Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships
Paleoceanographic and stratigraphic methods, based on high-resolution compressional wave (p-wave) velocity measurements, have been applied to the studies of late Quaternary deep-sea carbonates in the western and eastern equatorial Atlantic. The measurements provide sonostratigraphic records in which...
Published in: | Marine Geology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
1988
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/33583/ https://oceanrep.geomar.de/id/eprint/33583/1/Mienert.pdf https://doi.org/10.1016/0025-3227(88)90048-5 |
id |
ftoceanrep:oai:oceanrep.geomar.de:33583 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:33583 2023-05-15T18:00:58+02:00 Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships Mienert, Jürgen Curry, William B. Sarnthein, Michael 1988 text https://oceanrep.geomar.de/id/eprint/33583/ https://oceanrep.geomar.de/id/eprint/33583/1/Mienert.pdf https://doi.org/10.1016/0025-3227(88)90048-5 en eng Elsevier https://oceanrep.geomar.de/id/eprint/33583/1/Mienert.pdf Mienert, J., Curry, W. B. and Sarnthein, M. (1988) Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships. Marine Geology, 83 . pp. 9-20. DOI 10.1016/0025-3227(88)90048-5 <https://doi.org/10.1016/0025-3227%2888%2990048-5>. doi:10.1016/0025-3227(88)90048-5 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1988 ftoceanrep https://doi.org/10.1016/0025-3227(88)90048-5 2023-04-07T15:26:56Z Paleoceanographic and stratigraphic methods, based on high-resolution compressional wave (p-wave) velocity measurements, have been applied to the studies of late Quaternary deep-sea carbonates in the western and eastern equatorial Atlantic. The measurements provide sonostratigraphic records in which changes in p-wave velocity parallel the changes from a glacial to an interglacial climate: Maxima in p-wave velocity (greater than 1540 m/s) occur during interglacial oxygen isotope stages 1, 5 and 7. Minima (1490 m/s) occur during glacial oxygen isotope stages 2, 4 and 6. Changes in p-wave velocity parallel past changes in carbonate accumulation and sediment coarse fraction, and allow a detailed core to core correlation. From these results two main patterns emerge: (1) In cores from shallower than 4300 m and from well above the present lysocline, large temporal changes in p-wave velocity parallel the production of planktonic foraminifera and the climatic history recorded in the sediments, and (2) below 4300 m, the position of the foraminiferal lysocline in the western equatorial Atlantic, large downcore p-wave velocity fluctuations gradually disappear due to dissolution of carbonate sediments. Dissolution also causes a distinct decrease in p-wave velocity and acoustic reflectivity in surface sediments across the present foraminiferal lysocline. Thus, past changes in the position of the foraminiferal lysocline or calcite compensation depth that caused distinct changes in reflectivity of sediments should lead to distinct reflectors within sediment columns. Their distribution can be utilized to map paleowater masses with different degrees of carbonate saturation. Article in Journal/Newspaper Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Marine Geology 83 1-4 9 20 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Paleoceanographic and stratigraphic methods, based on high-resolution compressional wave (p-wave) velocity measurements, have been applied to the studies of late Quaternary deep-sea carbonates in the western and eastern equatorial Atlantic. The measurements provide sonostratigraphic records in which changes in p-wave velocity parallel the changes from a glacial to an interglacial climate: Maxima in p-wave velocity (greater than 1540 m/s) occur during interglacial oxygen isotope stages 1, 5 and 7. Minima (1490 m/s) occur during glacial oxygen isotope stages 2, 4 and 6. Changes in p-wave velocity parallel past changes in carbonate accumulation and sediment coarse fraction, and allow a detailed core to core correlation. From these results two main patterns emerge: (1) In cores from shallower than 4300 m and from well above the present lysocline, large temporal changes in p-wave velocity parallel the production of planktonic foraminifera and the climatic history recorded in the sediments, and (2) below 4300 m, the position of the foraminiferal lysocline in the western equatorial Atlantic, large downcore p-wave velocity fluctuations gradually disappear due to dissolution of carbonate sediments. Dissolution also causes a distinct decrease in p-wave velocity and acoustic reflectivity in surface sediments across the present foraminiferal lysocline. Thus, past changes in the position of the foraminiferal lysocline or calcite compensation depth that caused distinct changes in reflectivity of sediments should lead to distinct reflectors within sediment columns. Their distribution can be utilized to map paleowater masses with different degrees of carbonate saturation. |
format |
Article in Journal/Newspaper |
author |
Mienert, Jürgen Curry, William B. Sarnthein, Michael |
spellingShingle |
Mienert, Jürgen Curry, William B. Sarnthein, Michael Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships |
author_facet |
Mienert, Jürgen Curry, William B. Sarnthein, Michael |
author_sort |
Mienert, Jürgen |
title |
Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships |
title_short |
Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships |
title_full |
Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships |
title_fullStr |
Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships |
title_full_unstemmed |
Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships |
title_sort |
sonostratigraphic records from equatorial atlantic deep-sea carbonates: paleoceanographic and climatic relationships |
publisher |
Elsevier |
publishDate |
1988 |
url |
https://oceanrep.geomar.de/id/eprint/33583/ https://oceanrep.geomar.de/id/eprint/33583/1/Mienert.pdf https://doi.org/10.1016/0025-3227(88)90048-5 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/33583/1/Mienert.pdf Mienert, J., Curry, W. B. and Sarnthein, M. (1988) Sonostratigraphic records from equatorial atlantic deep-sea carbonates: Paleoceanographic and climatic relationships. Marine Geology, 83 . pp. 9-20. DOI 10.1016/0025-3227(88)90048-5 <https://doi.org/10.1016/0025-3227%2888%2990048-5>. doi:10.1016/0025-3227(88)90048-5 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/0025-3227(88)90048-5 |
container_title |
Marine Geology |
container_volume |
83 |
container_issue |
1-4 |
container_start_page |
9 |
op_container_end_page |
20 |
_version_ |
1766170273250279424 |