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Ornithogenic sediments are ideal materials for studying past eco-environmental changes. We collected sediment cores from Xisha archipelago of the South China Sea. The relative ratios of source materials (plant, guano and coral sand) of such sediments from Guangjin, Jinqing, Jinyin and Ganquan Islands in the Xisha archipelago, were reconstructed by reflectance spectroscopy. The consistence between...
The phosphatic cement in the bioclastic sediment sequence on the northeastern shore of Dongdao Island in the South China Sea was studied and its paleoenvironmental implications discussed. Petrological characteristics and major, trace, REE element data unequivocally supported the notion that phosphatization was closely associated with avian guano decomposition and leaching, whereas carbon and oxygen...
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