| Occurrences of Excess ^40Ar in Hydrothermal Tourmaline： Interpretations from ^40 Ar-^39Ar Dating Results by Stepwise Heating |
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| 作者姓名： | QIU Huaning PU Zhiping DAI Tongmo |
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| 作者单位： | Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou, Guangdong 510640 |
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| 基金项目： | We would express our thanks to Prof. Zhang Yuquan and Mr. Chen Hesheng for their kind guides during the fieldwork. We are very grateful to Dr. R. Burgess for his comments and suggestions that significantly improved this work. Financial supports came from the National Natural Science Foundation of China （40472048） and the Chinese Academy of Sciences （KZCX2-SW117 and GIGCX-0301）. |
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| 摘 要： | The occurrences of excess ^40Ar within a hydrothermal tourmaline is discussed in term of the analysis data of syngenetic muscovite and tourmaline from the Lushui hydrothermal tin-tungsten deposit in western Yunnan, China, using the ^40Ar-^39Ar stepwise heating technique. About 80% excess ^40 Ar was released in the last step when the tourmaline was fused, corresponding to a release of only -3% ^39 Ar （K）, which indicates that most excess ^40 Ar was held in the mineral lattice rather than in the channels parallel to the Z-axis. This suggests that the excess ^40 Ar was incorporated during crystallization and not diffused into the tourmaline during the post-crystallization history.
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| 关 键 词： | 电气石 加热措施 水热作用 云南 |
| 修稿时间： | 2006-06-092006-12-29 |
Occurrences of Excess ~(40)Ar in Hydrothermal Tourmaline: Interpretations from ~(40)Ar-~(39)Ar Dating Results by Stepwise Heating |
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| Authors: | QIU Huaning PU Zhiping and DAI Tongmo Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences PO Box Guangzhou Guangdong |
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| Abstract: | The occurrences of excess 40Ar within a hydrothermal tourmaline is discussed in term of the analysis data of syngenetic muscovite and tourmaline from the Lushui hydrothermal tin-tungsten deposit in western Yunnan, China, using the 10Ar-39Ar stepwise heating technique. About 80% excess 40Ar was released in the last step when the tourmaline was fused, corresponding to a release of only -3% 39Ar (K), which indicates that most excess 40Ar was held in the mineral lattice rather than in the channels parallel to the Z-axis. This suggests that the excess 40Ar was incorporated during crystallization and not diffused into the tourmaline during the post-crystallization history. |
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| Keywords: | excess ^40 Ar tourmaline ^40 Ar-^39 Ar stepwise heating hydrothermal tin-tungsten deposit Yunnan |
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