Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles
This study focuses on the understanding of depositional patterns over late Quaternary glacial/interglacial cycles and of the influence of diagenesis on geochemical sedimentary records from the continental margin off Adélie Land (East Antarctica). We provide a complete analysis of the 30-m-long sedim...
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| creator | Presti, Massimo Barbara, Loïc Denis, Delphine Schmidt, Sabine De Santis, Laura Crosta, Xavier |
| description | This study focuses on the understanding of depositional patterns over late Quaternary glacial/interglacial cycles and of the influence of diagenesis on geochemical sedimentary records from the continental margin off Adélie Land (East Antarctica). We provide a complete analysis of the 30-m-long sediment core MD03-2603, collected on a deep-sea sediment mound deposit. The LR04 benthic oxygen isotope stack vs. down-core records of Ba/Al and Ba/Ti atomic ratios, reflectance data and micropaleontological evidence, allow to determine a detailed chronology back to ~
490
ka BP. Long-lived Uranium and Thorium (
238U,
234U,
232Th, and
230Th) provide an assessment of lateral vs. vertical sediment advection, by constraining the sediment focusing factor (Φ). Φ is high in most glacial intervals, when mostly detrital material was transported down-slope and focused to the core area. Interglacials display highs in Ba/Al and Ba/Ti, coupled to low Φ values, related to stronger contour current flow. Biogenic fractions are more abundant during interglacials and more diluted by detrital fractions during glacials. The diatom assemblage is dominated by the open-ocean species
Fragilariopsis kerguelensis, but glacial intervals display an increase of sea-ice related and coastal species. The integrated approach (high-resolution record of major and minor elements, U
auth, δ
15N, N
org, δ
13C, and C
org) provides key insights into how redox conditions affect glacial/interglacial sedimentation processes. Our evidence shows that diagenetic effects, due to development of reducing conditions and consequent higher preservation of organic matter, may overprint the paleoclimatic significance of some proxies involved into a sequence of diagenetic remineralization pathways. Comparison of the marine record to ice-core data (EPICA Dome C-EDC) allows to extend the information to the whole East Antarctic margin. Sediment proxies of increased burial of biogenic material, or increased preservation of organic matter, are linked to climatic amelioration on the continent. Highs in EDC dust flux correlate with high Mn/Al and Mo/Al ratios within the sediment record, confirming that establishment of colder conditions on the continent triggered changes in sedimentation rates at the glacial/interglacial transition, which in turn affected the development of reducing redox fronts within the sediment.
► Depositional patterns and influence of diagenesis on Antarctic sedimentary records. ► A complete analysis of a |
| doi_str_mv | 10.1016/j.margeo.2011.03.012 |
| format | Article |
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490
ka BP. Long-lived Uranium and Thorium (
238U,
234U,
232Th, and
230Th) provide an assessment of lateral vs. vertical sediment advection, by constraining the sediment focusing factor (Φ). Φ is high in most glacial intervals, when mostly detrital material was transported down-slope and focused to the core area. Interglacials display highs in Ba/Al and Ba/Ti, coupled to low Φ values, related to stronger contour current flow. Biogenic fractions are more abundant during interglacials and more diluted by detrital fractions during glacials. The diatom assemblage is dominated by the open-ocean species
Fragilariopsis kerguelensis, but glacial intervals display an increase of sea-ice related and coastal species. The integrated approach (high-resolution record of major and minor elements, U
auth, δ
15N, N
org, δ
13C, and C
org) provides key insights into how redox conditions affect glacial/interglacial sedimentation processes. Our evidence shows that diagenetic effects, due to development of reducing conditions and consequent higher preservation of organic matter, may overprint the paleoclimatic significance of some proxies involved into a sequence of diagenetic remineralization pathways. Comparison of the marine record to ice-core data (EPICA Dome C-EDC) allows to extend the information to the whole East Antarctic margin. Sediment proxies of increased burial of biogenic material, or increased preservation of organic matter, are linked to climatic amelioration on the continent. Highs in EDC dust flux correlate with high Mn/Al and Mo/Al ratios within the sediment record, confirming that establishment of colder conditions on the continent triggered changes in sedimentation rates at the glacial/interglacial transition, which in turn affected the development of reducing redox fronts within the sediment.
