Abstract
Geochemical studies of the U, Th, Ra, and40K in surface sediments of the China Sea and adjacent sea areas, the lower reaches of the Huanghe and Changjiang Rivers and the estuaries of the Zhujiang and Rongjiang Rivers were carried out with a model 8180-4K multichannel Ge(Li)γ spectrometer in 1981–1985. The mean values of U, Ra, Th,40K are about 2.11 ppm, 7.67×10−13g/g, 11.00 ppm, and 2.33 ppm respectively, in the China Sea, the Okinawa Trough, and the Changjiang and Huanghe River estuaries. The distribution of the four isotopes is uniform in the above zone.
The contents of U and Th in the sediments of the Zhujiang and Rongjiang Rivers and the Fujian coast are 1–4 times higher than those of the above zone and are related to the granite and radioactive ore present in the upper reaches of these rivers or the adjacent mountains.
The distributions of U, Th, Ra, and40K are related to the physico-chemical property, redox state, geological type and grain size of the sediment, and biotic activity.
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References
Chen Yuwei, Zhao Yiyang et al., 1982. Distribution characteristics of226Ra in sediments of the East China Sea and determination of sedimentation rate in near-shore region.Oceanologia et Limnologia Sinica 13(4): 380–387 (in Chinese with English abstract).
Cochran J. K., 1979. The geochemistry of226Ra and228Ra in marine deposits. Ph. D. Thesis, Yale University, New Haven, Conn., 1–50.
Li Peiquan, Liu Zhihe et al., 1983. Determinations of U, Ra, Th,40K and137Cs in the surface sediments in the off-shore area of western Bohai Sea with Ge(Li)γ spectrometer.Oceanologia et Limnologia Sinica 14(4): 333–341 (in Chinese with English abstract).
Li Peiquan, Liu Zhihe, Lu Guangshan and Su Xieming, 1984. The geochemical studies of U, Th, Ra, K (40K) in sediments of Okinawa Trough.Oceanologia et Limnologia Sinica 15(5): 457–467 (in Chinese with English abstract).
Liu Zhihe and Zhao Shuqian 1983. Measurement of137Cs,40K, U, Ra, Th in sediment with Ge(Li)γ spectrometer.Marine Sciences 1: 21–24 (in Chinese with English abstract).
Yokoyama, Y., and Huu-Van Nguyen, 1980. Direct and non-destructive dating of marine sediments manganese nodules, and corals by high resolution gamma-ray spectrometry.Uchida Rokakuho: 247–259.
Zhao Yiyang, 1983. Geochemistry of some elements in sediments of the East China Sea. Chin. J. Ocean. Limn.1(2): 210–222.
Zhao Yiyang, 1980. The geochemistry of Uranium in sediment in Bohai Bay, China.Geochemica 1: 101–105 (in Chinese).
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Contribution No. 1408, Institute of Oceanology, Academia Sinica, Qingdao.
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Peiquan, L., Zhihe, L. Geochemical studies of U, Th, Ra,40K in seciments of the China Sea and adjacent sea area, and lower reaches of several Chinese Rivers. Chin. J. Ocean. Limnol. 5, 109–117 (1987). https://doi.org/10.1007/BF02844995
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DOI: https://doi.org/10.1007/BF02844995