Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event
A large portion of ANDRILL (ANtarctic geological DRILLing) core AND-1B recovered in the Western Ross Sea and spanning the early Pliocene has been investigated in order to obtain a detailed carbonate isotope record from Antarctic margin sediments through the early Pliocene warming event. Petrographic...
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Online Access: | http://hdl.handle.net/10447/54035 https://doi.org/10.1016/j.gloplacha.2010.11.006 |
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ftunivpalermo:oai:iris.unipa.it:10447/54035 2024-02-11T09:58:43+01:00 Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event SCOPELLITI, Giovanna BELLANCA, Adriana NERI, Rodolfo Scopelliti, G Bellanca, A Neri, R 2011 http://hdl.handle.net/10447/54035 https://doi.org/10.1016/j.gloplacha.2010.11.006 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000288934400003 volume:76 issue:76 firstpage:22 lastpage:32 numberofpages:11 journal:GLOBAL AND PLANETARY CHANGE http://hdl.handle.net/10447/54035 doi:10.1016/j.gloplacha.2010.11.006 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79952317428 info:eu-repo/semantics/closedAccess stable isotope palaeoclimate early Pliocene ANDRILL Antarctica info:eu-repo/semantics/article 2011 ftunivpalermo https://doi.org/10.1016/j.gloplacha.2010.11.006 2024-01-23T23:23:59Z A large portion of ANDRILL (ANtarctic geological DRILLing) core AND-1B recovered in the Western Ross Sea and spanning the early Pliocene has been investigated in order to obtain a detailed carbonate isotope record from Antarctic margin sediments through the early Pliocene warming event. Petrographic observations and mineralogical analyses reveal the authigenic nature of the carbonate and small proportions of Fe and Mg incorporated within the calcite lattice. High productivity conditions testified by ~80 m-thick diatomite interval (383 to 460 mbsf) well fit with the composite nature of the authigenic carbonate generally characterizing organic matter-rich sediments. As is known, sediments from the Polar Region are generally poor in carbonate. Although in the investigated portion of AND-1B core the carbonate seldom exceeds 5% in content, an automated Carbonate Preparation Device was used to obtain a high-resolution stable isotope dataset. Paleoenvironmental conditions characterized by high organic matter flux are supported by negative δ13C values suggesting a contribution of isotopically light biogenic CO2 during the carbonate precipitation. As to δ18O, even if melting glaciers are thought to be responsible for depletion in 18O composition, the isotope record exhibits long- and short-term trends. Analysis of the long-term trend constrains the Pliocene warming climax in an interval between 400–450 mbsf highlighting that most of the event is not documented because of a 800 kyr hiatus. The short-term trend documents the influence of obliquity controlling the annual insolation, but also that of precession-linked cyclicity seldom documented at high latitude. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ross Sea IRIS Università degli Studi di Palermo Antarctic Ross Sea Global and Planetary Change 76 1-2 22 32 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Palermo |
op_collection_id |
ftunivpalermo |
language |
English |
topic |
stable isotope palaeoclimate early Pliocene ANDRILL Antarctica |
spellingShingle |
stable isotope palaeoclimate early Pliocene ANDRILL Antarctica SCOPELLITI, Giovanna BELLANCA, Adriana NERI, Rodolfo Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event |
topic_facet |
stable isotope palaeoclimate early Pliocene ANDRILL Antarctica |
description |
A large portion of ANDRILL (ANtarctic geological DRILLing) core AND-1B recovered in the Western Ross Sea and spanning the early Pliocene has been investigated in order to obtain a detailed carbonate isotope record from Antarctic margin sediments through the early Pliocene warming event. Petrographic observations and mineralogical analyses reveal the authigenic nature of the carbonate and small proportions of Fe and Mg incorporated within the calcite lattice. High productivity conditions testified by ~80 m-thick diatomite interval (383 to 460 mbsf) well fit with the composite nature of the authigenic carbonate generally characterizing organic matter-rich sediments. As is known, sediments from the Polar Region are generally poor in carbonate. Although in the investigated portion of AND-1B core the carbonate seldom exceeds 5% in content, an automated Carbonate Preparation Device was used to obtain a high-resolution stable isotope dataset. Paleoenvironmental conditions characterized by high organic matter flux are supported by negative δ13C values suggesting a contribution of isotopically light biogenic CO2 during the carbonate precipitation. As to δ18O, even if melting glaciers are thought to be responsible for depletion in 18O composition, the isotope record exhibits long- and short-term trends. Analysis of the long-term trend constrains the Pliocene warming climax in an interval between 400–450 mbsf highlighting that most of the event is not documented because of a 800 kyr hiatus. The short-term trend documents the influence of obliquity controlling the annual insolation, but also that of precession-linked cyclicity seldom documented at high latitude. |
author2 |
Scopelliti, G Bellanca, A Neri, R |
format |
Article in Journal/Newspaper |
author |
SCOPELLITI, Giovanna BELLANCA, Adriana NERI, Rodolfo |
author_facet |
SCOPELLITI, Giovanna BELLANCA, Adriana NERI, Rodolfo |
author_sort |
SCOPELLITI, Giovanna |
title |
Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event |
title_short |
Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event |
title_full |
Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event |
title_fullStr |
Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event |
title_full_unstemmed |
Petrography and carbonate isotope stratigraphy from MIS AND-1B core, Antarctica: Evidence of the early Pliocene warming event |
title_sort |
petrography and carbonate isotope stratigraphy from mis and-1b core, antarctica: evidence of the early pliocene warming event |
publishDate |
2011 |
url |
http://hdl.handle.net/10447/54035 https://doi.org/10.1016/j.gloplacha.2010.11.006 |
geographic |
Antarctic Ross Sea |
geographic_facet |
Antarctic Ross Sea |
genre |
Antarc* Antarctic Antarctica Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000288934400003 volume:76 issue:76 firstpage:22 lastpage:32 numberofpages:11 journal:GLOBAL AND PLANETARY CHANGE http://hdl.handle.net/10447/54035 doi:10.1016/j.gloplacha.2010.11.006 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79952317428 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2010.11.006 |
container_title |
Global and Planetary Change |
container_volume |
76 |
container_issue |
1-2 |
container_start_page |
22 |
op_container_end_page |
32 |
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1790594444169314304 |