Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica
The palaeoceanographic studies are largely limited by poor carbonate preservation in high-latitude regions. To improve our knowledge in this key area, we studied a sediment core (ANT32-RA05C) in terms of paleomagnetic and 230Th dating and geochemical properties, collected from the continental slope...
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ftdoajarticles:oai:doaj.org/article:02e81a779a044571a4e7fd8738932e2d 2023-05-15T13:50:45+02:00 Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica Guogang Li Ruyuan Bu Liang Yi Bangqi Hu Yunhai Li Youjun Ji Yixin Li Liang Wang 2022-04-01T00:00:00Z https://doi.org/10.3389/feart.2022.863336 https://doaj.org/article/02e81a779a044571a4e7fd8738932e2d EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.863336/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.863336 https://doaj.org/article/02e81a779a044571a4e7fd8738932e2d Frontiers in Earth Science, Vol 10 (2022) Ross Sea Late Pleistocene paleomagnetism 230Th dating ice-rafted debris biogenic silica Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.863336 2022-12-30T23:56:33Z The palaeoceanographic studies are largely limited by poor carbonate preservation in high-latitude regions. To improve our knowledge in this key area, we studied a sediment core (ANT32-RA05C) in terms of paleomagnetic and 230Th dating and geochemical properties, collected from the continental slope of the Ross Sea, Antarctica. The two major results are as follows: 1) the sedimentation rate based on 230Th isotopes is 1.37 cm/kyr, agreeing well with the correlation of the relative paleomagnetic intensity of the core ANT32-RA05C to changes in Earth’s magnetic intensity and 2) the sediments contain ice-rafted debris (IRD) over 30%, with a considerable contribution of siliceous deposits. Integrating geochronological and geochemical properties of the studied core, a correlation of the regional paleoenvironmental process to the EPICA Dome C (EDC) Antarctic temperature is established, inferring that the IRD input and primary productivity are both enhanced in a warm climate. Moreover, a leading phase of biogenic processes to changes in the ice sheet in the Ross Ice Shelf is observed, highlighting a dominant role of the oceanic circulation in the ice-sheet retreat during the last deglaciation. Overall, the sedimentary record in the Ross Sea documents some key features of the paleoenvironmental processes in the Late Pleistocene, which could be correlated with large-scale changes in Antarctica and thus are worthy of further investigation in the future. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA Ice Sheet Ice Shelf Ross Ice Shelf Ross Sea Directory of Open Access Journals: DOAJ Articles Antarctic Ross Ice Shelf Ross Sea Frontiers in Earth Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ross Sea Late Pleistocene paleomagnetism 230Th dating ice-rafted debris biogenic silica Science Q |
spellingShingle |
Ross Sea Late Pleistocene paleomagnetism 230Th dating ice-rafted debris biogenic silica Science Q Guogang Li Ruyuan Bu Liang Yi Bangqi Hu Yunhai Li Youjun Ji Yixin Li Liang Wang Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica |
topic_facet |
Ross Sea Late Pleistocene paleomagnetism 230Th dating ice-rafted debris biogenic silica Science Q |
description |
The palaeoceanographic studies are largely limited by poor carbonate preservation in high-latitude regions. To improve our knowledge in this key area, we studied a sediment core (ANT32-RA05C) in terms of paleomagnetic and 230Th dating and geochemical properties, collected from the continental slope of the Ross Sea, Antarctica. The two major results are as follows: 1) the sedimentation rate based on 230Th isotopes is 1.37 cm/kyr, agreeing well with the correlation of the relative paleomagnetic intensity of the core ANT32-RA05C to changes in Earth’s magnetic intensity and 2) the sediments contain ice-rafted debris (IRD) over 30%, with a considerable contribution of siliceous deposits. Integrating geochronological and geochemical properties of the studied core, a correlation of the regional paleoenvironmental process to the EPICA Dome C (EDC) Antarctic temperature is established, inferring that the IRD input and primary productivity are both enhanced in a warm climate. Moreover, a leading phase of biogenic processes to changes in the ice sheet in the Ross Ice Shelf is observed, highlighting a dominant role of the oceanic circulation in the ice-sheet retreat during the last deglaciation. Overall, the sedimentary record in the Ross Sea documents some key features of the paleoenvironmental processes in the Late Pleistocene, which could be correlated with large-scale changes in Antarctica and thus are worthy of further investigation in the future. |
format |
Article in Journal/Newspaper |
author |
Guogang Li Ruyuan Bu Liang Yi Bangqi Hu Yunhai Li Youjun Ji Yixin Li Liang Wang |
author_facet |
Guogang Li Ruyuan Bu Liang Yi Bangqi Hu Yunhai Li Youjun Ji Yixin Li Liang Wang |
author_sort |
Guogang Li |
title |
Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica |
title_short |
Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica |
title_full |
Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica |
title_fullStr |
Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica |
title_full_unstemmed |
Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, Antarctica |
title_sort |
geochronology and paleoenvironmental changes of late pleistocene sediments in the ross sea, antarctica |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.863336 https://doaj.org/article/02e81a779a044571a4e7fd8738932e2d |
geographic |
Antarctic Ross Ice Shelf Ross Sea |
geographic_facet |
Antarctic Ross Ice Shelf Ross Sea |
genre |
Antarc* Antarctic Antarctica EPICA Ice Sheet Ice Shelf Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica EPICA Ice Sheet Ice Shelf Ross Ice Shelf Ross Sea |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.863336/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.863336 https://doaj.org/article/02e81a779a044571a4e7fd8738932e2d |
op_doi |
https://doi.org/10.3389/feart.2022.863336 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766253976608571392 |