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| Citation: | Yan Huimei, Tian Xu, Xu Fangjian, Hu Bangqi, Yang Yaomin, Feng Jianwei, Li Anchun, Guo Chen, Liu Zhaoqing. Sediment provenance of offshore mud area of the eastern Hainan Island in South China Sea since the Mid-Holocene[J]. Haiyang Xuebao, 2016, 38(7): 97-106. doi: 10.3969/j.issn.0253-4193.2016.07.009
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The sediment provenances were discussed in this paper based on grain-size, Sr-Nd isotopes, major element (Al2O3, TFe2O3, K2O, MgO, Na2O, TiO2, CaO, P2O5, and MnO) and AMS14C dating for core X2, which was retrieved from the offshore mud area of the eastern Hainan Island in the South China Sea (SCS). Results showed that core X2 can be divided into two sedimentary strata units (unit A1 and unit A2). Compared with unit A1 (240-120 cm, 7.6-4.0 ka BP), sediment mean grain size in unit A2 (120-0 cm, 4.0-0 ka BP) became coarser and the content of major elements decreased. In addition to the abnormal value, the trends of 87Sr/ 86Sr and εNd in core X2 were relatively stable. The sediments of core X2 were mainly derived from Hainan and Taiwan islands, and partly Pearl River. The sediments in unit A1 were primarily a mixture of Hainan and Taiwan islands. In unit A2, the sediments were mainly from Hainan Island, and partly Pearl River. The results suggested that the contribution of world-class river (i.e., the Pearl River) to the continental shelf of the northern SCS may be overestimated, while the influence of small rivers (i.e., Taiwan and Hainan islands) may be underestimated in the previous studies. Therefore, more attention should be paid to the contribution of small rivers to the continental shelf area in the future studies.
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