CO2-CH4-N2)-bearing fluid inclusions. For many years, the ages and origin of the Sarekoubu deposit have been still controversial. The gold deposit occurs in the fractured zone parallel to the strata of lower Devonian Kangbutiebao Formation (D1k22), and has three hydrothermal mineralizing stages: (I) disseminated pyrite and white quartz vein stage; (II) fine quartz and pyrite veinlet stage; and (III) polymetallic sulfides-grey quartz stage. Stages II and III are the main gold mineralization stages. Two gold-bearing chalcopyrite-quartz vein samples from stage III were selected for40Ar–39Ar age study. The result shows that fluid inclusions in quartz of mineralizing stage have isochronal ages of 216.9 ± 6.7 Ma and 218.0 ± 6.3 Ma, and inverse isochronal ages of 218.3 ± 6.1 Ma and 216.7 ± 6.4 Ma. The Fe isotope analysis shows that the Sarekoubu gold deposit is different from VMS/SEDEX deposits. The δ56Fe values of pyrite from main mineralization stages in the Sarekoubu gold deposit have a large variation of Fe isotope range (from −0.498‰ to 0.759‰), which can be regarded as a closed hydrothermal system for Fe isotopes. The δ65Cu values of chalcopyrite both from the Sarekoubu gold deposit and overprint gold mineralization of adjacent Tiemurte deposit have a narrow range (−0.28–0.922‰), which are not the same as VMS deposits with a wide range of δ65Cu values. The gold mineralization in the Sarekoubu deposit is younger than the gold deposits near regional Irtysh Tectonic Belt. This may be related with the evolution of the thrust of the Irtysh Tectonic Belt in the southern Altaides.
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