1. Department of Geology, University of Johannesburg, Johannesburg, South Africa
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
3. U.S. Geological Survey, Anchorage, AK, USA
4. Department of Earth Sciences, Dartmouth College, Hanover, NH, USA
5. Center for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China
6. CNRS, Géosciences Rennes, University of Rennes, Rennes, France