Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica

Bu, Ruyuan; Long, Yi; Hu, Bangqi; Li, Yunhai; Ji, Youjun; Li, Yixin; Wang, Liang

doi:10.3389/feart.2022.863336

Cited by 2 publications

(2 citation statements)

References 56 publications

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“…The correlation between the IRD proxies and magnetic susceptibility may be due to climate driving. Similar to the glacial-interglacial cycles of MS, during cold periods, the Ross Ice Shelf likely extended to the research sites [18,32,33], resulting in more IRDs; meanwhile, the ice-shelf front might be away from the research sites during a warm climate, leading to a decrease in IRD materials.…”

Section: Influences On Magnetic Susceptibilitymentioning

confidence: 96%

“…Climatic changes in the Southern Ocean and Antarctica are critical in Earth's climate evolution [1][2][3][4][5][6] due to their unique geographical location, environmental processes, and climate characteristics [7][8][9]. The Ross Sea is the second largest bay in the Southern Ocean (72-77 • S, 160 • E-160 • W), and studies on sediments in this key region have attracted great attention in the past [10][11][12][13][14], such as sedimentary processes, ice-shelf dynamics, sea-ice variation, and oceanic currents [15][16][17][18][19][20][21]. For instance, integrating geophysical surveys and multiple cores in the Ross [35].…”

Section: Introductionmentioning

confidence: 99%

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Chronology and Sedimentary Processes in the Western Ross Sea, Antarctica since the Last Glacial Period

Liu,

Shen,

Han

et al. 2024

JMSE

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The stability of contemporary ice shelves is under threat due to global warming, and the geological records in the Ross Sea offer such an opportunity to test the linkage between them. However, the absence of calcareous microfossils in the sediments of the Ross Sea results in uncertainties in establishing a precise chronology for studies. Hence, three sediment cores were collected and studied in terms of radiocarbon dating, magnetic susceptibility, and sediment grain size to reconstruct the environmental processes in the Ross Sea since the last glacial period. The main results are as follows: (1) two grain-size components were identified for the studied cores, which can be correlated to ice-shelf and sea-ice transport, respectively; (2) due to old-carbon contamination and an inconsistent carbon reservoir, the radiocarbon dates were generally underestimated, and as an alternative, changes in magnetic susceptibility of the studied cores can be tuned to the ice-core records to establish a reliable age–depth model and; (3) integrating sediment grain-size changes and comparisons with other paleoenvironmental proxies in the Antarctic, a process from a sub-ice sheet in the last glacial period to a sub-ice shelf in the glacial maximum, and, finally, to a glaciomarine state since the last deglacial period was identified in the western Ross Sea. Integrating these findings, the warming processes in the Antarctic were highlighted in the retreat processes of the Ross Ice Shelf in the past.

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Section: Influences On Magnetic Susceptibilitymentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Chronology and Sedimentary Processes in the Western Ross Sea, Antarctica since the Last Glacial Period

Liu,

Shen,

Han

et al. 2024

JMSE

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Fallacy of paleoproductivity signals by the recycled biogenic components: case study in the Central Basin of the northwestern Ross Sea

Khim,

Kim,

Lee

et al. 2024

Geosci. Lett.

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Core LC42, retrieved from the Central Basin of the northwestern Ross Sea, contains three distinct sediment facies (IRD (ice-rafted debris)-poor bioturbated sandy mud, IRD-rich massive sandy mud, and laminated mud) that are interleaved with each other and deposited over the last 1 Ma. The biogenic components (biogenic opal, total organic carbon, and total nitrogen) of the laminated mud layers are consistently higher than the other two facies throughout the core. Based on the depositional succession of sediment facies and IRD-related depositional processes in the Antarctic continental margin, the laminated mud layers without IRD have been deposited during the glacial periods, but the enhanced paleoproductivity in terms of biogenic components during the mud deposition is unexpected. Backscattered electron imagery substantiates distinctly different componentry of the alternating light and dark laminae in the laminated mud. In particular, the light laminae contain scattered diatom fragments and eroded sand-sized lumps of fossil-bearing mud, whereas the dark laminae are clayey and diatomaceous. Both laminae thus are characterized by the high biogenic components, but they are interpreted to have been principally recycled from older deposits because diatom fragments are mostly reworked and old and their archives are poorly preserved. During the glacial periods, these laminated muds were deposited downward by milky plumes of meltwater discharged underneath the advancing glaciers that scoured the earlier-deposited and semi-consolidated diatom-rich sediments. Our study thus highlights that the recycling of biogenic particles should be precautious to avoid the fallacy of paleoclimatic interpretation in formulating climate-productivity models in the Antarctic continental margin.

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Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica

Cited by 2 publications

References 56 publications

Chronology and Sedimentary Processes in the Western Ross Sea, Antarctica since the Last Glacial Period

Chronology and Sedimentary Processes in the Western Ross Sea, Antarctica since the Last Glacial Period

Fallacy of paleoproductivity signals by the recycled biogenic components: case study in the Central Basin of the northwestern Ross Sea

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