The δ13C composition and genetic origin of a series straight long-chain alkyl naphthalene isomer pairs in the Upper Cretaceous lacustrine sediments of Songliao Basin, China
文献类型：期刊论文
| 作者 | Cao, Xinxing3; Li, Yan2; Song, Zhiguang1,3 |
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 2025-02-01 |
| 卷号 | 200页码:11 |
| 关键词 | Long-chain alkyl naphthalene isomer pairs (LANs) Carbon isotopic composition Genetic origin Cretaceous lacustrine shales Songliao Basin |
| ISSN号 | 0146-6380 |
| DOI | 10.1016/j.orggeochem.2024.104898 |
| 英文摘要 | A series of straight long-chain alkyl naphthalene isomer pairs (LANs) have been detected in the Upper Cretaceous lacustrine sediments of Nenjiang Formation (K2n1+2) in the Songliao Basin, and their distribution and carbon isotopic composition were investigated. The results indicate that the composition and distribution of LANs exhibit significant variations. The relative abundance of methyl- and dimethyl-naphthalenes shows a reciprocal correlation with that of LANs, increasing and declining in tandem. The delta 13C composition of LANs varies from -24.6 %o to -32.6 %o, with an average of -28.5 %o, which is notably higher than that of n-alkanes, ranging from -31.9 %o to -34.5 %o. The delta 13C composition of methylnaphthalenes (MNs) ranges from -26.9 %o to -27.1 %o, which is generally more positive than the average delta 13C composition of LANs. Analysis of the carbon isotopic composition of n-alkanes, methylnaphthalenes, and the series of LANs, along with their distribution patterns, suggests the presence of multiple formation mechanisms. Specifically, the observed declining variation pattern of delta 13C values for LANs along with the increasing carbon number of the alkyl chain may indicate a novel formation pathway. This pathway likely involves a direct reaction between 13C-enriched naphthalene and 13C-depleted straight long-alkyl chains during diagenesis. The relative abundance ratio of total methyl-substituted naphthalenes (Sigma MNs) to the total LANs (Sigma LANs), expressed as the Sigma MNs/Sigma LANs ratio, exhibits a profile variation that correlates with the profile changes of the Pr/Ph ratio, TOC content, and HI index. This correlation indicates that specific environmental conditions or source inputs, such as reduced sedimentary conditions or specific algal contributions, may be conducive to the formation of LANs. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001411275600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82624]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Li, Yan; Song, Zhiguang |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, Peoples R China 3.Nanning Normal Univ, Minist Educ, Key Lab Beibu Gulf Environm Change & Resources Uti, Nanning 530001, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cao, Xinxing,Li, Yan,Song, Zhiguang. The δ13C composition and genetic origin of a series straight long-chain alkyl naphthalene isomer pairs in the Upper Cretaceous lacustrine sediments of Songliao Basin, China[J]. ORGANIC GEOCHEMISTRY,2025,200:11. |
| APA | Cao, Xinxing,Li, Yan,&Song, Zhiguang.(2025).The δ13C composition and genetic origin of a series straight long-chain alkyl naphthalene isomer pairs in the Upper Cretaceous lacustrine sediments of Songliao Basin, China.ORGANIC GEOCHEMISTRY,200,11. |
| MLA | Cao, Xinxing,et al."The δ13C composition and genetic origin of a series straight long-chain alkyl naphthalene isomer pairs in the Upper Cretaceous lacustrine sediments of Songliao Basin, China".ORGANIC GEOCHEMISTRY 200(2025):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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