Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events
We report oxygen and carbon isotope results of detrital carbonate grains from Heinrich layers at three sites in the North Atlantic located along a transect from the Labrador Sea to the eastern North Atlantic. Oxygen isotopic values of individual detrital carbonate grains from six Heinrich layers at...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:2274 2023-05-15T17:06:11+02:00 Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events Hodell, David A. Curtis, Jason H. 2008-10 application/pdf http://eprints.esc.cam.ac.uk/2274/ http://eprints.esc.cam.ac.uk/2274/1/hodell.pdf http://elsevier-apps.sciverse.com/GoogleMaps/index.jsp?doi=10.1016/j.margeo.2008.09.010 https://doi.org/10.1016/j.margeo.2008.09.010 en eng http://eprints.esc.cam.ac.uk/2274/1/hodell.pdf Hodell, David A. and Curtis, Jason H. (2008) Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events. Marine Geology, 256 (1-4). pp. 30-35. DOI https://doi.org/10.1016/j.margeo.2008.09.010 <https://doi.org/10.1016/j.margeo.2008.09.010> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2008 ftucambridgeesc https://doi.org/10.1016/j.margeo.2008.09.010 2020-08-27T18:09:13Z We report oxygen and carbon isotope results of detrital carbonate grains from Heinrich layers at three sites in the North Atlantic located along a transect from the Labrador Sea to the eastern North Atlantic. Oxygen isotopic values of individual detrital carbonate grains from six Heinrich layers at all sites average − 5.6‰ ± 1.5‰ (1σ; n = 166), reflecting values of dolomitic limestone derived from source areas in northeastern Canada. The δ18O of bulk carbonate at Integrated Ocean Drilling Program (IODP) Site U1308 (re-occupation of Deep Sea Drilling Project (DSDP) Site 609) in the eastern North Atlantic records the proportion of detrital to biogenic carbonate and δ18O decreases to − 5‰ during Heinrich (H) events 1, 2, 4 and 5 relative to a background value of ∼ 1 to 2‰ for biogenic carbonate. Bulk δ18O also decreases during H3 and H6 but only attains values of − 1‰, indicating either a greater proportion of biogenic-to-detrital carbonate or a different source. Because the δ18O of detrital carbonate is ∼ 9‰ lower than foraminifer carbonate, any fine-grained detrital carbonate not removed from the inner test chambers will lower foraminifer δ18O. We conclude bulk carbonate δ18O is a sensitive proxy for detrital carbonate and may be useful for identifying Heinrich layers in cores within and near the margins of the North Atlantic ice-rafted detritus (IRD) belt. Article in Journal/Newspaper Labrador Sea North Atlantic University of Cambridge, Department of Earth Sciences: ESC Publications Canada Marine Geology 256 1-4 30 35 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Hodell, David A. Curtis, Jason H. Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
We report oxygen and carbon isotope results of detrital carbonate grains from Heinrich layers at three sites in the North Atlantic located along a transect from the Labrador Sea to the eastern North Atlantic. Oxygen isotopic values of individual detrital carbonate grains from six Heinrich layers at all sites average − 5.6‰ ± 1.5‰ (1σ; n = 166), reflecting values of dolomitic limestone derived from source areas in northeastern Canada. The δ18O of bulk carbonate at Integrated Ocean Drilling Program (IODP) Site U1308 (re-occupation of Deep Sea Drilling Project (DSDP) Site 609) in the eastern North Atlantic records the proportion of detrital to biogenic carbonate and δ18O decreases to − 5‰ during Heinrich (H) events 1, 2, 4 and 5 relative to a background value of ∼ 1 to 2‰ for biogenic carbonate. Bulk δ18O also decreases during H3 and H6 but only attains values of − 1‰, indicating either a greater proportion of biogenic-to-detrital carbonate or a different source. Because the δ18O of detrital carbonate is ∼ 9‰ lower than foraminifer carbonate, any fine-grained detrital carbonate not removed from the inner test chambers will lower foraminifer δ18O. We conclude bulk carbonate δ18O is a sensitive proxy for detrital carbonate and may be useful for identifying Heinrich layers in cores within and near the margins of the North Atlantic ice-rafted detritus (IRD) belt. |
format |
Article in Journal/Newspaper |
author |
Hodell, David A. Curtis, Jason H. |
author_facet |
Hodell, David A. Curtis, Jason H. |
author_sort |
Hodell, David A. |
title |
Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events |
title_short |
Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events |
title_full |
Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events |
title_fullStr |
Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events |
title_full_unstemmed |
Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events |
title_sort |
oxygen and carbon isotopes of detrital carbonate in north atlantic heinrich events |
publishDate |
2008 |
url |
http://eprints.esc.cam.ac.uk/2274/ http://eprints.esc.cam.ac.uk/2274/1/hodell.pdf http://elsevier-apps.sciverse.com/GoogleMaps/index.jsp?doi=10.1016/j.margeo.2008.09.010 https://doi.org/10.1016/j.margeo.2008.09.010 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
http://eprints.esc.cam.ac.uk/2274/1/hodell.pdf Hodell, David A. and Curtis, Jason H. (2008) Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events. Marine Geology, 256 (1-4). pp. 30-35. DOI https://doi.org/10.1016/j.margeo.2008.09.010 <https://doi.org/10.1016/j.margeo.2008.09.010> |
op_doi |
https://doi.org/10.1016/j.margeo.2008.09.010 |
container_title |
Marine Geology |
container_volume |
256 |
container_issue |
1-4 |
container_start_page |
30 |
op_container_end_page |
35 |
_version_ |
1766061197277265920 |