| Methane-derived authigenic carbonates from the Ulleung basin sediments, East Sea of Korea | |
| Lim, Dhongil1; Choi, Jinyong2; Xu, Zhaokai2,3; Kim, Moonkoo1; Choi, Donglim1; Jung, Hoisoo4; Lee, Panmook5 | |
| 2009-06-30 | |
| 发表期刊 | CONTINENTAL SHELF RESEARCH
 |
| ISSN | 0278-4343 |
| 卷号 | 29期号:13页码:1588-1596 |
| 文章类型 | Article |
| 摘要 | Authigenic carbonates were sampled in methane-enriched piston core sediments collected from gas venting sites on the western continental slope of the Ulleung Basin, East Sea of Korea. Multidisciplinary investigations on these carbonates, including the scanning electronic microscope (SEM) observations and mineralogical-geochemical compositions, were carried out to identify the carbon and oxygen sources and the forming mechanism of these carbonates. The authigenic carbonates from the study area correspond to semi-consolidated, compact concretions or nodules ranging from 2 to 9 cm in size. X-ray diffraction and electron microprobe analyses showed that most of the sampled carbonate concretions were composed of almost purely authigenic high-Mg calcite (10.7-14.3 mol% MgCO(3)). Characteristically, microbial structures such as filaments and rods, which were probably associated with the authigenic minerals, were abundantly observed within the carbonate matrix. The carbonates were strongly depleted in delta(13)C (-33.85 parts per thousand to -39.53 parts per thousand Peedee Belemnite (PDB)) and were enriched in delta(18)O (5.16-5.60 parts per thousand PDB), indicating that the primary source of carbon is mainly derived from the anaerobic oxidation of methane. Such methane probably originated from the destabilization of the underlying gas hydrates as strongly supporting from the enriched (18)O levels. Furthermore, the strongly depleted delta(13)C values (-60.7 parts per thousand to -61.6 parts per thousand PDB) of the sediment void gases demonstrate that the majority of the gas venting at the Ulleung Basin is microbial methane by CO(2) reduction. This study provides another example for the formation mechanism of methane-derived authigenic carbonates associated with gas-hydrate decomposition in gas-seeping pockmark environments. (c) 2009 Elsevier Ltd. All rights reserved.; Authigenic carbonates were sampled in methane-enriched piston core sediments collected from gas venting sites on the western continental slope of the Ulleung Basin, East Sea of Korea. Multidisciplinary investigations on these carbonates, including the scanning electronic microscope (SEM) observations and mineralogical-geochemical compositions, were carried out to identify the carbon and oxygen sources and the forming mechanism of these carbonates. The authigenic carbonates from the study area correspond to semi-consolidated, compact concretions or nodules ranging from 2 to 9 cm in size. X-ray diffraction and electron microprobe analyses showed that most of the sampled carbonate concretions were composed of almost purely authigenic high-Mg calcite (10.7-14.3 mol% MgCO3). Characteristically, microbial structures such as filaments and rods, which were probably associated with the authigenic minerals, were abundantly observed within the carbonate matrix. The carbonates were strongly depleted in delta C-13 (-33.85 parts per thousand to -39.53 parts per thousand Peedee Belemnite (PDB)) and were enriched in delta O-18 (5.16-5.60 parts per thousand PDB), indicating that the primary source of carbon is mainly derived from the anaerobic oxidation of methane. Such methane probably originated from the destabilization of the underlying gas hydrates as strongly supporting from the enriched O-18 levels. Furthermore, the strongly depleted delta C-13 values (-60.7 parts per thousand to -61.6 parts per thousand PDB) of the sediment void gases demonstrate that the majority of the gas venting at the Ulleung Basin is microbial methane by CO2 reduction. This study provides another example for the formation mechanism of methane-derived authigenic carbonates associated with gas-hydrate decomposition in gas-seeping pockmark environments. (c) 2009 Elsevier Ltd. All rights reserved. |
| 关键词 | Authigenic Carbonates Methane Seep Environments Gas Hydrate East Sea (Japan Sea) |
| 学科领域 | Oceanography |
| DOI | 10.1016/j.csr.2009.04.013 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268434300004 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/3680 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Korea Ocean Res & Dev Inst, S Sea Inst, Jangmok Myun 656830, Geoje, South Korea 2.Kunsan Natl Univ, Dept Oceanog, Kunsan 573701, South Korea 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Korea Ocean Res & Dev Inst, Marine Geoenvironm & Resources Res Div, Seoul 425600, South Korea 5.Korea Ocean Res & Dev Inst, Marine & Ocean Engn Res Inst, Taejon 305343, South Korea |
| 推荐引用方式 GB/T 7714 | Lim, Dhongil,Choi, Jinyong,Xu, Zhaokai,et al. Methane-derived authigenic carbonates from the Ulleung basin sediments, East Sea of Korea[J]. CONTINENTAL SHELF RESEARCH,2009,29(13):1588-1596. |
| APA | Lim, Dhongil.,Choi, Jinyong.,Xu, Zhaokai.,Kim, Moonkoo.,Choi, Donglim.,...&Lee, Panmook.(2009).Methane-derived authigenic carbonates from the Ulleung basin sediments, East Sea of Korea.CONTINENTAL SHELF RESEARCH,29(13),1588-1596. |
| MLA | Lim, Dhongil,et al."Methane-derived authigenic carbonates from the Ulleung basin sediments, East Sea of Korea".CONTINENTAL SHELF RESEARCH 29.13(2009):1588-1596. |
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