| Logatchev热液场附近表层沉积物中有机质的组成特征、来源及其影响因素 |
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| 引用本文： | 杨伟芳,杨群慧,潘安阳.Logatchev热液场附近表层沉积物中有机质的组成特征、来源及其影响因素[J].海洋学研究,2011,29(1):9-16. |
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| 作者姓名： | 杨伟芳 杨群慧 潘安阳 |
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| 作者单位： | 中国科学院广州地球化学研究所;中国科学院研究生院;同济大学海洋地质国家重点实验室; |
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| 基金项目： | 国际海底区域研究开发“十一五”资助项目(DYXM-115-02-4-04) |
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| 摘 要： | 利用2005年"大洋一号"科学考察船电视抓斗采样器采集的表层沉积物样品,对大西洋洋中脊Logatchev热液场附近7个站位表层沉积物样品中的烷烃组分进行了定量分析,并结合总有机碳(TOC)及C稳定同位素(δ13C值)分析,探讨了表层沉积物中有机质的组成及可能的来源和影响因素.结果表明:表层沉积物中正构烷烃组分以低碳数化...
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| 关 键 词： | Logatchev热液场 表层沉积物 总有机碳 烷烃 |
Characteristics of organic composition and source of organic matter in surface sediments near the Logatchev hydrothermal field |
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| YANG Wei-fang,YANG Qun-hui,PAN An-yang.Characteristics of organic composition and source of organic matter in surface sediments near the Logatchev hydrothermal field[J].Journal of Marine Sciences,2011,29(1):9-16. |
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| Authors: | YANG Wei-fang YANG Qun-hui PAN An-yang |
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| Institution: | YANG Wei-fang1,2,YANG Qun-hui1,3,PAN An-yang3(1.Guangzhou Institute of Geochemistry,Chinese Academy of Science,Guangzhou 510640,China,2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,3.State Key Lab of Marine Geology,Tongji University,Shanghai 200092,China) |
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| Abstract: | Surface sediments collected from the Logatchev hydrothermal field of Mid-Atlantic Ridge have been analyzed for element C of total organic matter(TOC),stable isotopes(δ13C) and alkanes.The compositions and distributions of alkanes are studied and the possible sources of the organic matter of the sediments have preliminary been discussed.The contents of total organic carbon vary from 0.12% to 0.30%.And δ13C ranges from-23.5‰ to-20.1‰.The contents of n-alkanes vary from 0.78×10-6 to 10.29×10-6.The carbon number ranges from nC11~nC31.The low carbon number compounds of n-alkanes of the sediments are the main compounds,and the contents of nC16 or nC18 in most samples and nC11 in some samples are relatively high.The Pr/Ph ratios are generally very low.Unresolved complex mixture(UCM) exists in almost every sample of studying area.The contents of total organic carbon of some samples near the hydrothermal vents may indicate the productivity of chemosynthetic-based communities.The contents of nC11 in some samples are relatively high may show that the organic matter have been influenced by thermal cracking.And UCM may indicate that the organic matter have been influenced by biodegradation and hydrothermal alteration.δ13C and the distribution of n-alkanes indicate that the bacteria are the main source of organic matter in the surface sediments from the Logatchev hydrothermal field of Mid-Atlantic Ridge.Phytoplankton and zooplankton also have some contribution to the source of organic matter while the contribution of terrestrial organic matter is minimal.The higher contents of Pr and Ph may be related to the archaebacteria of hydrothermal field. |
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| Keywords: | Logatchev hydrothermal field surface sediment total organic carbon alkanes |
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