Abstract
Based upon analyses of grain-size, rare earth element (REE) compositions, elemental occurrence phases of REE, and U-series isotopic dating, the sediment characteristics and material sources of the study area were examined for the recently formed deep-sea clays in the eastern Philippine Sea. The analytical results are summarized as follows. (1) Low accumulation rate, poor sorting and roundness, and high contents of grains coarser than fine silt indicate relatively low sediment input, with localized material source without long distance transport. (2) The REE Contents are relatively high. Shale-normalized patterns of REE indicate weak enrichment in heavy REE (HREE), Ce-passive anomaly, and Eu-positive anomaly. (3) Elemental occurrence phases of REE between the sediments with and without crust are similar. REE mainly concentrate in residual phase and then in ferromanganese oxide phase. The light REE (LREE) enrichment, Ce-positive anomaly, and Eu-positive anomaly occur in residual phase. Ferromanganese oxide phase shows the characteristics of relatively high HREE content and Ce-passive anomaly. (4) There are differences in each above mentioned aspect between the sediments with and without ferromanganese crust. (5) Synthesizing the above characteristics and source discriminant analysis, the study sediments are deduced to mainly result from the alteration of local and nearby volcanic materials. Continental materials transported by wind and/or river (ocean) flows also have minor contributions.
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Supported by the Key Program of the National Natural Science Foundation of China (Grant No. 90411014), the National Major Basic Research and Development Project (Grant No. 2007CB815903), the National Natural Science Foundation of China (Grant Nos. 40576032 and 40506016), and the Brain Korea 21 Program (Modern Sedimentation on the Yellow and East China Sea) of Korea
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Xu, Z., Li, A., Jiang, F. et al. Geochemical character and material source of sediments in the eastern Philippine Sea. Chin. Sci. Bull. 53, 923–931 (2008). https://doi.org/10.1007/s11434-008-0118-7
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DOI: https://doi.org/10.1007/s11434-008-0118-7