南海北部海马冷泉区表层沉积物的AOM生物标志化合物特征及意义

吴一帆; 管红香; 许兰芳; 茅晟懿; 刘磊; 苏正; 刘丽华

doi:10.3799/dqkx.2021.202

Volume 47 Issue 8

Sep. 2022

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Article Navigation > Earth Science > 2022 > 47(8): 3005-3015

Wu Yifan, Guan Hongxiang, Xu Lanfang, Mao Shengyi, Liu Lei, Su Zheng, Liu Lihua, 2022. Characteristics and Significance of Biomarkers Related to AOM in Surface Sediments of the Haima Cold Seep in the Northern South China Sea. Earth Science, 47(8): 3005-3015. doi: 10.3799/dqkx.2021.202

Citation:

Wu Yifan, Guan Hongxiang, Xu Lanfang, Mao Shengyi, Liu Lei, Su Zheng, Liu Lihua, 2022. Characteristics and Significance of Biomarkers Related to AOM in Surface Sediments of the Haima Cold Seep in the Northern South China Sea. Earth Science, 47(8): 3005-3015. doi: 10.3799/dqkx.2021.202

Citation:

Wu Yifan, Guan Hongxiang, Xu Lanfang, Mao Shengyi, Liu Lei, Su Zheng, Liu Lihua, 2022. Characteristics and Significance of Biomarkers Related to AOM in Surface Sediments of the Haima Cold Seep in the Northern South China Sea. Earth Science, 47(8): 3005-3015. doi: 10.3799/dqkx.2021.202

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Characteristics and Significance of Biomarkers Related to AOM in Surface Sediments of the Haima Cold Seep in the Northern South China Sea

doi: 10.3799/dqkx.2021.202

Wu Yifan^{1, 3
,
,},
Guan Hongxiang^{2
,
,},
Xu Lanfang^{1, 3},
Mao Shengyi¹,
Liu Lei²,
Su Zheng¹,
Liu Lihua¹

1.
Guangzhou Institute of Energy Resources, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2021-11-03
Publish Date: 2022-09-25

Abstract

Abstract

In this study, two sediment core samples were collected from the tubeworms area (site ROV06) and mussel area (site HM101) of the Haima cold seep, northern South China Sea. We extracted the lipid biomarkers, analyzed the contents and stable carbon isotopic values to study the source of the organic matter in seabed surface sediments, the distribution of microbial communities and their response to the seep leakage intensity. Alarge amount of crocetane, PMI, archaeol and sn2⁃hydroxyarchaeol (sn2⁃OH⁃Ar) related to anaerobic methanotrophic archaea (ANME) and iso⁃C₁₅ and ai⁃C₁₅ fatty acids produced by sulfate⁃reducing bacteria (SRB) were detected. The extremely negative δ¹³C values of these lipid biomarkers (as low as -126‰ for archaea biomarkers and -89 ‰ for sulfate⁃reducing bacteria biomarkers) indicated that anaerobic oxidation methane (AOM) occurred in the sediments. Crocetane was detected in the sediments of both ROV06 and HM101 sites, and most of the ratio of sn2⁃OH⁃Ar/archaeol was higher than 1, while the ratio of ai⁃C₁₅/iso⁃C₁₅fattyacid was lower than 2, indicating dominated community of ANME⁃2/DSS consortium in both site and a strong methane leakage intensity. The surface sediment of ROV06 site contained crocetane, whereas the low ratio of sn2⁃OH⁃Ar/archaeol(less than 1) and high ratio of ai⁃C₁₅/iso⁃C₁₅ fatty acid (> 2.1) indicated a mixed communities of ANME⁃1 /DSS and ANME⁃2 /DSS and the methane leakage intensity from bottom to surface of ROV06 station with a decreasing trend. The δ¹³C values of methane (-58‰~-53‰) were calculated based on the carbon isotopic fraction (Δ: -50‰) of ANME⁃2 and the mean δ¹³C values of the archaea biomarkers (PMI, archaeol, sn2⁃OH⁃Ar), indicating a mixture of thermogenic and biogenic source of methane. Methane at ROV06 and HM101 sites showed similar δ¹³C values, whereas the δ¹³C values of the biomarkers derived from SRB at ROV06 was lower than that at HM101 (Δδ¹³C: 18‰), which may be related to the absorption of sulfide and the release of sulfates by sulfur⁃oxidizing bacteria, a symbiotic bacterium of the tubeworms. The continuous release of sulfates was likely to greatly enhance AOM progress, resulting in more ¹³C⁃depleted inorganic carbon in the sediment.
- cold seep,
- tubeworm,
- mussels,
- anaerobic methane-oxidizing archaea,
- sulfate reducing bacteria,
- lipid biomarker,
- marine geology

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References(48)

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