Chemical and isotopic alteration of organic matter during early diagenesis:evidence from the coastal area offshore the Zhujiang Estuary in China

ZHANG Ling; CHEN Fan-rong; YANG Yong-qiang; ZHANG De-rong

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Article Navigation > Haiyang Xuebao > 2008 > 30(5): 43-51

ZHANG Ling, CHEN Fan-rong, YANG Yong-qiang, ZHANG De-rong. Chemical and isotopic alteration of organic matter during early diagenesis:evidence from the coastal area offshore the Zhujiang Estuary in China[J]. Haiyang Xuebao, 2008, 30(5): 43-51.

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Chemical and isotopic alteration of organic matter during early diagenesis:evidence from the coastal area offshore the Zhujiang Estuary in China

1.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Ciences, Guangzhou 510640, China

Received Date: 2006-12-26
Rev Recd Date: 2008-07-29

Abstract

Abstract

Under standing the chemical and isotopic alteration of organic matter duringearly diagenesis is crucial to the studies of biogeochemical processes in marine and lacustrine environments.The isotopic composition(δ¹³C and δ¹⁵N),total organic carbon(TOC)and total nitrogen(TN)contents of sediment cores as well as plankton and suspended particulates from the coastal area off shore the Zhujiang Estuary were determined,and the fractional carbon content of total hydrolysable amino acids(THAA),total carbo hydrates(TCHO),total lipid and acid-insoluble organic compounds(AIOC)and their respective δ¹³C were analyzed,based on which,the magnitude and mechanismof chemical and isotopic fractionation of organic matter were investigated.Results showed that the degradable fractions of THAA、TCHO and lipid decreased from plankt on to POM to surface sediments and to the buried sediments,and δ¹³C of TOC and organic fractions kept stable with depth,but differed distinctly among the four fractions.The different degradation rates oforganic compounds and the formation and degradation of bacteria organic matterare the major mechanisms causing the chemical and isotopic alteration oforganic matter duringearly diagenesis1 Because of the lower carbohydrate content in the plankton and the rapid degradation of lipid,the carbon isotopic fractionation caused by selective degradation of compounds could be relatively small and was partially canceled by the addition of bacterial synthesized organic matter,resultingin the observed conservative nature of δ¹³C duringearly diagenesis.On the other hand,the addition of bacteria organic matter may account for the depletion and variation of δ¹⁵N caused by early diagenesis.The above studies suggested that δ¹³C can be a reliable proxy to the sources of organic matter,but δ¹⁵N cannot be used to indicate the origin of sedimented o rganic matterin the study area.
- TOC,
- stable isotopic composition,
- early diagenesis,
- fractionation,
- bacteria activity,
- Zhujiang Estuary in China

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References(22)

References

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