Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (2): 511-525.doi: 10.13278/j.cnki.jjuese.201702115

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Eocene Paleomagnetic Inclination Shallowing in Simao Area of the Indochina Block and Its Tectonic Implication

An Chunzhi1,2, Yang Zhenyu3, Tong Yabo1,2, Li ChenHao1,2, Wang Heng1,2, Gao Liang1,2, Han Zhirui1,2, Xu Yingchao1,2   

  1. 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    2. Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources, Chinese Academy of Geological Sciences, Beijing 100081, China;
    3. College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China
  • Received:2016-12-23 Online:2017-03-26 Published:2017-03-26
  • Supported by:
    Supported by the Geological Survey Project of China Geological Survey (1212011120164,12120114002301) and the National Natural Science Foundation of China (41202162)

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Abstract: Paleomagnetic inclination shallowing studies were carried out on the Eocene red beds in Simao area of the Indochina block. High-temperature magnetic components were isolated from the Mengban and Mengla sections, the tilt corrected site-mean directions at Mengban and Mengla are Ds=118.2°, Is=22.1°, k=31.6, α95=10.9°, and Ds=47.6°, Is=22.8°, k=20.2, α95=5.9°, respectively, which are consistent with those previous research results in these areas. The inclination shallowing correction method proposed by Hodych & Buchan and elongation/inclination (E/I) correction are used to quantitatively estimate the inclination bias of Eocene red-beds in the Mengban and Mengla area. The corrected inclinations are 28.4°±4.3° and 30.7°[25.4°, 35.9°] following the method of Hodych & Buchan and E/I correction,respectively. These results indicate that deposition and/or compaction induced inclination shallowing existed in the Paleogene red-beds in the southern part of Simao terrane. The usage of E/I correction is limited in the strata with weak deformation, in which the influence of plunging fold or local rotational deformation will strongly deviate the declinations. Hodych & Buchan's method is more reliable for the inclination correction of red beds. Combining with previous paleomagnetic data from the Indochina block, these results presented in this paper indicate that the Indochina block has been subjected to southeastward displacement by 500 km with respect to the South China block since the Eocene.

Key words: Indochina block, Eocene, block movement, paleomagnetism, inclination shallowing

CLC Number: 

  • P618.81
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