Exploring Spatiotemporal Paleoenvironmental and Paleoceanographic Changes on the Continental Shelf Using Authigenic Greigite: A Case Study From the East China Sea

Liu, Jianxing1,2; Xu, Taoyu1,2; Zhang, Qiang3; Yu, Xiaoxiao4; Wu, Yonghua1,2; Liu, Qingsong2,5; Shi, Xuefa1,2

2023-06-01

10.1029/2023PA004621

PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY   影响因子和分区

2572-4517

2572-4525

The lack of suitable indicators of changes in such as sea-level and circulation has been a major limit to paleoenvironmental and paleoceanographic investigations in continental shelf regions. This paper presents an environmental magnetic study by comparing two late-Quaternary sediment cores (DH02 and DH03) from the outer shelf of the East China Sea (ECS). Late and early Marine Isotope Stage (MIS) 3 sediments were deposited in a prodelta under cold coastal currents and an open-shelf with the Taiwan Warm Current and upwelling. The dominant iron-bearing minerals of the late and early MIS 3 sediments are authigenic greigite (Fe3S4) and pyrite (FeS2), respectively, which were assumed to be formed nearly syndepositionally. The overlying sediments, however, are magnetically dominated by detrital magnetite. This pattern corresponds well to the temporal changes in sea-level over this period. The widespread occurrence of greigite in the late MIS 3 sediments can also be used for future stratigraphic division and correlation in the ECS. Additionally, compared to microfossil assemblages, rock magnetic parameters based on greigite may be more sensitive to environmental changes on continental shelves. Furthermore, the inter-borehole spatial comparisons imply not only a sedimentary hiatus/erosion of at least 30-m thickness in core DH02, most probably during the Last Glacial Maximum, but also that core DH02 was in a more reductive environment than core DH03 during late MIS 3. The findings highlight the potential of authigenic greigite as an indicator of spatiotemporal changes in paleoenvironmental and paleoceanographic conditions on the continental shelf at orbital or even suborbital timescales.

greigite continental shelf rock magnetism paleoenvironment paleoceanography sea-level change

SCI

英语

其他

National Natural Science Foundation of China[41976078] ; Basic Scientific Fund for National Public Research Institutes of China["2021S01","2021Q09"] ; Laboratory for Marine Geology, Qingdao Pilot National Laboratory for Marine Science and Technology[MGQNLM-TD201903]

Geology ; Oceanography ; Paleontology

Geosciences, Multidisciplinary ; Oceanography ; Paleontology

WOS:001006945200001

AMER GEOPHYSICAL UNION

Web of Science

1.Minist Nat Resources MNR, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao, Peoples R China
2.Qingdao Pilot Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China
5.Southern Univ Sci & Technol, Ctr Marine Magnetism CM2, Dept Ocean Sci & Engn, Shenzhen, Peoples R China

Liu, Jianxing,Xu, Taoyu,Zhang, Qiang,et al. Exploring Spatiotemporal Paleoenvironmental and Paleoceanographic Changes on the Continental Shelf Using Authigenic Greigite: A Case Study From the East China Sea[J]. PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,2023,38(6).

Liu, Jianxing.,Xu, Taoyu.,Zhang, Qiang.,Yu, Xiaoxiao.,Wu, Yonghua.,...&Shi, Xuefa.(2023).Exploring Spatiotemporal Paleoenvironmental and Paleoceanographic Changes on the Continental Shelf Using Authigenic Greigite: A Case Study From the East China Sea.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,38(6).

Liu, Jianxing,et al."Exploring Spatiotemporal Paleoenvironmental and Paleoceanographic Changes on the Continental Shelf Using Authigenic Greigite: A Case Study From the East China Sea".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 38.6(2023).