Chinese Science Bulletin

, Volume 55, Issue 29, pp 3312–3323

SHRIMP U-Pb dating for a K-bentonite bed in the Tieling Formation, North China

Authors

    • School of Earth Sciences and ResourcesChina University of Geosciences (Beijing)
  • HuaiKun Li
    • Tianjin Institute of Geology and Mineral ResourcesChina Geological Survey
  • W. D. Huff
    • Department of GeologyUniversity of Cincinnati
  • F. R. Ettensohn
    • Department of Earth and Environment SciencesUniversity of Kentucky
  • ShiHong Zhang
    • School of Earth Sciences and ResourcesChina University of Geosciences (Beijing)
  • HongYing Zhou
    • Tianjin Institute of Geology and Mineral ResourcesChina Geological Survey
  • YuSheng Wan
    • Beijing SHRIMP Center, Institute of GeologyChinese Academy of Geological Sciences
Article Geochemistry

DOI: 10.1007/s11434-010-4007-5

Cite this article as:
Su, W., Li, H., Huff, W.D. et al. Chin. Sci. Bull. (2010) 55: 3312. doi:10.1007/s11434-010-4007-5

Abstract

A SHRIMP U-Pb zircon age of 1437±21 Ma was obtained for a recently discovered K-bentonite bed in the Tieling Formation, situated northeast of Beijing at the boundary between Liaoning and Hebei provinces, on the northern margin of the North China Craton (NCC). The SHRIMP U-Pb age places Tieling Formation near the end of the Calymmian Period of the early Mesoproterozoic Era. In addition, a SHRIMP U-Pb zircon date of 1372±18 Ma was acquired for K-bentonite beds in the overlying, dark-shale-dominated Xiamaling Formation from the same location northeast of Beijing. This date assigns a similar Mid-Mesoproterozoic (Ectasian Period) age for the Xiamaling Formation, as have previously determined dates from other sections northwest of Beijing. These dates indicate that the Tieling and Xiamaling formations, as well as the related succession in the eastern part of the Yanshan Mountains, represented by the well-known Meso- to Neoproterozoic standard section in Jixian, can be correlated well with sections northwest of Beijing in the western part of the Yanshan Mountains. In other words, the boundary between the Calymmian and Ectasian periods in the northern parts of the NCC is marked by the unconformity between the Tieling and Xiamaling formations in the northern NCC. This boundary was previously ascribed to the “Qinyu Orogeny” and thought to be of Grenville age. In this regard, the conventional “Qinyu Orogeny” should now be regarded as a short-lived regional uplift during Early Mesoproterozoic time, rather than a result from the Grenvillian assembly of the NCC to the Rodinia Supercontinent (∼1.0 Ga).

Keywords

zircon U-Pb ageK-bentoniteTieling FormationNorth China CratonCalymmian PeriodMesoproterozoic
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© Science China Press and Springer-Verlag Berlin Heidelberg 2010