EGU23-4774
https://doi.org/10.5194/egusphere-egu23-4774
EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

New ca.1150 Ma paleomagnetic results of North China Craton (NCC) its paleogeographic and tectonic implications

Jikai Ding1,2, Shihong Zhang1, David Evans2, Hanqing Zhao1, Haiyan Li1, Tianshui Yang1, Huaichun Wu1, and Meinan Shi1
Jikai Ding et al.
  • 1School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing, China (shzhang@cugb.edu.cn)
  • 2Department of Earth & Planetary Sciences, Yale University, New Haven, USA

A new paleomagnetic study is carried out on the ca. 1150 Ma mafic dykes from the North China Craton (NCC). After stepwise thermal demagnetization, most samples yielded two components. The low-temperature component directs north and down with intermediate inclination, which is interpreted as a viscous remanent magnetization of the present magnetic field. The high-temperature component (HC) directs east and down with steep inclination. Positive baked-contact tests and a reversal test suggest the HC is primary. Combined with the relevant paleomagnetic data previously published (Hou et al., 2009; Wang et al., 2020), a new pole is calculated from more than thirty high-quality virtual geomagnetic poles. The pole has averaged out the paleo-secular variation and is different from any younger paleomagnetic poles of the NCC. The pole places the NCC in a mid-latitude region. Combined with the reported 1230-780 Ma paleomagnetic poles from NCC and Laurentia, the new results suggest the two continents assembled during ca. 1150–1110 Ma at high-latitude region. They then together moved to low-latitude region and merged with Amazonia, Baltica, Kalahari to become a part of Rodinia.

How to cite: Ding, J., Zhang, S., Evans, D., Zhao, H., Li, H., Yang, T., Wu, H., and Shi, M.: New ca.1150 Ma paleomagnetic results of North China Craton (NCC) its paleogeographic and tectonic implications, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-4774, https://doi.org/10.5194/egusphere-egu23-4774, 2023.