| 云南兰坪白秧坪铜钴多金属矿集区矿石中石英的40Ar-39Ar年龄 |
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| 引用本文： | 何明勤,刘家军,李朝阳,李志明,刘玉平,杨爱平,桑海清.云南兰坪白秧坪铜钴多金属矿集区矿石中石英的40Ar-39Ar年龄[J].地质科学,2006,41(4):688-693. |
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| 作者姓名： | 何明勤 刘家军 李朝阳 李志明 刘玉平 杨爱平 桑海清 |
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| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学重点研究实验室, 贵阳, 550002;2. 中国地质大学, 北京, 100083;3. 云南省地质矿产局第三地质大队, 云南, 大理, 671000;4. 中国科学院地质与地球物理研究所, 北京, 100029 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，云南省教育厅资助项目 |
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| 摘 要： | 云南兰坪白秧坪铜钴多金属矿集区矿石中石英的40Ar-39Ar快中子活化年龄谱呈马鞍形,坪年龄为56.53±0.43Ma,最小视年龄为55.52±1.78Ma,等时线年龄为55.90±0.29Ma,三者在误差范围内一致(1σ)。40Ar/36Ar初始值为294.7±1.14,与尼尔值(295.5±5)十分接近,坪年龄和等时线年龄均可作为石英的形成时代。因此,55.90~56.53Ma(喜马拉雅早期)代表了矿床的成矿年龄。
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| 关 键 词： | 40Ar-39Ar年龄 喜马拉雅早期 铜钴多金属矿集区 滇西兰坪 |
| 文章编号： | 0563-5020（2006）04-0688-06 |
| 收稿时间： | 2004-01-08 |
| 修稿时间： | 2004-06-24 |
40Ar-39Ar DATING OF ORE QUARTZ FROM THE BAIYANGPING Cu-Co POLYMETALLIC MINERALIZED CONCENTRATION AREA, LANPING, YUNNAN |
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| He Mingqin,Liu Jiajun,Li Chaoyang,Li Zhiming,Liu Yuping,Yang Aiping,Sang Haiqing.40Ar-39Ar DATING OF ORE QUARTZ FROM THE BAIYANGPING Cu-Co POLYMETALLIC MINERALIZED CONCENTRATION AREA, LANPING, YUNNAN[J].Chinese Journal of Geology,2006,41(4):688-693. |
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| Authors: | He Mingqin Liu Jiajun Li Chaoyang Li Zhiming Liu Yuping Yang Aiping Sang Haiqing |
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| Institution: | 1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;2. China University of Geosciences, Beijing 100083;3. No.3 Geological Party, Bureau of Geology and Mineral Resources of Yunnan Province, Dali, Yunnan 671000;4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | 40Ar-39Ar fast neutron activation age spectrum of quartz in ore collected from the Baiyangping Cu-Co polymetallic mineralized concentration area in Lanping,Yunnan, showed a characteristic of saddle shape. The obtained plateau age,minimum appearance age and isochron age of the spectra were 56.53±0.43 Ma,55.52±1.78 Ma and 55.90±0.29 Ma respectively, all of three ages being identical within 1σ uncertainties. Both of the plateau and isochron ages could be regarded as the quartz’s forming time, since the given 40Ar/36Ar initial value of 294.7±1.14 was very close to Nier’s value (295.5±5), namely, the age of 55.90~56.53 Ma (Early Himalayan period) represented the ore deposits’forming age. |
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| Keywords: | ^40Ar-^39Ar dating Early Himalaya Cu-Co polymetallic mineralized concentration area Lanping in western Yunnan |
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