Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 158-169.doi: 10.13278/j.cnki.jjuese.20190035

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Geochemical and Carbon and Oxygen Isotope Records of Relative Sea-Level Change of Mufushan Formation in Early Cambrian in Nanjing, Lower Yangtze Region

Xu Zhongjie1, Kong Jintao1, Cheng Rihui1, Li Shuanglin2, Kong Yuan1, Yu Zhenfeng1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Natural Resources, Qingdao 266071, China
  • Received:2019-02-28 Published:2020-02-11
  • Supported by:
    Supported by National Natural Science Foundation of China (41872101),National Science Foundation for Young Scientists of China (41402087) and China Postdoctoral Science Foundation (2013M530976)

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Abstract: This research is to study the sedimentary environment and geochemical characteristics of the Early Cambrian Mufushan Formation in Nanjing area. The relative sea level rise and fall of the Mufushan Formation is analyzed by using element geochemistry, isotopic characteristics of carbon and oxygen, records of paleo-salinity, paleo-water depth, and paleo-environment. The Mg2+/Ca2+ values of the Mufushan Formation has a negative correlation with the paleo-bathymetry. The values of Sr/Ba, 1000Sr/Ca and V/Ni show positive correlation with the paleo-salinity and paleo-water depth. The curves of paleo-salinity and paleo-water depth reflected by the values of Sr/Ba, 1000Sr/Ca and V/Ni indicate the cyclicity of the sea-level changes. The oxygen and carbon isotopes of the Mufushan Formation samples retain the original marine isotope composition. The δ13CPDB values distribute between 0.8‰ and 3.5‰,with the mean of 2.55‰. The δ18OPDB values distribute between -6.9‰ and -2.2‰,with the mean of -4.18‰. The δ13CPDB values of the Mufushan Formation samples reflect the relative sea-level lift. Based on the values of Sr/Ba, 1000Sr/Ca, V/Ni,δ13CPDB and the evolution of the sedimentary environment, the curves of relative sea-level lift of the Mufushan Formation are drawn. The Mufushan Formation underwent a transgressive-regressive cycle. The relative sea-level lift curve shows that the sea-level fluctuated frequently in the Mufushan period. The fluctuation is composed by three relative sea-level rises and three declines.

Key words: Nanjing in lower Yangtze region, Early Cambrian, Mufushan Formation, geochemistry, oxygen and carbon isotope, sea-level changes

CLC Number: 

  • P59
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