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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Frontiers Media S.A.
2022-04-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.863336/full |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-14T06:02:16Z |
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| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-14T06:02:16Z |
| publishDate | 2022-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-02e81a779a044571a4e7fd8738932e2d2022-12-22T02:08:41ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-04-011010.3389/feart.2022.863336863336Geochronology and Paleoenvironmental Changes of Late Pleistocene Sediments in the Ross Sea, AntarcticaGuogang Li0Ruyuan Bu1Liang Yi2Bangqi Hu3Yunhai Li4Youjun Ji5Yixin Li6Liang Wang7North China Sea Administration, Ministry of Natural Resources, Qingdao, ChinaNorth China Sea Administration, Ministry of Natural Resources, Qingdao, ChinaLaboratory of Marine Geology, Tongji University, Shanghai, ChinaQingdao Institute of Marine Geology, China Geological Survey, Qingdao, ChinaThird Institute of Oceanography, Ministry of Natural Resources, Xiamen, ChinaSecond Institute of Oceanography, Ministry of Natural Resources, Hangzhou, ChinaNorth China Sea Administration, Ministry of Natural Resources, Qingdao, ChinaThird Institute of Oceanography, Ministry of Natural Resources, Xiamen, ChinaThe 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.https://www.frontiersin.org/articles/10.3389/feart.2022.863336/fullRoss SeaLate Pleistocenepaleomagnetism230Th datingice-rafted debrisbiogenic silica |
| spellingShingle | 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 Frontiers in Earth Science Ross Sea Late Pleistocene paleomagnetism 230Th dating ice-rafted debris biogenic silica |
| title | 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_short | 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 |
| topic | Ross Sea Late Pleistocene paleomagnetism 230Th dating ice-rafted debris biogenic silica |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.863336/full |
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