► Depositional patterns and influence of diagenesis on Antarctic sedimentary records. ► A complete analysis of a 30-m-long sediment core from a deep-sea sediment mound. ► We have determined a detailed chronology back to ~
490
ka BP. ► We have assessed lateral vs. vertical sediment advection. ► We show how redox conditions affect glacial/interglacial sedimentation.</description><identifier>ISSN: 0025-3227</identifier><identifier>EISSN: 1872-6151</identifier><identifier>DOI: 10.1016/j.margeo.2011.03.012</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Adélie Land ; Aluminum ; Antarctic Bottom Water ; Antarctica ; Bacillariophyceae ; biostratigraphy ; Climatology ; Deposition ; Earth Sciences ; Fragilariopsis kerguelensis ; geochemistry ; Land ; Marine ; Ocean, Atmosphere ; Oceanography ; Preservation ; Proxy client servers ; Sciences of the Universe ; Sedimentation ; sedimentation processes ; Sediments</subject><ispartof>Marine geology, 2011-06, Vol.284 (1), p.96-113</ispartof><rights>2011 Elsevier B.V.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a428t-ed7b96052c2083ce266dffbab44aaeab82ca70a07a6ee5fd87cda58bc64a5b543</citedby><cites>FETCH-LOGICAL-a428t-ed7b96052c2083ce266dffbab44aaeab82ca70a07a6ee5fd87cda58bc64a5b543</cites><orcidid>0000-0002-8005-9939 ; 0000-0002-5985-9747</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.margeo.2011.03.012$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,780,784,885,3548,27922,27923,45993</link.rule.ids><backlink>$$Uhttps://hal.science/hal-02105651$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Presti, Massimo</creatorcontrib><creatorcontrib>Barbara, Loïc</creatorcontrib><creatorcontrib>Denis, Delphine</creatorcontrib><creatorcontrib>Schmidt, Sabine</creatorcontrib><creatorcontrib>De Santis, Laura</creatorcontrib><creatorcontrib>Crosta, Xavier</creatorcontrib><title>Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles</title><title>Marine geology</title><description>This study focuses on the understanding of depositional patterns over late Quaternary glacial/interglacial cycles and of the influence of diagenesis on geochemical sedimentary records from the continental margin off Adélie Land (East Antarctica). We provide a complete analysis of the 30-m-long sediment core MD03-2603, collected on a deep-sea sediment mound deposit. The LR04 benthic oxygen isotope stack vs. down-core records of Ba/Al and Ba/Ti atomic ratios, reflectance data and micropaleontological evidence, allow to determine a detailed chronology back to ~
490
ka BP. Long-lived Uranium and Thorium (
238U,
234U,
232Th, and
230Th) provide an assessment of lateral vs. vertical sediment advection, by constraining the sediment focusing factor (Φ). Φ is high in most glacial intervals, when mostly detrital material was transported down-slope and focused to the core area. Interglacials display highs in Ba/Al and Ba/Ti, coupled to low Φ values, related to stronger contour current flow. Biogenic fractions are more abundant during interglacials and more diluted by detrital fractions during glacials. The diatom assemblage is dominated by the open-ocean species
Fragilariopsis kerguelensis, but glacial intervals display an increase of sea-ice related and coastal species. The integrated approach (high-resolution record of major and minor elements, U
auth, δ
15N, N
org, δ
13C, and C
org) provides key insights into how redox conditions affect glacial/interglacial sedimentation processes. Our evidence shows that diagenetic effects, due to development of reducing conditions and consequent higher preservation of organic matter, may overprint the paleoclimatic significance of some proxies involved into a sequence of diagenetic remineralization pathways. Comparison of the marine record to ice-core data (EPICA Dome C-EDC) allows to extend the information to the whole East Antarctic margin. Sediment proxies of increased burial of biogenic material, or increased preservation of organic matter, are linked to climatic amelioration on the continent. Highs in EDC dust flux correlate with high Mn/Al and Mo/Al ratios within the sediment record, confirming that establishment of colder conditions on the continent triggered changes in sedimentation rates at the glacial/interglacial transition, which in turn affected the development of reducing redox fronts within the sediment.
