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Volume 42 Issue 6
Nov.  2023
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Article Navigation >  Bulletin of Geological Science and Technology  > 2023  >  42(6): 310-318
Wang Baofeng, Chen Xin, Jiang Nan, Wei Bitian, Zhang Weijie, Wu Ke, Xu Pengxiang, Zhou Yanan, Liu Yuchun, Wu Hanning. Rock magnetic properties of the Upper Silurian Longmu Co Upper Formation in the North Qiangtang Terrane[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 310-318. doi: 10.19509/j.cnki.dzkq.tb20220102
Citation: Wang Baofeng, Chen Xin, Jiang Nan, Wei Bitian, Zhang Weijie, Wu Ke, Xu Pengxiang, Zhou Yanan, Liu Yuchun, Wu Hanning. Rock magnetic properties of the Upper Silurian Longmu Co Upper Formation in the North Qiangtang Terrane[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 310-318. doi: 10.19509/j.cnki.dzkq.tb20220102
shu

Rock magnetic properties of the Upper Silurian Longmu Co Upper Formation in the North Qiangtang Terrane

doi: 10.19509/j.cnki.dzkq.tb20220102
  • 1.

    Department of Geology, Northwest University, Xi'an 710069, China

  • 2.

    Department of Ocean Science and Engineering, Centre for Marine Magnetism(CM2), Southern University of Science and Technology, Shenzhen Guangdong 518055, China

  • Received Date: 11 Mar 2022
  • Accepted Date: 17 Jun 2022
  • Rev Recd Date: 26 May 2022
    Abstract
  • Objective

    Palaeomagnetic study of the early Palaeozoic North Qiangtang Terrane can quantitatively constrain its palaeogeographic location since the Palaeozoic, which serves as an important foundation and key constraint for studying of the palaeotectonic pattern of the Qinghai-Tibet Plateau, the evolution of the Phanerozoic Tethys and palaeogeographic reconstruction.

    Methods

    Prior to palaeomagnetic study, it is essential to investigate the magnetic properties of rocks to identify the types and assemblages of magnetic carriers present in rocks, which will facilitate the selection of demagnetization experimental protocols and discussions on the primary nature of remanent magnetization. This paper focuses on the magnetic properties of limestone and sandstone from the Late Silurian Longmu Co Upper Formation in the North Qiangtang Terrane, through analyses of isothermal remanence acquisition curves, magnetic susceptibility with temperature(χ-T) curves, triaxial thermal demagnetization experiments, low-temperature magnetic properties tests, scanning electron microscopy (SEM) and energy dispersive spectral (EDS) analysis.

    Results

    Results show that magnetite is the predominant magnetic carrier in the limestone samples of the Longmu Co Upper Fm, with small amounts of pyrrhotite. The magnetic assemblage in the sandstone samples is more complex, dominated by magnetite, possibly with other magnetic minerals such as pyrrhotite.

    Conclusion

    Moreover, it demonstrates that stable high-temperature remanent magnetization components can be isolated from the limestone samples in the Longmu Co Upper Formation, making them suitable for further palaeomagnetic researches.

     

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