The Pulang Porphyry Copper Deposit and Associated Felsic Intrusions in Yunnan Province, Southwest China
The Pulang Porphyry Copper Deposit and Associated Felsic Intrusions in Yunnan Province, Southwest China
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DOI：
10.2113/econgeo.106.1.79
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发表时间：
2011
期刊：
影响因子：
5.8
通讯作者：
L. Wenchang;Zeng Pu-sheng;Hou Zengqian;N. White
中科院分区：
文献类型：
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作者：
L. Wenchang;Zeng Pu-sheng;Hou Zengqian;N. White
滇西北普朗斑岩铜存款矿床位于三叠纪义敦岛弧南端。迄今为止，普朗地区已确定了15个矿化斑岩矿床，估计铜资源量超过1000万吨。普朗存款，目前定义，是由五个含矿斑岩矿床，占地面积约9平方公里。普朗地区广泛分布着由石英闪长岩、二长闪长岩、石英二长岩和花岗闪长岩组成的中酸性斑状侵入体。斑岩矿床的蚀变带包括石英带、硅酸钾带、石英绢云母带和绿帘岩带。斑岩矿床在与板岩、砂岩、安山岩接触处有角岩。辉长岩Re-Os年龄、黑云母Ar/Ar和K-Ar年龄表明，普朗斑岩铜存款形成于印支期构造幕，主要成矿期为216 ~ 213 Ma（晚三叠世诺利期），而整个热液活动过程包括叠加作用可能为235 ~ 182.5 Ma。
The Pulang porphyry copper deposit recently discovered in northwestern Yunnan province, China, is located at the south end of the Triassic Yidun island arc. To date, 15 mineralized porphyry deposits have been defined in the Pulang area and the copper resource is estimated to exceed 10 Mt. The Pulang deposit, as currently defined, is made up of five ore-bearing porphyry deposits, covering an area of approximately 9 km2. Intermediate acidic porphyritic intrusions composed of quartz-diorite, monzodiorite, quartz-monzonite, and granodiorite are widespread in the Pulang area. The alteration zones identified with the porphyry deposits include silicic, potassium silicate, quartz-sericite, and propylitic zones. The porphyry deposits have hornfels at the contact with slate, sandstone, and andesite. Re-Os ages of molybdenite, and Ar/Ar and K-Ar dating of biotite indicate that the Pulang porphyry copper deposit formed during the Indosinian tectonic episode, with the main ore formation taking place from 216 to 213 Ma (Late Triassic, Norian); however, the whole process of hydrothermal activity, including overprinting, may have extended from 235 to 182.5 Ma.