► Depositional patterns and influence of diagenesis on Antarctic sedimentary records. ► A complete analysis of a 30-m-long sediment core from a deep-sea sediment mound. ► We have determined a detailed chronology back to ~
490
ka BP. ► We have assessed lateral vs. vertical sediment advection. ► We show how redox conditions affect glacial/interglacial sedimentation.</description><subject>Adélie Land</subject><subject>Aluminum</subject><subject>Antarctic Bottom Water</subject><subject>Antarctica</subject><subject>Bacillariophyceae</subject><subject>biostratigraphy</subject><subject>Climatology</subject><subject>Deposition</subject><subject>Earth Sciences</subject><subject>Fragilariopsis kerguelensis</subject><subject>geochemistry</subject><subject>Land</subject><subject>Marine</subject><subject>Ocean, Atmosphere</subject><subject>Oceanography</subject><subject>Preservation</subject><subject>Proxy client servers</subject><subject>Sciences of the Universe</subject><subject>Sedimentation</subject><subject>sedimentation processes</subject><subject>Sediments</subject><issn>0025-3227</issn><issn>1872-6151</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNp9kc1u1DAURiMEEkPLG7DwjnaRcO3ETmaDNKpKW2kkVNGurRvnBjzyxIPtGWkWPBDPwYvhKIhlV_4736crn6L4wKHiwNWnXbXH8J18JYDzCuoKuHhVrHjXilJxyV8XKwAhy1qI9m3xLsYdAPCai1Xx6xsNdk9TYgM5e6JwZjgN-XDw0SbrJ3TsgClRmCLz48g2w5_fzhLbztjVLcbENlPCYJI1eM3sxAI5nJMseZZ3xB6POOcxdxtn9_nRMHM2juJl8WZEF-n9v_WieP5y-3RzX26_3j3cbLYlNqJLJQ1tv1YghRHQ1YaEUsM49tg3DSJh3wmDLSC0qIjkOHStGVB2vVENyl429UVxvfT-QKcPIc8Qztqj1febrZ7vQHCQSvITz-zHhT0E__NIMem9jYacw4n8MepuveaNAr7O5NWLJG-V4ELKbkabBTXBxxho_D8FBz071Du9ONSzQw21zg5z7PMSo_w5J0tBR2NpMtlZIJP04O3LBX8BxY2pEg</recordid><startdate>20110601</startdate><enddate>20110601</enddate><creator>Presti, Massimo</creator><creator>Barbara, Loïc</creator><creator>Denis, Delphine</creator><creator>Schmidt, Sabine</creator><creator>De Santis, Laura</creator><creator>Crosta, Xavier</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-8005-9939</orcidid><orcidid>https://orcid.org/0000-0002-5985-9747</orcidid></search><sort><creationdate>20110601</creationdate><title>Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles</title><author>Presti, Massimo ; Barbara, Loïc ; Denis, Delphine ; Schmidt, Sabine ; De Santis, Laura ; Crosta, Xavier</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a428t-ed7b96052c2083ce266dffbab44aaeab82ca70a07a6ee5fd87cda58bc64a5b543</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Adélie Land</topic><topic>Aluminum</topic><topic>Antarctic Bottom Water</topic><topic>Antarctica</topic><topic>Bacillariophyceae</topic><topic>biostratigraphy</topic><topic>Climatology</topic><topic>Deposition</topic><topic>Earth Sciences</topic><topic>Fragilariopsis kerguelensis</topic><topic>geochemistry</topic><topic>Land</topic><topic>Marine</topic><topic>Ocean, Atmosphere</topic><topic>Oceanography</topic><topic>Preservation</topic><topic>Proxy client servers</topic><topic>Sciences of the Universe</topic><topic>Sedimentation</topic><topic>sedimentation processes</topic><topic>Sediments</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Presti, Massimo</creatorcontrib><creatorcontrib>Barbara, Loïc</creatorcontrib><creatorcontrib>Denis, Delphine</creatorcontrib><creatorcontrib>Schmidt, Sabine</creatorcontrib><creatorcontrib>De Santis, Laura</creatorcontrib><creatorcontrib>Crosta, Xavier</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Marine geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Presti, Massimo</au><au>Barbara, Loïc</au><au>Denis, Delphine</au><au>Schmidt, Sabine</au><au>De Santis, Laura</au><au>Crosta, Xavier</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles</atitle><jtitle>Marine geology</jtitle><date>2011-06-01</date><risdate>2011</risdate><volume>284</volume><issue>1</issue><spage>96</spage><epage>113</epage><pages>96-113</pages><issn>0025-3227</issn><eissn>1872-6151</eissn><abstract>This