Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins

We present a new record of radiocarbon ages measured by accelerator mass spectrometry (AMS) on a deep-sea core collected off the Pakistan Margin. The C-14 ages measured on the planktonic foraminifera Globigerinoides ruber from core MD04-2876 define a high and stable sedimentation rate on the order o...

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Main Authors: Bard, Edouard, Menot, Guillemette, Rostek, Frauke, Licari, Laetitia, Boening, Philipp, Edwards, R. Lawrence, Cheng, Hai, Wang, Yongjin, Heaton, Timothy J.
Format: Article in Journal/Newspaper
Language:English
Published: Univ Arizona Dept Geosciences 2013
Subjects:
14C
Online Access:https://archimer.ifremer.fr/doc/00264/37569/35852.pdf
https://archimer.ifremer.fr/doc/00264/37569/
id ftarchimer:oai:archimer.ifremer.fr:37569
record_format openpolar
spelling ftarchimer:oai:archimer.ifremer.fr:37569 2023-05-15T18:01:15+02:00 Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins Bard, Edouard Menot, Guillemette Rostek, Frauke Licari, Laetitia Boening, Philipp Edwards, R. Lawrence Cheng, Hai Wang, Yongjin Heaton, Timothy J. 2013 application/pdf https://archimer.ifremer.fr/doc/00264/37569/35852.pdf doi:2013 by the Arizona Board of Regents on behalf of the University of Arizona https://archimer.ifremer.fr/doc/00264/37569/ eng eng Univ Arizona Dept Geosciences https://archimer.ifremer.fr/doc/00264/37569/35852.pdf doi:2013 by the Arizona Board of Regents on behalf of the University of Arizona https://archimer.ifremer.fr/doc/00264/37569/ info:eu-repo/semantics/openAccess restricted use Radiocarbon (0033-8222) (Univ Arizona Dept Geosciences), 2013 , Vol. 55 , N. 4 , P. 1999-2019 berian Margin Pakistan Margin 14C calibration text Publication info:eu-repo/semantics/article 2013 ftarchimer 2021-09-23T20:26:05Z We present a new record of radiocarbon ages measured by accelerator mass spectrometry (AMS) on a deep-sea core collected off the Pakistan Margin. The C-14 ages measured on the planktonic foraminifera Globigerinoides ruber from core MD04-2876 define a high and stable sedimentation rate on the order of 50 cm/kyr over the last 50 kyr. The site is distant from the main upwelling zone of the western Arabian Sea where C-14 reservoir age is large and may be variable. Many independent proxies based on elemental analyses, mineralogy, biomarkers, isotopic proxies, and foraminiferal abundances show abrupt changes correlative with Dansgaard-Oeschger and Heinrich events. It is now common knowledge that these climatic events also affected the Arabian Sea during the last glacial period through changes in the Indian monsoon and in ventilation at intermediate depths. The stratigraphic agreement between all proxies, from fine-to coarse-size fractions, indicates that the foraminiferal C-14 ages are representative of the different sediment fractions. To build a calendar age scale for core MD04-2876, we matched its climate record to the oxygen isotopic (delta O-18) profile of Hulu Cave stalagmites that have been accurately dated by U-Th (Wang et al. 2001; Southon et al. 2012; Edwards et al., submitted). Both archives exhibit very similar signatures, even for century-long events linked to monsoonal variations. For comparison, we have also updated our previous work on core MD95-2042 from the Iberian Margin (Bard et al. 2004a, b, c), whose climate record has likewise been tuned to the high-resolution delta O-18 Hulu Cave profile. Sophisticated and novel statistical techniques were used to interpolate ages and calculate uncertainties between chronological tie-points (Heaton et al. 2013, this issue). The data from the Pakistan and Iberian margins compare well even if they come from distant sites characterized by different oceanic conditions. Collectively, the data also compare well with the IntCal09 curve, except for specific intervals around 16 cal kyr BP and from 28 to 31 cal kyr BP. During these intervals, the data indicate that C-14 is somewhat older than indicated by the IntCal09 curve. Agreement between the data from both oceanic sites suggests that the discrepancy is not due to local changes of sea-surface C-14 reservoir ages, but rather that the IntCal09 curve needed to be updated in these intervals as has been done in the framework of IntCal13 (Reimer et al. 2013a, this issue). Article in Journal/Newspaper Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Hulu ENVELOPE(8.610,8.610,62.837,62.837) Indian Reimer ENVELOPE(-86.200,-86.200,-77.800,-77.800)
institution Open Polar
collection Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
op_collection_id ftarchimer
language English
topic berian Margin
Pakistan Margin
14C
calibration
spellingShingle berian Margin
Pakistan Margin
14C
calibration
Bard, Edouard
Menot, Guillemette
Rostek, Frauke
Licari, Laetitia
Boening, Philipp
Edwards, R. Lawrence
Cheng, Hai
Wang, Yongjin
Heaton, Timothy J.
Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
topic_facet berian Margin
Pakistan Margin
14C
calibration
description We present a new record of radiocarbon ages measured by accelerator mass spectrometry (AMS) on a deep-sea core collected off the Pakistan Margin. The C-14 ages measured on the planktonic foraminifera Globigerinoides ruber from core MD04-2876 define a high and stable sedimentation rate on the order of 50 cm/kyr over the last 50 kyr. The site is distant from the main upwelling zone of the western Arabian Sea where C-14 reservoir age is large and may be variable. Many independent proxies based on elemental analyses, mineralogy, biomarkers, isotopic proxies, and foraminiferal abundances show abrupt changes correlative with Dansgaard-Oeschger and Heinrich events. It is now common knowledge that these climatic events also affected the Arabian Sea during the last glacial period through changes in the Indian monsoon and in ventilation at intermediate depths. The stratigraphic agreement between all proxies, from fine-to coarse-size fractions, indicates that the foraminiferal C-14 ages are representative of the different sediment fractions. To build a calendar age scale for core MD04-2876, we matched its climate record to the oxygen isotopic (delta O-18) profile of Hulu Cave stalagmites that have been accurately dated by U-Th (Wang et al. 2001; Southon et al. 2012; Edwards et al., submitted). Both archives exhibit very similar signatures, even for century-long events linked to monsoonal variations. For comparison, we have also updated our previous work on core MD95-2042 from the Iberian Margin (Bard et al. 2004a, b, c), whose climate record has likewise been tuned to the high-resolution delta O-18 Hulu Cave profile. Sophisticated and novel statistical techniques were used to interpolate ages and calculate uncertainties between chronological tie-points (Heaton et al. 2013, this issue). The data from the Pakistan and Iberian margins compare well even if they come from distant sites characterized by different oceanic conditions. Collectively, the data also compare well with the IntCal09 curve, except for specific intervals around 16 cal kyr BP and from 28 to 31 cal kyr BP. During these intervals, the data indicate that C-14 is somewhat older than indicated by the IntCal09 curve. Agreement between the data from both oceanic sites suggests that the discrepancy is not due to local changes of sea-surface C-14 reservoir ages, but rather that the IntCal09 curve needed to be updated in these intervals as has been done in the framework of IntCal13 (Reimer et al. 2013a, this issue).
format Article in Journal/Newspaper
author Bard, Edouard
Menot, Guillemette
Rostek, Frauke
Licari, Laetitia
Boening, Philipp
Edwards, R. Lawrence
Cheng, Hai
Wang, Yongjin
Heaton, Timothy J.
author_facet Bard, Edouard
Menot, Guillemette
Rostek, Frauke
Licari, Laetitia
Boening, Philipp
Edwards, R. Lawrence
Cheng, Hai
Wang, Yongjin
Heaton, Timothy J.
author_sort Bard, Edouard
title Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
title_short Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
title_full Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
title_fullStr Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
title_full_unstemmed Radiocarbon Calibration/Comparison Records Based on Marine Sediments from the Pakistan and Iberian Margins
title_sort radiocarbon calibration/comparison records based on marine sediments from the pakistan and iberian margins
publisher Univ Arizona Dept Geosciences
publishDate 2013
url https://archimer.ifremer.fr/doc/00264/37569/35852.pdf
https://archimer.ifremer.fr/doc/00264/37569/
long_lat ENVELOPE(8.610,8.610,62.837,62.837)
ENVELOPE(-86.200,-86.200,-77.800,-77.800)
geographic Hulu
Indian
Reimer
geographic_facet Hulu
Indian
Reimer
genre Planktonic foraminifera
genre_facet Planktonic foraminifera
op_source Radiocarbon (0033-8222) (Univ Arizona Dept Geosciences), 2013 , Vol. 55 , N. 4 , P. 1999-2019
op_relation https://archimer.ifremer.fr/doc/00264/37569/35852.pdf
doi:2013 by the Arizona Board of Regents on behalf of the University of Arizona
https://archimer.ifremer.fr/doc/00264/37569/
op_rights info:eu-repo/semantics/openAccess
restricted use
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