Paleoenvironmental implications of the guano phosphatic cementation on Dongdao Island in the South China Sea |
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| Authors: | Xiao-Dong Liu Li-Guang Sun Zhong-Qi Cheng San-Ping Zhao Ke-Xin Liu Xiao-Hong Wu Zhou-Qing Xie Xue-Bin Yin Hong-Hao Luo Xing-Fang Ding Dong-Bo Fu Yu-Hong Wang |
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| Institution: | 1. CNRS UMR 5276, Ecole Normale Supérieure de Lyon, 46 Allée d''Italie, 69364 Lyon, France;2. Université de Lyon, Ecole Normale Supérieure de Lyon, 46 Allée d''Italie, 69364 Lyon, France;3. Tharsis-Energy, Ecole Normale Supérieure de Lyon, 46 Allée d''Italie, 69364 Lyon, France;1. Department of Mechanics, Islamshahr branch, Islamic Azad University (IAU), Tehran, Iran;2. Iranian Research Organization for Science and Technology (IROST), Tehran, Iran;1. LGM-LAB-MA05, ENIM, Université de Monastir, 5019 Monastir, Tunisia;2. LMN-LAB-EA2540, Université d''Evry Val d''Essonne, 91000 Evry, France;3. LAMBE, UMR8587, Université d''Evry Val d''Essonne 91025F, Evry cedex, France;4. Institut d''électronique fondamentale, Université de Paris-Sud, 91405 Orsay, France |
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| Abstract: | 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 isotope results further revealed that meteoric water were involved in these processes. AMS 14C dates on the brown phosphate cements indicate that they were formed around 5700, 5000–5100 and 2900 yr BP, respectively. The multi-episodes of phosphatization very likely correspond to intermittent seabird occupation on this island — possibly reflecting Holocene sea-level oscillation and/or long term climate changes in the South China Sea that have controlled seabird habitat. The phosphate cementation, which occurs widely in tropical islands, may be another useful monitor for sea-level and/or paleoclimate changes. |
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