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| DOI | 10.1016/j.orggeochem.2024.104739 |
| Archaeal lipid biomarkers in near-surface sediments at a giant colony of the bivalve Calyptogena: Molecular records of a massive methane release event associated with methane hydrate dissociation | |
| 发表日期 | 2024 |
| ISSN | 0146-6380 |
| EISSN | 1873-5290 |
| 起始页码 | 188 |
| 卷号 | 188 |
| 英文摘要 | To investigate the possibility that dissociation of subsurface methane hydrate (MH) in the eastern Nankai Trough, offshore of Japan, led to the formation of a giant colony of the bivalve Calyptogena (currently mostly dead), the carbon isotope ratios (813C) of archaeal lipids and methane were measured in near -surface core sediments at Daini-Tenryu Knoll. The irregular variation of porewater methane 813C with depth (from -75 %o to -26 %o) suggested that originally low 813C microbial methane was degraded in different proportions by anaerobic methane oxidation. Consistent with this inference, biomarkers of anaerobic methanotrophic archaea (ANME), namely, crocetane (2,6,11,15-tetramethylhexadecane), PMI (2,6,10,15,19-pentamethylicosane), and diethers (archaeol and hydroxyarchaeols), were detected in lipid extracts. The low diether 813C values (-121 %o to -104 %o) were characteristic of ANME, but less variable than the methane 813C values, and the relationships between diethers and methane 813C values deviated from regression lines derived using worldwide data from modern methane seep sites. In contrast, 813C values of the ANME source methane predicted from those regression lines and the diether 813C values agreed well with methane 813C values in MH samples obtained by nearby deep drilling. This result strongly suggests that most of the diethers were produced by ANME that proliferated during a past massive methane release event associated with MH dissociation. The crocetane 813C value, measured in a mixture with phytane and estimated from the correlation of the 813C of the mixture with the mole fraction of crocetane, was about -127 %o. More than half of the PMI 813C values were greater than -100 %o, suggesting the background presence of fossil PMI from methanogens. |
| 英文关键词 | Carbon isotope ratio; Methane; Crocetane; PMI; Archaeol; Hydroxyarchaeols; Anaerobic methanotrophic archaea; Methane hydrate; Calyptogena colony; Methane release event |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001169309500001 |
| 来源期刊 | ORGANIC GEOCHEMISTRY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/303075 |
| 作者单位 | National Institute of Advanced Industrial Science & Technology (AIST); Nagoya University; Tohoku University |
| 推荐引用方式 GB/T 7714 | . Archaeal lipid biomarkers in near-surface sediments at a giant colony of the bivalve Calyptogena: Molecular records of a massive methane release event associated with methane hydrate dissociation[J],2024,188. |
| APA | (2024).Archaeal lipid biomarkers in near-surface sediments at a giant colony of the bivalve Calyptogena: Molecular records of a massive methane release event associated with methane hydrate dissociation.ORGANIC GEOCHEMISTRY,188. |
| MLA | "Archaeal lipid biomarkers in near-surface sediments at a giant colony of the bivalve Calyptogena: Molecular records of a massive methane release event associated with methane hydrate dissociation".ORGANIC GEOCHEMISTRY 188(2024). |
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