| ^40Ar-^39 Ar Dating of Quartz from Ore in the Baiyangping Cu-Co Polymetallic Ore-Concentrated Area, Lanping Basin, Yunnan |
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| 摘 要： |
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| 关 键 词： | 氩 年龄测定 喜玛拉雅早期运动 铜-钴多金属矿集中地区 云南西部 |
| 收稿时间： | 7 June 2010 |
40Ar−39Ar dating of quartz from ore in the baiyangping Cu−Co polymetallic ore-concentrated area,Lanping Basin,Yunnan |
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| Authors: | Mingqin He Jiajun Liu Chaoyang Li Zhiming Li Yuping Liu Aiping Yang Haiqing Sang |
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| Institution: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) China University of Geosciences, 100083 Beijing, China;(3) No. 3 Geological Party of Yunnan Bureau of Geology and Mineral Resources, 671000 Dali, China;(4) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China |
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| Abstract: | 40Ar−39Ar fast neutron activation age spectrum of quartz in ore collected from the Baiyangping Cu−Co polymetallic ore-concentrated
area, Lanping Basin, is saddle-shaped. The plateau age, minimum appearance age and isochron age shown on the spectra are 56.53±0.43
Ma, 55.52±1.78 Ma and 55.90±0.29 Ma respectively. The age data are consistent with each other within 1σ uncertainties. Because
the given initial40Ar/36Ar value of 294.7±1.14 is very close to Nier's value (295.5±5), both plateau and isochron ages may be considered as the forming
time of quartz. So the age of 55.90–56.53 Ma represents the forming age of ore deposits. It is obvious that the ore deposits
were formed during the Early Himalayan period.
This research project was granted by the State Basic Research, Development and Planning Program (G1999043208) and the Foundation
Projects of Yunnan Provincial Education Department (No. 0142104). |
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| Keywords: | 40Ar− 39Ar dating Early Himalayan Cu− Co polymetallic ore-concentrated area Lanping West Yunnan |
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