Anaerobic oxidation of methane and greigite formation: Evidence of isotopically heavy pyrite in Pleistocene coastal sediments from the South Yellow Sea
文献类型：期刊论文
| 作者 | Yu, Xiaoxiao2; Mei, Xi1; Liu, Jianxing4; Duan, Baichuan4; Zhang, Rui3; Li, Tiegang4; Wei, Gangjian2; Lin, Mang2 |
| 刊名 | GLOBAL AND PLANETARY CHANGE
 |
| 出版日期 | 2024-09-01 |
| 卷号 | 240页码:18 |
| 关键词 | Ferromagnetic iron sulfide Pyrite sulfur isotope Microbial sulfate reduction Ferrous iron Sulfur cycle |
| ISSN号 | 0921-8181 |
| DOI | 10.1016/j.gloplacha.2024.104530 |
| 英文摘要 | Diagenetic alteration of magnetic minerals, driven by closely linked C-S-Fe cycles, is highly likely to complicate the paleomagnetic record. In addition to the anomalous diagenetic paleomagnetic signatures caused by ferromagnetic greigite growth, pyrite sulfur isotope compositions are often "heavy" (i.e., delta(34)Spyr > 0). However, the dependencies and mechanistic origins of these signatures remain controversial. This study presents a highresolution delta(34)Spyr record of a long sediment core collected from the South Yellow Sea, China. Ferromagnetic greigite is prominently identified in two coastal deposits within this core. The delta(34)Spyr values of these coastal deposits are isotopically (super) heavy, ranging from -10.6 to 22.8%o and from -14.5 to 26.5%o, with mean and 1 sigma values of 5.9 +/- 10.3%o (n = 15) and 12.2 +/- 9.8%o (n = 33), respectively. Additionally, magnetic parameters show positive trends with delta(34)Spyr values throughout the sediment core. These positive trends, along with the enrichment of ferrous iron and sedimentary microtextural evidence of the authigenic growth sequence of framboidal pyrite, siderite, euhedral pyrite, and greigite, indicate that anaerobic oxidation of methane (AOM) is a fundamental factor for ferromagnetic greigite formation in coastal sediments with sulfate limitation. We estimate the delay time of greigite formation relative to the depositional age of surrounding sediments to be a few hundred years due to the rapid sedimentation rates and shallow burial depths of the sulfate-methane transition zone (SMTZ) in coastal deposits. Conversely, the deep burial of SMTZ likely suggests that a longer delay time is prevailing for greigite formation in hemipelagic sediments. This study highlights the role of AOM in controlling the formations of greigite and coeval (super) heavy pyrite. |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001286237900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78681]  |
| 专题 | 中国科学院广州地球化学研究所 |
| 通讯作者 | Yu, Xiaoxiao; Mei, Xi |
| 作者单位 | 1.Qingdao Marine Sci & Technol Ctr, Qingdao Inst Marine Geol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 2.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 3.Jiangsu Ocean Univ, Coinnovat Ctr Jiangsu Marine Bioind Technol, Lianyungang 222005, Peoples R China 4.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Xiaoxiao,Mei, Xi,Liu, Jianxing,et al. Anaerobic oxidation of methane and greigite formation: Evidence of isotopically heavy pyrite in Pleistocene coastal sediments from the South Yellow Sea[J]. GLOBAL AND PLANETARY CHANGE,2024,240:18. |
| APA | Yu, Xiaoxiao.,Mei, Xi.,Liu, Jianxing.,Duan, Baichuan.,Zhang, Rui.,...&Lin, Mang.(2024).Anaerobic oxidation of methane and greigite formation: Evidence of isotopically heavy pyrite in Pleistocene coastal sediments from the South Yellow Sea.GLOBAL AND PLANETARY CHANGE,240,18. |
| MLA | Yu, Xiaoxiao,et al."Anaerobic oxidation of methane and greigite formation: Evidence of isotopically heavy pyrite in Pleistocene coastal sediments from the South Yellow Sea".GLOBAL AND PLANETARY CHANGE 240(2024):18. |
入库方式： OAI收割
来源：广州地球化学研究所
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