study focuses on the understanding of depositional patterns over late Quaternary glacial/interglacial cycles and of the influence of diagenesis on geochemical sedimentary records from the continental margin off Adélie Land (East Antarctica). We provide a complete analysis of the 30-m-long sediment core MD03-2603, collected on a deep-sea sediment mound deposit. The LR04 benthic oxygen isotope stack vs. down-core records of Ba/Al and Ba/Ti atomic ratios, reflectance data and micropaleontological evidence, allow to determine a detailed chronology back to ~
490
ka BP. Long-lived Uranium and Thorium (
238U,
234U,
232Th, and
230Th) provide an assessment of lateral vs. vertical sediment advection, by constraining the sediment focusing factor (Φ). Φ is high in most glacial intervals, when mostly detrital material was transported down-slope and focused to the core area. Interglacials display highs in Ba/Al and Ba/Ti, coupled to low Φ values, related to stronger contour current flow. Biogenic fractions are more abundant during interglacials and more diluted by detrital fractions during glacials. The diatom assemblage is dominated by the open-ocean species
Fragilariopsis kerguelensis, but glacial intervals display an increase of sea-ice related and coastal species. The integrated approach (high-resolution record of major and minor elements, U
auth, δ
15N, N
org, δ
13C, and C
org) provides key insights into how redox conditions affect glacial/interglacial sedimentation processes. Our evidence shows that diagenetic effects, due to development of reducing conditions and consequent higher preservation of organic matter, may overprint the paleoclimatic significance of some proxies involved into a sequence of diagenetic remineralization pathways. Comparison of the marine record to ice-core data (EPICA Dome C-EDC) allows to extend the information to the whole East Antarctic margin. Sediment proxies of increased burial of biogenic material, or increased preservation of organic matter, are linked to climatic amelioration on the continent. Highs in EDC dust flux correlate with high Mn/Al and Mo/Al ratios within the sediment record, confirming that establishment of colder conditions on the continent triggered changes in sedimentation rates at the glacial/interglacial transition, which in turn affected the development of reducing redox fronts within the sediment.
► Depositional patterns and influence of diagenesis on Antarctic sedimentary records. ► A complete analysis of a 30-m-long sediment core from a deep-sea sediment mound. ► We have determined a detailed chronology back to ~
490
ka BP. ► We have assessed lateral vs. vertical sediment advection. ► We show how redox conditions affect glacial/interglacial sedimentation.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.margeo.2011.03.012</doi><tpages>18</tpages><orcidid>https://orcid.org/0000-0002-8005-9939</orcidid><orcidid>https://orcid.org/0000-0002-5985-9747</orcidid></addata></record> |
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| ispartof | Marine geology, 2011-06, Vol.284 (1), p.96-113 |
| issn | 0025-3227 1872-6151 |
| language | eng |
| recordid | cdi_hal_primary_oai_HAL_hal_02105651v1 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Adélie Land Aluminum Antarctic Bottom Water Antarctica Bacillariophyceae biostratigraphy Climatology Deposition Earth Sciences Fragilariopsis kerguelensis geochemistry Land Marine Ocean, Atmosphere Oceanography Preservation Proxy client servers Sciences of the Universe Sedimentation sedimentation processes Sediments |
| title | Sediment delivery and depositional patterns off Adélie Land (East Antarctica) in relation to late Quaternary climatic cycles |
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