| Meso-Cenozoic uplifting and exhumation on Yunkaidashan： Evidence from fission track thermochronology |
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| 作者姓名： | LIXiaoming WANGYuejun TANKaixuan PENGTouping |
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| 作者单位： | [1]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China／／GraduateSchool,ChineseAcademyofSciences,Beijing100039,China [2]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China [3]ResourcesandEnvironmentEngineering,NanhuaUniversity,Hengyang421001,China |
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| 摘 要： | Yunkaidashan, located at the southern South China block (SCB) and closely adjacent to the Indochina block, is an ideal region for better understanding the temporal and spatial framework of tectonothermal overprinting at the southern SCB since Mesozoic. Apatite and zircon fission track thermochronology of various-type rocks from Yunkaidashan is presented in this paper. The results show, no matter what rocks are, the apparent ages of zircon fission track range from 97.4 to 133.0 Ma, and those of apatite fission track from 43.2 to 68.4 Ma. The length of apatite fission track yields an average confined track length of -13 μm andshows normal distribution of unimodal frequency. It is inferred that the uplifting amplitude has been more than 5 km in Yunkaidashan since late Mesozoic. The difference of fission track apparent ages at different locations in Yunkaidashan suggests a paleophysiognomic scenario of the heterogeneous uplift/denudation. These data of the fission track thermochronology provide new constraints for better understanding the tectonophysiognomic pattern of the SCB sincelate Mesozoic.
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| 关 键 词： | 岩石学 锆石 磷灰石 风化作用 腐蚀作用 |
| 收稿时间： | 20 September 2004 |
Meso-Cenozoic uplifting and exhumation on Yunkaidashan: Evidence from fission track thermochronology |
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| LIXiaoming WANGYuejun TANKaixuan PENGTouping.Meso-Cenozoic uplifting and exhumation on Yunkaidashan: Evidence from fission track thermochronology[J].Chinese Science Bulletin,2005,50(9):903-909. |
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| Authors: | Li Xiaoming Wang Yuejun Tan Kaixuan Peng Touping |
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| Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, China;(3) Resources and Environment Engineering, Nanhua University, 421001 Hengyang, China |
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| Abstract: | Yunkaidashan, located at the southern South China block (SCB) and closely adjacent to the Indochina block, is an ideal region
for better understanding the temporal and spatial framework of tectonothermal overprinting at the southern SCB since Mesozoic.
Apatite and zircon fission track thermochronology of various-type rocks from Yunkaidashan is presented in this paper. The
results show, no matter what rocks are, the apparent ages of zircon fission track range from 97.4 to 133.0 Ma, and those of
apatite fission track from 43.2 to 68.4 Ma. The length of apatite fission track yields an average confined track length of
∼13 μm and shows normal distribution of unimodal frequency. It is inferred that the uplifting amplitude has been more than
5 km in Yunkaidashan since late Mesozoic. The difference of fission track apparent ages at different locations in Yunkaidashan
suggests a paleophysiognomic scenario of the heterogeneous uplift/denudation. These data of the fission track thermochronology
provide new constraints for better understanding the tectonophysiognomic pattern of the SCB since late Mesozoic. |
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| Keywords: | fission track thermochronology zircon and apatite cool- ing and denudation Yunkaidashan |
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