Studies on diagenetic change of chemical and isotopic compositions of marine organic matters during sedimentation.

海洋有机质沉积过程中化学和同位素组成的成岩变化研究。

• 批准号: 08454161
• 负责人: MINAGAWA Masao
• 金额: $ 5.12万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454161/
• 关键词: Marine organic matter; Land organic matter; Carbon-isotope; Nitrogen-isotope; Lignin; Marine Sediment; Suspended particle; Diagenetic process; 酸素同位体; 年代測定; 有孔虫; 炭酸カルシウム

Sedimentary organic matter and suspended organic particles were collected from the East China Sea, Japan Sea and Hidaka trough, and were analyzed for biomarkers such as stable carbon and nitrogen isotopes, lignin phenols and hydrocarbons. The ^<13>C and ^<15>N of suspended matter changed from -20 to -28*, and 4 to 10*, respectively during settling of particles from surface to deep layr, meaning that degradation of partculate organics in the deep layr might follow simultaneous isotopic fractionation due to preferencial decomposition of organic compounds or isotopic discrimination. In spite of such isotopic change along the water depth, it is emphasized that the particulate matter in themixing layr would play an important role to control isotopic composition of settling particles and surface sediment. We found that there is an isotopic shift among suspended matter, settling particle and surface sediment for both carbon and nitrogen. Our results showed that lignin phenol is basically useful proxy to evaluate cotribution of terrestrial organic matter into the marine sedimentary organic matter. However, it was concluded that lignin lambda which has been defined by Hedges and Mann (1979) would be infuluenced by local factors such as marine productivity so that the relationship between lambda and 8^<13>C (TOC) should be defined for each locations.

收集东海、日本海和飞高海槽沉积有机质和悬浮有机颗粒，分析其稳定碳、氮同位素、木质素酚类和碳氢化合物等生物标志物。颗粒沉降过程中，悬浮物的^<13>C和^<15>N分别在-20 ~ -28*和4 ~ 10*之间变化，说明深部颗粒有机物的降解可能由于有机物优先分解或同位素区分而发生同步同位素分异。尽管存在这种沿水深方向的同位素变化，但强调混合层中的颗粒物质对沉降颗粒和表层沉积物的同位素组成具有重要的控制作用。在悬浮物、沉降颗粒和表层沉积物中，碳、氮同位素均有明显的变化。结果表明，木质素酚是评价陆相有机质对海相沉积有机质贡献的基本指标。然而，得出的结论是，Hedges和Mann（1979）定义的木质素lambda会受到海洋生产力等当地因素的影响，因此lambda与8^<13>C （TOC）之间的关系应该为每个地点定义。

项目成果

南川 雅男: "安定同位体による水圏生態系構造の解明" 水環境学会誌. 20(5). 296-300 (1997)

Masao Minamikawa：“利用稳定同位素阐明水生生态系统结构”，日本水环境学会杂志 20(5) (1997)。

Minagawa, M.: "Application of stable isotope study to evaluate ecosytsem structure. (in Japanese)" Journal of Japan Society on waterEnvironment Society. 20. 296-300 (1997)

Minakawa, M.：“应用稳定同位素研究来评估生态系统结构。（日语）”日本水环境学会杂志。

南川雅男、川西伸明、高村章: "海洋粒状有機物の炭素窒素同位体組成の変動" 月刊「海洋」. 28. 712-716 (1996)

Masao Minamikawa、Nobuaki Kawanishi、Akira Takamura：“海洋颗粒有机物碳氮同位素组成的变化”《海洋月刊》28. 712-716 (1996)。

Wahyudi & Minagawa: "Response of benthic foraminifera to organic carbon accumulation rates in the Okinawa trough" Journal of Oceanography. 53(5). 411-420 (1997)

瓦尤迪

Wahyudi, and Minagawa, M.: "Response of benthic foraminifera to organic carbon accumulation rates in the Okinawa Trough." Journal of Oceanography. 53. 411-420 (1997)

Wahyudi 和 Minakawa, M.：“冲绳海槽底栖有孔虫对有机碳积累率的响应”。