Sedimentation rate and its impact factors revealed through a pushcore at the bottom of the Sansha Yongle Blue Hole

Li Jiankun; Li Tiegang; Feng Aiping; Du Jun; Zou Xinqing; Liu Shihao; Yu Xiaoxiao; Duan Baichuan

doi:10.3969/j.issn.0253-4193.2019.05.010

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Li Jiankun, Li Tiegang, Feng Aiping, Du Jun, Zou Xinqing, Liu Shihao, Yu Xiaoxiao, Duan Baichuan. Sedimentation rate and its impact factors revealed through a pushcore at the bottom of the Sansha Yongle Blue Hole[J]. Haiyang Xuebao, 2019, 41(5): 107-117. doi: 10.3969/j.issn.0253-4193.2019.05.010

Citation:

Li Jiankun, Li Tiegang, Feng Aiping, Du Jun, Zou Xinqing, Liu Shihao, Yu Xiaoxiao, Duan Baichuan. Sedimentation rate and its impact factors revealed through a pushcore at the bottom of the Sansha Yongle Blue Hole[J]. Haiyang Xuebao, 2019, 41(5): 107-117. doi: 10.3969/j.issn.0253-4193.2019.05.010

Citation:

Li Jiankun, Li Tiegang, Feng Aiping, Du Jun, Zou Xinqing, Liu Shihao, Yu Xiaoxiao, Duan Baichuan. Sedimentation rate and its impact factors revealed through a pushcore at the bottom of the Sansha Yongle Blue Hole[J]. Haiyang Xuebao, 2019, 41(5): 107-117. doi: 10.3969/j.issn.0253-4193.2019.05.010

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Sedimentation rate and its impact factors revealed through a pushcore at the bottom of the Sansha Yongle Blue Hole

doi: 10.3969/j.issn.0253-4193.2019.05.010

1.
Key Laboratory of Coast and Island Development, Ministry of Education, Nanjing University, Nanjing 210023, China;First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
3.
Pingtan Comprehensive Pilot Zone, Island Research Center, Ministry of Natural Resources, Pingtan 350400, China
4.
Key Laboratory of Coast and Island Development, Ministry of Education, Nanjing University, Nanjing 210023, China;Collaborative Innovation Center of South China Sea Studies, Nanjing University, Nanjing 210023, China

Received Date: 2018-05-21

Abstract

Abstract

Sansha Yongle Blue Hole (SYBH), known as the deepest blue hole worldwide, is located in the Xisha Yongle Atoll. Due to its comparatively quiescent internal environment, SYBH has been set as a natural laboratory for understanding how different factors impact the sedimentation rate changes. The grain sizes analyses of a 24 cm long pushcore collected at the bottom of SYBH reveals that the sediments there are primarily consisted of sand with mean grain sizes varying from 22.9 to 123.9 μm. Meanwhile significant grain size coarsening is observed 0 cm, 4 cm, 9.5 cm and 21 cm, in the pushcore. We adopte CRS model of ²¹⁰Pb and related analysis to calculate the age of the sediments, and find the oldest sediment was preserved in 1896, and the mean sedimentation rate is 0.19 cm/a. Sharp increases of the sedimentation rate is observed at 4 cm and 9.5 cm. We hypothesize that such increased sedimentation rate near the top pushcore, is a result of anthropogenic influences that happened in the Xisha district within the past few years. Analysis of historical typhoon records near our study area indicates six of typhoon events presumably contribute to the grain size variation in the SYBH during 1999-2001 and 2010-2011, i.e., 199902, 199915, 200110, 201002 and 201118. Thus, we can conclude that the sedimentation rate of sediment at the bottom of SYBH is mainly affected by typhoon events and there is also anthropogenic influence recently.
- Yongle Blue Hole,
- sedimentation rate,
- ²¹⁰Pb,
- anthropogenic influence,
- typhoon event

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References(26)

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