Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 139-157.doi: 10.13278/j.cnki.jjuese.20180178

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REE Geochemistry and Indicators of Sedimentary Media of Limestone at Top of Xujiajuan Formation, Xiangshan Group in Ningxia Autonomous Region, China

Li Xiangdong1,2, He Youbin2   

  1. 1. School of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2. School of Geoscience, Yangtze University, Wuhan 430100, China
  • Received:2018-07-04 Published:2020-02-11
  • Supported by:
    Supported by National Natural Science Foundation of China (41272119, 41472096)

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Abstract: The thin-bedded limestone,at the top of Xujiajuan Formation of Xiangshan Group in Ningxia, the western of Ordos basin, has become the pivotal stratigraphic unit to solve the age controversy of Xiangshan Group for some critical fossils found in Xujiajuan Formation. There has been an age controversy since the 1940s when the group was discovered, which now seriously blocks the research such as Early Paleozoic tectonics, stratigraphy and paleogeography in the northern Qilian area. The authors discussed the aqueous media from which these thin-bedded limestones were deposited based on the data of rare earth elements (REEs) and other trace elements. The results show that:1) the thin-bedded limestone can be divided into three types of A, B and C according to their REEs characteristics. 2) the positive Eu anomalies and negative Ce anomalies increase and decrease from type A to type C, respectively. 3) the geochemical indices of limestone change regularly from type A to type C, including the decrease of (La/La*)N, (Y/Y*)N, (Gd/Gd*)N, and Y/Ho ratios, the increase of the concentration of total REE and the ratios of light REE to heavy REE, the first increase and then decrease of (La/Yb)N and (La/Sm)N values, the increase of (Ce/Ce*)N values relative to the decrease of U/Th ratios, and the stability of Sr/Ba ratios relative to the distinct increase of Zr/Rb ratios. These geochemical changes suggest that the water media from type A to type C during deposition were characterized by:1)the attributes of seawater was decreased while the influence of terrigenous origin increased. 2)the depositional hydrodynamic intensity increased distinctively with variation of water depth. 3)the redox condition was from reduction to oxidation, and the water salinity was stable. Based on these interpretations of sedimentary aqueous media (seawater), sedimentary environments, and the significant positive Eu anomalies, the deposition of thin-bedded limestones perhaps occurred in an anoxic zone near the boundary of redox-stratified ocean and the internal-waves and internal-tides influenced by the sea floor hydrothermal plumes, which probably controlled the input of terrigenous material and the redox conditions, causing hydrodynamic oxygenation on the anoxic background.

Key words: rare earth elements, hydrothermal plumes, limestone, Xujiajuan Formation, Xiangshan Group, western of Ordos basin

CLC Number: 

  • P512.2
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