| Geological analysis and FT dating of the large-scale right-lateral strike-slip movement of the Red River fault zone |
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| 作者姓名： | XIANG HongFa WAN JingLin HAN ZhuJun GUO ShunMin ZHANG WanXia CHEN LiChun & DONG XingQuan Institute of Geology China Earthquake Administration Beijing China Earthquake Administration of Yunnan Province Kunming China |
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| 作者单位： | XIANG HongFa1，WAN JingLin1，HAN ZhuJun1，GUO ShunMin1，ZHANG WanXia1，CHEN LiChun1 & DONG XingQuan2 1 Institute of Geology，China Earthquake Administration，Beijing 100029，China; 2 Earthquake Administration of Yunnan Province，Kunming 650204，China |
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| 基金项目： | the National Natural Science Foundation of China (Grant No.40272087) |
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| 摘 要： | Tectonically, the large-scale right-lateral strike-slip movement along the Red River fault zone is char-acterized at its late phase with the southeastward extension and deformation of the Northwestern Yunnan normal fault depression on its northern segment, and the dextral shear displacement on its central-southern segment. Research of the relations between stratum deformation and fault movement on the typical fault segments, such as Jianchuan, southeast Midu, Yuanjiang River, Yuanyang, etc. since the Miocene Epoch shows that there are two times dextral faulting dominated by normal shearing occurring along the Red River fault zone since the Miocene Epoch. The fission track dating (abbrevi-ated to FT dating, the same below) is conducted on apatite samples collected from the above fault segments and relating to these movements. Based on the measured single grain’s age and the con-fined track length, we choose the Laslet annealing model to retrieve the thermal history of the samples, and the results show that the fault zone experienced two times obvious shear displacement, one in 5.5 ± 1.5 MaBP and the other in 2.1± 0.8 MaBP. The central-southern segment sees two intensive uplifts of mountain mass in the Yuanjiang River-Yuanyang region at 3.6―3.8 MaBP and 1.6―2.3 MaBP, which correspond to the above-mentioned two dextral normal displacement events since the late Miocene Epoch.
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| 收稿时间： | 10 April 2006 |
| 修稿时间： | 21 July 2006 |
Geological analysis and FT dating of the large-scale right-lateral strike-slip movement of the Red River fault zone |
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| XIANG HongFa,WAN JingLin,HAN ZhuJun,GUO ShunMin,ZHANG WanXia,CHEN LiChun & DONG XingQuan Institute of Geology,China Earthquake Administration,Beijing ,China, Earthquake Administration of Yunnan Province,Kunming ,China.Geological analysis and FT dating of the large-scale right-lateral strike-slip movement of the Red River fault zone[J].Science in China(Earth Sciences),2007,50(3):331-342. |
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| Authors: | Xiang HongFa Wan JingLin Han ZhuJun Guo ShunMin Zhang WanXia Chen LiChun Dong XingQuan |
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| Institution: | (1) Institute of Geology, China Earthquake Administration, Beijing, 100029, China;(2) Earthquake Administration of Yunnan Province, Kunming, 650204, China |
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| Abstract: | Tectonically, the large-scale right-lateral strike-slip movement along the Red River fault zone is characterized at its late
phase with the southeastward extension and deformation of the Northwestern Yunnan normal fault depression on its northern
segment, and the dextral shear displacement on its central-southern segment. Research of the relations between stratum deformation
and fault movement on the typical fault segments, such as Jianchuan, southeast Midu, Yuanjiang River, Yuanyang, etc. since
the Miocene Epoch shows that there are two times dextral faulting dominated by normal shearing occurring along the Red River
fault zone since the Miocene Epoch. The fission track dating (abbreviated to FT dating, the same below) is conducted on apatite
samples collected from the above fault segments and relating to these movements. Based on the measured single grain’s age
and the confined track length, we choose the Laslet annealing model to retrieve the thermal history of the samples, and the
results show that the fault zone experienced two times obvious shear displacement, one in 5.5 ± 1.5 MaBP and the other in
2.1 ± 0.8 MaBP. The central-southern segment sees two intensive uplifts of mountain mass in the Yuanjiang River-Yuanyang region
at 3.6–3.8 MaBP and 1.6–2.3 MaBP, which correspond to the above-mentioned two dextral normal displacement events since the
late Miocene Epoch.
Sponsored by the National Natural Science Foundation of China (Grant No. 40272087) |
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| Keywords: | geological analysis fission track dating the Red River fault dextral displacement times |
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