Variability of organic carbon isotope and C/N in the Hemudu Area, Hangzhou Bay and its environmental implications in the Holocene
- Авторы: Liu R.1,2, Zheng H.3
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Учреждения:
- School of Earth Sciences and Engineering
- Laboratory for Marine Mineral Resources
- School of Resource, Environment and Earth Science
- Выпуск: Том 55, № 12 (2017)
- Страницы: 1154-1163
- Раздел: Article
- URL: https://journals.rcsi.science/0016-7029/article/view/155669
- DOI: https://doi.org/10.1134/S001670291714004X
- ID: 155669
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Аннотация
With the purpose of tracing the variations of the organic matter sources of sediments, a sample column (25.96 m in size) from the Hemudu Area of Hangzhou Bay was put through AMS14C dating and biogeochemical analysis. TOC and TN presented similar variation trends, suggesting the same and stable sources of organic matter; the bad correlation between the grain size and TOC content indicated that the organic matter occurrence was neither controlled by the grain size nor the surface absorption of the fine particles, but it may has something to do with the complicated sedimentary hydrodynamic force, the input of organic matter and microbial action. Judging on the basis of C/N ratio and δ13CTOC, the organic carbon in sediments was a mixture of terrigenous and marine organic carbon, testifying to the land-sea interaction characteristic of the study area. The indexes experienced abrupt changes at about 6.5 ka BP, when the lighter terrigenous organic carbon made an increased proportion to the heavier marine organic carbon. The phenomenon reflected the enclosure of the lagoon and the reduced exchange interactions with the seawater of open seas.
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Об авторах
Rui Liu
School of Earth Sciences and Engineering; Laboratory for Marine Mineral Resources
Автор, ответственный за переписку.
Email: rachel_lr@163.com
Китай, Nanjing, 210046; Qingdao, 266071
Hongbo Zheng
School of Resource, Environment and Earth Science
Email: rachel_lr@163.com
Китай, Kunming, 650091
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