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| 1 | Studies on diffusion and profiles of elements in deep-sea manganese nodules显示文摘Elemental compositions are measured in manganese nodules collected from the Northern Mid-Pacific floor by inductively-coupled plasma atomic emission spectrometry (1CP-AES) and their growth rates are determined by radiometric methods. The result shows that depth distributions of elements in nodules vary with depth as follows; (i) increase, (ii) decrease and (iii) fluctuation. These internodule variations in elemental compositions are considered to be caused by diffusion and migration of elements in nodules and heterogeneities in textures of nodules. In the present paper, a diffusive model is used to elucidate the inward-increase profile of some elements in nodules. The effective diffusive coefficients are estimated to be of the order of 10-9 cm2/a for Ni, V and Zn in the nodules, which is less than the value reported for radionuclides. | Luo Shangde , Wang Lei and Huang Yipu Department of Oceanography, Xiamen University, Xiamen, China | 1989 | Acta Oceanologica Sinica1989，8，3： | 1 |
| 2 | Insitu radionuclide transport and preferential groundwater flows at INEEL(Idaho):Decay-series disequilibrium studies显示文摘 | Luo Shangde | 2000 | Geochimica et Cosmochimica Acta2000，64，5： | 1 |
| 3 | Insitu radionuclide transport and preferential groundwater flows at Ineel(Idaho) : decay-series disequilibrium studies显示文摘 | Luo Shangde | 2000 | Geoehimiea et Cosmochimica Aeta2000，64，5： | 1 |
| 4 | Radiochemical studies of deep - sea manganese nodules显示文摘Five manganese nodules collected from the Northern Mid - Pacific have been analysed for their U and Th isotopes.lt is found that the enrichment of thorium compared to uranium is universal in deep- sea manganese, nodules and in the top sides of the nodules there are large excesses of Th and Pa decreasing exponentially with depth. For each of the nodules, the concordant growth rates are obtained from three different methods: 230Thex 230Thex/232Th and 231Paex.The growth rates of manganese nodules are closely related to the chemical compositions of the nodules and the types of the underlying sediments. The growth rates of five nodules are determined to be in the range of 0.79-7.4 mm/106a, in agreement with those predicted from the chemical compositions of the nodules. By the comparison of the extrapolated 230Thex,230Thex/232 Th and 231PaeX data from the top and bottom surfaces of the nodule from Site M21 yields, the nodule turnover time is (9.83-13.7)×104a. | Huang Yipu, Luo Shangde, Shi Wenyuan Chen Zhen Department of Oceanography, Xiamen University, Xiamen , china | 1989 | Acta Oceanologica Sinica1989，8，2： | 1 |
| 5 | Age dating of lacustrine sediments in Lake Tianshuihai of the Tibetan Plateau by using U-series isochron method and its significance显示文摘The age of the clastic-clay sediments with varied content of carbonate in core TS95 taken from the Lake Tianshuihai in the northwest of the Tibetan Plateau was determined successfully by using the total sample dissolution U-series isochron method for the first time. With this method, the serial absolute timescale (isotope time scale) covered the last 240 ka in the main body of the Tibetan Plateau with a sea level up to 4000 m is also established for the first time, thereby laying the foundation for the research on the paleo-climate and palaeoenvironment in the Lake Tianshuihai region as well as the relationship between evolution of the Tibetan Plateau and global changes. In addition to a brief introduction of the basic principles, the procedures of experiments, and the results, this note also presents the adaptability and superiority of this method as well as its possible problems. | ZHU Zhaoyu KU Teh-Lung LUO Shangde ZHOU Houyun WEN Qizhong LI Shijie LI Bingyuan LI Hongchun | 2001 | Chinese Science Bulletin2001，46，10： | 0 |
| 6 | Characterization of radionuclide transport in subsurface environments using naturally- occurring uranium-series radioisotopes as an ananolog显示文摘 | Shangde LUO Teh-Lung Ku V. Todd M. T. Murrell J. A. RODRIGUEZ J. C. DINSMOOR A.J. MITCHELL | 2006 | Chinese Journal Of Geochemistry2006，25，B08： | 0 |
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