[张贴报告]Composition and radiocarbon ages of organic fractions preserved in South China Sea sediment

Composition and radiocarbon ages of organic fractions preserved in South China Sea sediment
编号:3943 稿件编号:1488 访问权限:私有 更新:2023-04-21 00:49:56 浏览:261次 张贴报告

报告开始:2023年05月07日 08:45 (Asia/Shanghai)

报告时间:1min

所在会议:[SP] 张贴报告专场 » [SP-6-1] 6、海洋地球科学

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摘要
Organic matter (OM) preservation in marine sediments is an important sink in the carbon cycle and provides useful information on the sources, biodegradation, and transformation of organic carbon during early diagenesis. Here, we present the first radiocarbon data set combined with stable carbon isotope measurements of total organic carbon (TOC) and four organic fractions, namely, total lipids, hydrolysable amino acids (THAAs), humic acids (HAs), and acid-base insoluble OM, separated from four sediment cores collected from the northern South China Sea (SCS). The total lipids, THAAs, HAs and acid-base insoluble OM fractions accounted for 1.1±0.4%, 3.1±1.6%, 12.7±9.4% and 61.6±10.0% of the TOC, respectively, and the acid-base insoluble OM was the dominant fraction of TOC preserved in the sediments. Distinct differences in both 13C and 14C values were found among these organic fractions. The δ13C values are more depleted in total lipids and HAs (-23.1‰ to -30.2‰) than in THAAs and the acid-base insoluble OM (-15.3‰ to -20.6‰), which indicates that HAs may be polymerized from lipid-like materials. The acid-base insoluble OM has the lowest Δ14C values (-848‰ to -358‰), with the oldest 14C ages (mean of 7330 years) compared to total lipids (-574‰ to -253‰, 3860 years), THAAs (-331‰ to -66‰, 1527 years) and HAs (-569‰ to -168‰, 2916 years) in these sediment cores. These results revealed that OM derived from marine and terrestrial sources decomposed selectively and contributed differently to the organic fractions during early diagenesis and preservation in marine sediment. The very aged acid-base insoluble fraction was likely formed as a complex of the most refractory OM during microbial degradation and alteration of TOC and represents a major mechanism of OM sequestration in marine sediments.
 
关键字
14C,lipids,Humic acids
报告人
王福强
崂山实验室

稿件作者
王福强 崂山实验室
王旭晨 中国海洋大学
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