Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements
The cause of the climatically controlled fluctuations in the carbonate content of deep-sea sediments remains the subject of uncertainty and debate. Three variables are involved: supply of biogenic carbonate, loss by dissolution, and dilution by non-carbonate phases. It is suggested that 230Th, which...
Published in: | Chemical Geology |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
1984
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/33317/ https://oceanrep.geomar.de/id/eprint/33317/1/Bacon.pdf https://doi.org/10.1016/0009-2541(84)90183-9 |
id |
ftoceanrep:oai:oceanrep.geomar.de:33317 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:33317 2023-05-15T17:32:52+02:00 Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements Bacon, Michael P. 1984 text https://oceanrep.geomar.de/id/eprint/33317/ https://oceanrep.geomar.de/id/eprint/33317/1/Bacon.pdf https://doi.org/10.1016/0009-2541(84)90183-9 en eng Elsevier https://oceanrep.geomar.de/id/eprint/33317/1/Bacon.pdf Bacon, M. P. (1984) Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements. Isotope Geoscience, 46 (2). pp. 97-111. DOI 10.1016/0009-2541(84)90183-9 <https://doi.org/10.1016/0009-2541%2884%2990183-9>. doi:10.1016/0009-2541(84)90183-9 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1984 ftoceanrep https://doi.org/10.1016/0009-2541(84)90183-9 2023-04-07T15:26:30Z The cause of the climatically controlled fluctuations in the carbonate content of deep-sea sediments remains the subject of uncertainty and debate. Three variables are involved: supply of biogenic carbonate, loss by dissolution, and dilution by non-carbonate phases. It is suggested that 230Th, which is produced in the ocean at a constant rate provides a reliable reference for measuring variations in rate of sedimentation on a regional scale. Results of a preliminary analysis based on published data indicate that, for depths at and above the lysocline, the carbonate fluctuations observed in cores from the North Atlantic Ocean are due primarily to variations in the terrigenous clay input, which was 2–5 times higher during glacials than during interglacials. Carbonate deposition appears to have been somewhat reduced during glacials, but probably not by more than a factor of 2. From published 230Th232Th profiles it appears that the South Atlantic Ocean also received increased inputs of terrigenous clay during glacial periods. Article in Journal/Newspaper North Atlantic South Atlantic Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Chemical Geology 46 2 97 111 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The cause of the climatically controlled fluctuations in the carbonate content of deep-sea sediments remains the subject of uncertainty and debate. Three variables are involved: supply of biogenic carbonate, loss by dissolution, and dilution by non-carbonate phases. It is suggested that 230Th, which is produced in the ocean at a constant rate provides a reliable reference for measuring variations in rate of sedimentation on a regional scale. Results of a preliminary analysis based on published data indicate that, for depths at and above the lysocline, the carbonate fluctuations observed in cores from the North Atlantic Ocean are due primarily to variations in the terrigenous clay input, which was 2–5 times higher during glacials than during interglacials. Carbonate deposition appears to have been somewhat reduced during glacials, but probably not by more than a factor of 2. From published 230Th232Th profiles it appears that the South Atlantic Ocean also received increased inputs of terrigenous clay during glacial periods. |
format |
Article in Journal/Newspaper |
author |
Bacon, Michael P. |
spellingShingle |
Bacon, Michael P. Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements |
author_facet |
Bacon, Michael P. |
author_sort |
Bacon, Michael P. |
title |
Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements |
title_short |
Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements |
title_full |
Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements |
title_fullStr |
Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements |
title_full_unstemmed |
Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements |
title_sort |
glacial to interglacial changes in carbonate and clay sedimentation in the atlantic ocean estimated from 230th measurements |
publisher |
Elsevier |
publishDate |
1984 |
url |
https://oceanrep.geomar.de/id/eprint/33317/ https://oceanrep.geomar.de/id/eprint/33317/1/Bacon.pdf https://doi.org/10.1016/0009-2541(84)90183-9 |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/33317/1/Bacon.pdf Bacon, M. P. (1984) Glacial to interglacial changes in carbonate and clay sedimentation in the Atlantic Ocean estimated from 230Th measurements. Isotope Geoscience, 46 (2). pp. 97-111. DOI 10.1016/0009-2541(84)90183-9 <https://doi.org/10.1016/0009-2541%2884%2990183-9>. doi:10.1016/0009-2541(84)90183-9 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/0009-2541(84)90183-9 |
container_title |
Chemical Geology |
container_volume |
46 |
container_issue |
2 |
container_start_page |
97 |
op_container_end_page |
111 |
_version_ |
1766131173880233984 |