Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 45, Issue 16, Pages 8425-8434Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018GL078904
Keywords
radiocarbon; lateral particle transport time; organic carbon aging; continental shelf sediments; grain size fractions
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Funding
- SNSFCAPS-LOCK project [200021_140850]
- National Natural Science Foundation of China [41520104009, 41521064]
- 111 project [B13030]
- JAMSTEC
- NIES
- JSPS [KAKENHI 25550020, 23651021, 22310014]
- MOE [Suishinhi B-0903, B-0904, 2-1304, A-1003]
- Grants-in-Aid for Scientific Research [23651021, 22310014] Funding Source: KAKEN
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Compound-specific radiocarbon analysis was performed on different grain-size fractions of surficial sediments to examine and compare lateral transport times (LTTs) of organic carbon. C-14 aging of long-chain leaf wax fatty acids along two dispersal pathways of fluvially derived material on adjacent continental margins implies LTTs over distances of similar to 30 to 500km that range from hundreds to thousands of years. The magnitude of aging differs among grain size fractions. Our finding suggests that LTTs vary both temporally and spatially as a function of the specific properties of different continental shelf settings. Observations suggest that C-14 aging is widespread during lateral transport over continental shelves, with hydrodynamic particle sorting inducing age variations among organic components residing in different grain sizes. Consideration of these phenomena is of importance for understanding carbon cycle processes and interpretation on sedimentary records on continental margins.
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