| 早期热河生物群时代的磁性地层学约束 |
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| 关键词:Jehol Biota North China Craton Dabeigou Formation Jurassic–Cretaceous boundary magnetostratigraphy |
| 基金项目:国家自然科学基金项目(编号: 41172177; 41725011);中国地质调查局地质调查项目(编号: DD20160207) |
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| Magnetostratigraphic Dating of the Early Jehol Biota |
| The early record of the Rehol Biota has been well preserved in the Mesozoic Dabeigou Formation and Dadianzi Formation. The magnetostratigraphic study can provide age control for the evolution of the Rehol Biota, the origin of birds, and the evolution of angiosperm. Meanwhile, it will offer chronological evidence for the terrestrial Jurassic–Cretaceous boundary in China, the Early Cretaceous division and global stratigraphic correlation. Additionally, it can also afford “deep-time” age control for the timing of destruction of the North China Craton. Based on magnetostratigraphic results from more than 1 100 oriented samples of the Luanping Basin, northern Hebei Province, the authors established a high-resolution magnetic polarity sequence of Dabeigou and Dadianzi Formations. By magnetostratigraphic correlation, the magnetic polarity sequence of the Dabeigou, Dadianzi and Xiguayuan Formations is correlated to M12–M9 in standard magnetic polarity time scale. The Dabeigou–Dadianzi Formation belongs to Mid-Valanginian–Mid-Hauterivian. The authors hold that the early age of the Rehol Biota is younger than the Early Cretaceous Valanginian Age. The studies conducted by the authors refute the stratigraphic subdivision that the terrestrial Jurassic–Cretaceous boundary in China would be set between the Dabeigou and the Dadianzi Formations. |
| PEI Jun-ling,YANG Zhen-yu,SUN Zhi-ming,TONG Ya-bo,CAI Yu-hang,WANG Xu-ri,ZHAO Yue.2019.Magnetostratigraphic Dating of the Early Jehol Biota[J].Acta Geoscientica Sinica,40(3):393-404. |
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