Stable carbon and nitrogen isotope variations in sedimentary organic matter in the Sea of Japan since 37 ka: Paleoceanographic implications

被引：0

作者：

Zouj J. ^{[1
,2
]}

Zong X. ^{[1
]}

Zhu A. ^{[1
]}

Dou R. ^{[1
]}

Lin J. ^{[1
]}

Feng X. ^{[1
]}

Dong Z. ^{[1
]}

Gorbarenko S.A. ^{[3
]}

Zheng L. ^{[4
]}

Shi X. ^{[1
,2
]}

机构：

[1] Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao

[2] Laboratory for Marine Geology, Pilot National Oceanography Laboratory for Marine Science and Technology ( Qjngdao ), Qingdao

[3] V.I. Il'ichev Pacific Oceanological Institute, Far East Branch of the Russian Academy of Sciences, Vladivostok

[4] State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou

来源：

Earth Science Frontiers | 2022年 / 29卷 / 04期

关键词：

last glacial period; sea level; Sea of Japan; sedimentary organic matter sources; stable carbon and nitrogen isotopes;

D O I：

10.13745/j.esf.sf.2022.1.6

中图分类号：

学科分类号：

摘要：

Stable carbon and nitrogen isotopes in sedimentary organic matter (δ13 C and δ15N) have been widely used in the organic matter source tracing and reconstruction of paleoproductivity and paleoenvironment. A pronounced feature of sedimentary 813 C and 815 N in the Sea of Japan is their synchronous negative excursions during the Last Glacial Maximum (LGM), yet the causes and mechanisms of this phenomenon are poorly understood. In this study, we investigated the evolutionary history of sedimentary d13C and δ15N since 37 ka in core LV53-23-1 retrieved from the Oki Ridge of the central Sea of Japan. According to the results, sedimentary δ13C and δ15N ranged from 26.3%o to 22.5%o and 1.6%o to 6.1%o, respectively, with the lower values coinciding with the deposition of dark laminated mud during the LGM (26.5-17 ka), indicating an increased contribution of terrestrial organic matter. Both δ13 C and δ15 N showed positive excursions during Heinrich Statidal 1 (17-14.5 ka), indicating distinct oceanic environmental changes in the Sea of Japan, which corresponds to the Tsushima Strait flooding and the Tsushima Warm Current invasion into the Sea of Japan at that time. After 14.5 ka sedimentary δ15N reached ∼5%o, comparable to the average δ15N of nitrate in sea water. We estimated the relative contributions of organic sources using a binary mixing model. The contribution of terrigenous organic matter ranged between 65% to 80% in the LGM, while marine source contributed between 60% to 80% since 14.5 ka. Besides, sedimentary δ15N depletion during the LGM can be caused by (1) improved nitrogen fixation in the surface water of the Sea of Japan due to higher dust-borne Fe supply, and (2) decreased effects of early diagenesis on sedimentary δ15N due to prevailing suboxic or anoxic environment. Taken together, the variations of sedimentary δ13C and δ15N in the Sea of Japan since 37 ka are controlled by eustatic sea level and global climate changes, which modulate the organic source, nutrient supply, primary productivity, and redox conditions in water column and sediment. © 2022 Science Frontiers editorial department. All rights reserved.

引用

页码：123 / 135

页数：12

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