| 北部湾涠洲岛海域沉积物中物质来源解析 |
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| 引用本文： | 林武辉,余锦萍,余克服,刘昕明,莫珍妮,宁秋云,李英花,李玉婷.北部湾涠洲岛海域沉积物中物质来源解析[J].沉积学报,2021,39(3):621-630. |
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| 作者姓名： | 林武辉 余锦萍 余克服 刘昕明 莫珍妮 宁秋云 李英花 李玉婷 |
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| 作者单位： | 1.广西大学海洋学院，南宁 530004 |
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| 基金项目： | 国家自然科学基金41906043广西自然科学基金2019GXNSFAA185006, 2017GXNSFBA198096 |
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| 摘 要： | 沉积物的物质来源问题是海洋沉积学所关注的关键问题。以北部湾涠洲岛海域的沉积柱样为例，在过剩210Pb法构建良好的年代框架基础上，利用元素、稳定同位素、放射性核素多种方法，解析沉积物中有机物和无机物的来源问题。结果显示:基于δ13C指标获得的沉积物中海源和陆源有机物的平均贡献比例分别为95.0%和5.0%；基于Al、Cu、40K、226Ra多种代用指标的端元混合模型计算沉积物中生物成因和碎屑成因的无机物平均贡献比例分别为64.1%和35.9%；而沉积物中Pb分布无法满足端元混合模型的结果，说明存在人类活动的可能影响。进一步构建沉积柱样中基于δ13C的陆源有机物和基于40K的生源无机物的贡献比例的年代变化趋势，发现该变化趋势与人类活动和气候变化（厄尔尼诺现象）密切相关。总之，利用元素、稳定同位素、放射性核素多种方法综合解析沉积物中物质来源问题，尝试探索多种物源识别的代用指标，为北部湾涠洲岛海域的生态环境管理提供一定的科学依据。
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| 关 键 词： | 物源来源 210Pbex定年 40K δ 13C 珊瑚礁 |
| 收稿时间： | 2020-04-09 |
Source Identification in A 210Pb-dated Sediment Core near Southwest Weizhou Island,Beibu Gulf:Evidence from Elements,Stable Isotopes,and Radionuclides |
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| LIN WuHui,YU JinPing,YU KeFu,LIU XinMing,MO ZhenNi,NING QiuYun,LI YingHua,LI YuTing.Source Identification in A 210Pb-dated Sediment Core near Southwest Weizhou Island,Beibu Gulf:Evidence from Elements,Stable Isotopes,and Radionuclides[J].Acta Sedimentologica Sinica,2021,39(3):621-630. |
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| Authors: | LIN WuHui YU JinPing YU KeFu LIU XinMing MO ZhenNi NING QiuYun LI YingHua LI YuTing |
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| Institution: | 1.School of Marine Sciences, Guangxi University, Nanning 530004, China2.Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China3.Guangxi Academy of Oceanography, Nanning 530022, China |
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| Abstract: | Sediment source is a key topic in marine sedimentology. In this study， sources of organic carbon and inorganic materials in a 210Pb-dated sediment core near southwest Weizhou Island， Beibu Gulf were studied using proxies for elements， stable isotopes， and radionuclides. The average contributions of marine and terrigenous organic carbon were 95.0% and 5.0% based on δ13C of total organic carbon （TOC） in the sediment core. Correspondingly， the mean contributions of biogenic and terrigenous inorganic materials in the sediment core were 64.1% and 35.9% based on multi-proxies of Al， Cu， 40K， and 226Ra. However， Pb in the sediment core could not be accounted for by the mixing of Pb in coral skeletons and crust， indicating that an additional contribution was derived from human activity. Historical contributions of δ13C-derived terrigenous organic carbon and 40K-derived biogenic inorganic material were constructed in the sediment core， indicating the impacts of human activity and climate change （El Nino）. Overall， multi-proxies of δ13C， Al， Cu， 40K， and 226Ra were explored for source identification in the core. Our results provide scientific basis for ecology and environment managements in the sea areas near Weizhou Island， Beibu Gulf. |
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