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首页> 外文期刊>Journal of Asian earth sciences >Elemental and isotopic response of different carbon components to anaerobic oxidation of methane: A case study of marine sediments in the Shenhu region, northern South China Sea
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Elemental and isotopic response of different carbon components to anaerobic oxidation of methane: A case study of marine sediments in the Shenhu region, northern South China Sea

机译：不同碳成分对甲烷厌氧氧化的元素和同位素应答 - 以南海北部申湖地区海洋沉积物为例

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摘要

In the cold seep region, the carbonate rocks/nodules help to reveal the source of methane and gas-hydrate decomposition. Conventionally, authigenic carbonate rocks/nodules are great proxy of AOM, but it only forms under an intermediate methane flow rate. It is thus vital to explore another carbon component proxy of AOM. In this paper, we investigate different carbon component features from a 5.2 m-long sediment core (SH-CL52) in the Shenhu region. We constrain the location of SMTZ based on the natural remanent magnetization (NRM) characteristic, pyrite content, TS/TOC and sulfur isotope, after that we discuss carbon component's isotopic response to AOM. Pyrite increases in 300-360 and 440-480 cmbsf, negative (NRMAF60mT - NRMA(F80mT))/NRM values occurrence in 300-360 and 440-480 cmbsf, bulk-sediment delta S-34 values have positive excursion in 300-360 and 440-480 cmbsf and pyrite delta S-34 positive excursions appear in 300-360 and 440-480 cmbsf. All these reflect that at least two methane release events (MREs) are identified in 300-360 and 440-480 cmbsf in the core SH-CL52, respectively. In these zones, delta C-13(TC), delta C-13(TIC), delta C-13(FC) and delta C-13(FGC) variety is not discernable, but delta C-13(TOC) has positive excursions which are most likely interpreted to the relatively higher methanogenesis rate in SMTZs. Our results suggest that delta C-13(TOC) represents a potential proxy of SMTZ under high methane flux and shortduration condition.
机译：在寒冷的渗透区域中，碳酸盐岩/结节有助于揭示甲烷和天然气水合物分解的来源。传统上，Athigenic碳酸盐岩/结节是AOM的很大代理，但它仅在中间甲烷流速下形成。因此，探索AOM的另一个碳成分代理是至关重要的。在本文中，我们调查了申湖地区5.2米长的沉积物核心（SH-CL52）的不同碳成分特征。我们基于自然剩磁磁化（NRM）特征（NRM）特征，黄铁矿含量，TS / TOC和硫同位素来约束SMTZ的位置，之后我们讨论了碳成分对AOM的同位素反应。黄铁矿在300-360和440-480厘米CMBSF中增加，负（NRMAF60MT - NRMA（F80MT））/ NRM值发生在300-360和440-480厘米CMBSF中，散装曲率ΔS-34值在300-360中有正偏移440-480 CMBSF和黄铁矿三角洲S-34阳性偏移出现在300-360和440-480厘米CMBSF中。所有这些都反映了至少两个甲烷释放事件（MRE）分别在核心SH-CL52中在300-360和440-480cmbsf中鉴定。在这些区域中，Delta C-13（Tc），Delta C-13（TiC），Delta C-13（Fc）和Delta C-13（FGC）品种是不可辨的，但Delta C-13（TOC）具有阳性最有可能在SMTZ中解释为相对较高的甲烷率的偏移。我们的结果表明，Delta C-13（TOC）表示在高甲烷通量和缺水条件下SMTZ的潜在代理。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第2期|104577.1-104577.10|共10页
  • 作者

    Yang Xin; Sun Xiaoming; Li Dengfeng; Lin Zhiyong; Lu Yang; Liang Yukang; Zhang Yihao;

  • 作者单位

    Sun Yat Sen Univ Sch Marine Sci Guangzhou 510006 Peoples R China|Guangdong Prov Key Lab Marine Resources & Coastal Guangzhou 510006 Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangzhou 510006 Peoples R China|Guangdong Prov Key Lab Marine Resources & Coastal Guangzhou 510006 Peoples R China|Sun Yat Sen Univ Sch Earth Sci & Engn Guangzhou 510006 Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangzhou 510006 Peoples R China|Guangdong Prov Key Lab Marine Resources & Coastal Guangzhou 510006 Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangzhou 510006 Peoples R China|Guangdong Prov Key Lab Marine Resources & Coastal Guangzhou 510006 Peoples R China;

    Guangdong Prov Key Lab Marine Resources & Coastal Guangzhou 510006 Peoples R China|Sun Yat Sen Univ Sch Earth Sci & Engn Guangzhou 510006 Peoples R China;

    Sun Yat Sen Univ Sch Marine Sci Guangzhou 510006 Peoples R China;

    Guangdong Prov Key Lab Marine Resources & Coastal Guangzhou 510006 Peoples R China|Sun Yat Sen Univ Sch Earth Sci & Engn Guangzhou 510006 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Cold seep; Anaerobic oxidation of methane (AOM); Fine-grained carbonate; Carbon isotopes; Total organic carbon (TOC); South China Sea;

    机译：冷渗透;甲烷的厌氧氧化（AOM）;细粒碳酸盐;碳同位素;总有机碳（TOC）;南海;

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