Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum
The continental margin is a key area for studying the sedimentary processes related to the advance and retreat of the Ross Ice Shelf (Antarctica); nevertheless, much remains to be investigated. The aim of this study is to increase the knowledge of the last glacial/deglacial dynamics in the Central B...
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MDPI AG
2021-03-01
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| Seria: | Geosciences |
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| Dostęp online: | https://www.mdpi.com/2076-3263/11/4/155 |
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| author | Fiorenza Torricella Romana Melis Elisa Malinverno Giorgio Fontolan Mauro Bussi Lucilla Capotondi Paola Del Carlo Alessio Di Roberto Andrea Geniram Gerhard Kuhn Boo-Keun Khim Caterina Morigi Bianca Scateni Ester Colizza |
| author_facet | Fiorenza Torricella Romana Melis Elisa Malinverno Giorgio Fontolan Mauro Bussi Lucilla Capotondi Paola Del Carlo Alessio Di Roberto Andrea Geniram Gerhard Kuhn Boo-Keun Khim Caterina Morigi Bianca Scateni Ester Colizza |
| author_sort | Fiorenza Torricella |
| collection | DOAJ |
| description | The continental margin is a key area for studying the sedimentary processes related to the advance and retreat of the Ross Ice Shelf (Antarctica); nevertheless, much remains to be investigated. The aim of this study is to increase the knowledge of the last glacial/deglacial dynamics in the Central Basin slope–basin system using a multidisciplinary approach, including integrated sedimentological, micropaleontological and tephrochronological information. The analyses carried out on three box cores highlighted sedimentary sequences characterised by tree stratigraphic units. Collected sediments represent a time interval from 24 ka Before Present (BP) to the present time. Grain size clustering and data on the sortable silt component, together with diatom, silicoflagellate and foraminifera assemblages indicate the influence of the ice shelf calving zone (Unit 1, 24–17 ka BP), progressive receding due to Circumpolar Deep Water inflow (Unit 2, 17–10.2 ka BP) and (Unit 3, 10.2 ka BP–present) the establishment of seasonal sea ice with a strengthening of bottom currents. The dominant and persistent process is a sedimentation controlled by contour currents, which tend to modulate intensity in time and space. A primary volcanic ash layer dated back at around 22 ka BP is correlated with the explosive activity of Mount Rittmann. |
| first_indexed | 2024-03-10T12:44:12Z |
| format | Article |
| id | doaj.art-1daaceba55fa46198a8306019ba9451d |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-10T12:44:12Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-1daaceba55fa46198a8306019ba9451d2023-11-21T13:36:23ZengMDPI AGGeosciences2076-32632021-03-0111415510.3390/geosciences11040155Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial MaximumFiorenza Torricella0Romana Melis1Elisa Malinverno2Giorgio Fontolan3Mauro Bussi4Lucilla Capotondi5Paola Del Carlo6Alessio Di Roberto7Andrea Geniram8Gerhard Kuhn9Boo-Keun Khim10Caterina Morigi11Bianca Scateni12Ester Colizza13Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Matematica e Geoscienze, Università di Trieste, Via E. Weiss 2, 34128 Trieste, ItalyDipartimento di Scienze dell’Ambiente e della Terra, Università di Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, ItalyDipartimento di Matematica e Geoscienze, Università di Trieste, Via E. Weiss 2, 34128 Trieste, ItalyDipartimento di Matematica e Geoscienze, Università di Trieste, Via E. Weiss 2, 34128 Trieste, ItalyIstituto di Scienze Marine-Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129 Bologna, ItalyIstituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Via C. Battisti 53, 56125 Pisa, ItalyIstituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Via C. Battisti 53, 56125 Pisa, ItalyDipartimento di Matematica e Geoscienze, Università di Trieste, Via E. Weiss 2, 34128 Trieste, ItalyAlfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, GermanyDepartment of Oceanography, Pusan National University, Busan 46241, KoreaDipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Matematica e Geoscienze, Università di Trieste, Via E. Weiss 2, 34128 Trieste, ItalyThe continental margin is a key area for studying the sedimentary processes related to the advance and retreat of the Ross Ice Shelf (Antarctica); nevertheless, much remains to be investigated. The aim of this study is to increase the knowledge of the last glacial/deglacial dynamics in the Central Basin slope–basin system using a multidisciplinary approach, including integrated sedimentological, micropaleontological and tephrochronological information. The analyses carried out on three box cores highlighted sedimentary sequences characterised by tree stratigraphic units. Collected sediments represent a time interval from 24 ka Before Present (BP) to the present time. Grain size clustering and data on the sortable silt component, together with diatom, silicoflagellate and foraminifera assemblages indicate the influence of the ice shelf calving zone (Unit 1, 24–17 ka BP), progressive receding due to Circumpolar Deep Water inflow (Unit 2, 17–10.2 ka BP) and (Unit 3, 10.2 ka BP–present) the establishment of seasonal sea ice with a strengthening of bottom currents. The dominant and persistent process is a sedimentation controlled by contour currents, which tend to modulate intensity in time and space. A primary volcanic ash layer dated back at around 22 ka BP is correlated with the explosive activity of Mount Rittmann.https://www.mdpi.com/2076-3263/11/4/155diatomsmicropaleontologysedimentologycryptotephraLGM to HoloceneCentral Basin |
| spellingShingle | Fiorenza Torricella Romana Melis Elisa Malinverno Giorgio Fontolan Mauro Bussi Lucilla Capotondi Paola Del Carlo Alessio Di Roberto Andrea Geniram Gerhard Kuhn Boo-Keun Khim Caterina Morigi Bianca Scateni Ester Colizza Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum Geosciences diatoms micropaleontology sedimentology cryptotephra LGM to Holocene Central Basin |
| title | Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum |
| title_full | Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum |
| title_fullStr | Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum |
| title_full_unstemmed | Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum |
| title_short | Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum |
| title_sort | environmental and oceanographic conditions at the continental margin of the central basin northwestern ross sea antarctica since the last glacial maximum |
| topic | diatoms micropaleontology sedimentology cryptotephra LGM to Holocene Central Basin |
| url | https://www.mdpi.com/2076-3263/11/4/155 |
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