吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (2): 511-525.doi: 10.13278/j.cnki.jjuese.201702115

• 地质与资源 • 上一篇    下一篇

印支地块思茅地区始新统磁倾角偏低现象及其构造意义

安纯志1,2, 杨振宇3, 仝亚博1,2, 李晨皓1,2, 王恒1,2, 高亮1,2, 韩志锐1,2, 徐颖超1,2   

  1. 1. 中国地质科学院地质力学研究所, 北京 100081;
    2. 国土资源部古地磁与古构造重建重点实验室, 北京 100081;
    3. 首都师范大学资源环境与旅游学院, 北京 100048
  • 收稿日期:2016-12-23 出版日期:2017-03-26 发布日期:2017-03-26
  • 通讯作者: 杨振宇(1963-),男,博士,教授,博士生导师,杰青,主要从事古地磁与大地构造学研究,E-mail:yangzhenyu@cags.ac.cn E-mail:yangzhenyu@cags.ac.cn
  • 作者简介:安纯志(1987-),男,研究生,主要从事古地磁与古地理研究,E-mail:ancz1987@163.com
  • 基金资助:
    中国地质调查局地质调查项目（1212011120164，12120114002301）；国家自然科学基金项目（41202162）

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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摘要： 对印支地块思茅地区始新世陆相红层进行古地磁研究，获得勐伴剖面特征剩磁方向为Ds=118.2°，Is=22.1°，k=31.6，α95=10.9°；勐腊剖面特征剩磁方向为Ds=47.6°，Is=22.8°，k=20.2，α95=5.9°。其特征剩磁方向与前人研究结果基本一致。利用Hodych等的磁倾角校正方法得到校正磁倾角为28.4°±4.3°，对前人的数据重新进行E/I统计得到的校正磁倾角值为30.7°，置信区间为[25.4°，35.9°]，两种不同方法得到了较一致的结果，思茅地区的古近纪磁倾角显示了一定程度的偏低。E/I磁倾角偏低检验方法在应用时存在一定的局限性，变形微弱地层的古地磁学数据适合进行E/I磁倾角偏低校正，以避免倾伏褶皱或差异性旋转变形作用对E/I磁倾角偏低校正的影响。Hodych等提出的磁倾角校正方法是现今比较可靠的磁倾角校正方法。结合前人印支地块的古地磁研究成果，本次研究结果表明印支地块思茅地区自始新世以来相对于华南板块向南滑移量约500 km。

关键词: 印度支那地块, 古近纪, 地块运动, 古地磁, 磁倾角偏低

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

中图分类号: 

  • P618.81
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