Last Glacial Maximum to Holocene paleoceanography of the northwestern Ross Sea inferred from sediment core geochemistry and micropaleontology at Hallett Ridge
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Published:2021-03-10
Issue:1
Volume:40
Page:15-35
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ISSN:2041-4978
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Container-title:Journal of Micropalaeontology
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language:en
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Short-container-title:J. Micropalaeontol.
Author:
Melis Romana, Capotondi LucillaORCID, Torricella FiorenzaORCID, Ferretti PatriziaORCID, Geniram Andrea, Hong Jong Kuk, Kuhn GerhardORCID, Khim Boo-Keun, Kim SookwanORCID, Malinverno Elisa, Yoo Kyu Cheul, Colizza Ester
Abstract
Abstract. During the Late Pleistocene–Holocene, the Ross Sea Ice Shelf exhibited
strong spatial variability in relation to the atmospheric and oceanographic
climatic variations. Despite being thoroughly investigated, the timing of
the ice sheet retreat from the outer continental shelf since the Last
Glacial Maximum (LGM) still remains controversial, mainly due to a lack of
sediment cores with a robust chronostratigraphy. For this reason, the recent
recovery of sediments containing a continuous occurrence of calcareous
foraminifera provides the important opportunity to create a reliable age
model and document the early deglacial phase in particular. Here we present
a multiproxy study from a sediment core collected at the Hallett Ridge (1800 m of depth), where significant occurrences of calcareous planktonic and benthic
foraminifera allow us to document the first evidence of the deglaciation
after the LGM at about 20.2 ka. Our results suggest that the
co-occurrence of large Neogloboquadrina pachyderma tests and abundant juvenile forms reflects the
beginning of open-water conditions and coverage of seasonal sea ice. Our
multiproxy approach based on diatoms, silicoflagellates, carbon and oxygen
stable isotopes on N. pachyderma, sediment texture, and geochemistry indicates that
abrupt warming occurred at approximately 17.8 ka, followed by a period of
increasing biological productivity. During the Holocene, the exclusive
dominance of agglutinated benthic foraminifera suggests that dissolution was
the main controlling factor on calcareous test accumulation and preservation.
Diatoms and silicoflagellates show that ocean conditions were variable
during the middle Holocene and the beginning of the Neoglacial period at
around 4 ka. In the Neoglacial, an increase in sand content testifies to
a strengthening of bottom-water currents, supported by an increase in the
abundance of the tycopelagic fossil diatom Paralia sulcata transported from the coastal
regions, while an increase in ice-rafted debris suggests more glacial
transport by icebergs.
Funder
National Research Foundation of Korea
Publisher
Copernicus GmbH
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