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对南海东沙海域九龙甲烷礁冷泉碳酸盐岩的藿烷酸系列化合物进行了研究,结果显示冷泉碳酸盐岩中含有17β(H),21β(H)-30-藿烷酸至17β(H),21β(H)-33-藿烷酸系列化合物.其中site1样品TVG3-C2(ANME-2古菌种群为主)中的17β(H),21β(H)-32-藿烷酸化合物亏损13 C(-69.8‰),且其同位素值较接近iso-/aiso-C15∶0脂肪酸(-75.2‰~-90.0‰),说明其母质摄入了甲烷来源的碳.尽管site2(TVG13-C3和TVG14-C2)和site3(TVG8-C5)自生碳酸盐岩中藿烷酸化合物都表现出了非渗漏特征(-30.7‰~-40.3‰,ANME-1古菌种群为主),但这些样品中藿烷酸的δ13 C值同样较接近硫酸盐还原菌来源的iso-/anteiso-C15∶0的δ13 C值(-32.5‰~-49.8‰).由此说明大多数存在于以ANME-1种群为主的渗漏环境中的硫酸盐还原菌并没有参与到甲烷厌氧氧化作用中,而导致藿烷酸化合物和硫酸盐还原菌来源的生物标志物并不明显亏损13 C,并且δ13 C值相近.
The results showed that there are 17β (H), 21β (H) -30-hopoic acid in the cold spring carbonate and 17β (H ), 21β (H) -33-hopoic acid series compounds, wherein 17β (H), 21β (H) -32-hopoic acid compounds in the site1 sample TVG3-C2 (predominantly ANME- Loss of 13 C (-69.8 ‰), and its isotopic values closer to the iso- / aiso-C15:0 fatty acids (-75.2 ‰ ~ -90.0 ‰), indicating that their parent material intake of methane-derived carbon Although site2 (TVG13- Non-leakage characteristics (-30.7 ‰ ~ -40.3 ‰, mainly ANME-1 archaeal population) were found for all of the hopanes in the carbonate rocks of C3 and TVG14-C2 and T3G (TVG8-C5) , But δ13C value of the hopane acid in these samples was also closer to the δ13C value (-32.5 ‰ ~ -49.8 ‰) of iso- / anteiso-C15: 0 derived from sulfate-reducing bacteria, indicating that most of the Sulfate-reducing bacteria in a leakage environment dominated by ANME-1 did not participate in the anaerobic oxidation of methane, resulting in no significant loss of biomarkers from either hopnic acid compounds and sulfate-reducing bacteria 13 C , And the δ13 C values are similar.