1. Faculty of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, PR China;
2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, PR China;
3. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77054, USA;
4. Shanghai Branch of CNOOC Ltd, Shanghai 200030, PR China;
5. Paleomagnetic Laboratory Fort Hoofddijk, Faculty of Geosciences, Utrecht University, Utrecht, CD 3584, The Netherlands