Earth Science Frontiers ›› 2010, Vol. 17 ›› Issue (1): 229-237.

• Article • Previous Articles     Next Articles

 Isotopic evidences  for geodynamic environment and process of the East China Sea and its basin dynamic model.

  

  1. 1Key Laboratory of Marine Resources and Environmental Geology, Qingdao Institute of Marine Geology, Ministry of Land and Resources, Qingdao 266071, China
    2CAS Key laboratory of Marginal Sea Geology; Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China
    3Shanghai Marine Petroleum Bureau, Shanghai 200050, China
    4China University of Geosciences(Wuhan), Wuhan 430074, China
  • Online:2010-01-28 Published:2010-01-28

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Abstract:

 Basalt samples from two oil drills respectively in the west and east of the East China Sea continental shelf basin were studied for the analysis of the geodynamic environment and process of the basin. Textures and compositions of the basalt samples were known from their petrological, petrochemical, trace element and isotopic testing analyses, and based on this, we have calculated the depth and temperature for the magma origin. It was discovered from the analysis of mantle nature and deep process in the magma source area that the deep mantle fluxes reflected by SmNd, PbPb and NdPb isotopic system gave a transition nature from the Paleozoic to the Cenozoic, showed an evident affinity to Paleozoic mantle magma and consisted of both old and young mantle materials, indicating frequent mantle flux activities in deep crust of the study area. Also twoship refraction profiling survey of Project 863 was carried out in the sea basin, and with the help of geologicgeophysical interpretation results from the survey, a model for geodynamic formation of the basin was established.

Key words: East China Sea area, geodynamic environment and process, basalt nature, model for the basin formation

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