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Geophysical Evidence of the Collisional Suture Zone in the Prydz Bay, East Antarctica
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  • Lei Fu,
  • Jingxue Guo,
  • Weisen Shen,
  • Xin Wang,
  • Xiaochun Liu,
  • Xiaofei Chen,
  • Xiangyun Hu
Lei Fu
China University of Geosciences (Wuhan)
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Jingxue Guo
Polar Research Institute of China
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Weisen Shen
Stony Brook University
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Xin Wang
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Xiaochun Liu
Institute of Geomechanics, Chinese Academy of Geological Sciences
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Xiaofei Chen
Southern University of Science and Technology
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Xiangyun Hu
China University of Geosciences (Wuhan)

Corresponding Author:[email protected]

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The location and origin of Neoproterozoic-Cambrian sutures provide keys to understand the formation and evolution of the supercontinent Gondwana. The Larsemann Hills is located near a major Neoproterozoic-Cambrian suture zone in the Prydz Belt, but has not been examined locally by comprehensive geophysical studies. In this study, we analyzed data collected from a 1-D joint seismic-MT array deployed during the 36th Chinese National Antarctic Research Expedition. We found that a sharp Moho discontinuity offset of 6-8 km shows up in the stacked image of teleseismic P-wave receiver function analysis; coinciding with the abrupt Moho offset, a near-vertical channel with (1) low resistivity extending to the uppermost mantle depths, and (2) a high crustal Poisson’s ratio in the crust is identified. These findings provide evidence for the determination of the location and collisional nature of the Prydz belt or a portion of it.
06 Sep 2023Submitted to ESS Open Archive
11 Sep 2023Published in ESS Open Archive