Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland
Five short cores sub-sampled from box cores from three sites in the eastern Weddell Sea off Antarctica and in the eastern Pacific off southern California, covering a range in water depth from 500 to 2000 m, were analysed for the down-core distribution of live (stained with Rose Bengal) and dead bent...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1989
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.710895 https://doi.org/10.1594/PANGAEA.710895 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.710895 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.710895 2024-05-19T07:31:37+00:00 Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland Mackensen, Andreas Douglas, Robert G MEDIAN LATITUDE: -11.074029 * MEDIAN LONGITUDE: -70.497375 * SOUTH-BOUND LATITUDE: -70.100000 * WEST-BOUND LONGITUDE: -118.783300 * NORTH-BOUND LATITUDE: 33.566700 * EAST-BOUND LONGITUDE: -6.681660 * DATE/TIME START: 1985-12-31T06:32:00 * DATE/TIME END: 1985-12-31T09:15:00 1989 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.710895 https://doi.org/10.1594/PANGAEA.710895 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.710895 https://doi.org/10.1594/PANGAEA.710895 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Mackensen, Andreas; Douglas, Robert G (1989): Down-core distribution of live and dead deep-water benthic foraminifera in box cores from the Weddell Sea and the California continental borderland. Deep-Sea Research Part A. Oceanographic Research Papers, 36(6), 879-900, https://doi.org/10.1016/0198-0149(89)90034-4 ANT-IV/3 Atka Bay AWI_Paleo BC Box corer California Basins Giant box corer GKG Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS08 PS08/374 PS1394-1 PS1394-3 SW_2b SW_3a SW_3b Dataset 1989 ftpangaea https://doi.org/10.1594/PANGAEA.71089510.1016/0198-0149(89)90034-4 2024-04-23T23:36:33Z Five short cores sub-sampled from box cores from three sites in the eastern Weddell Sea off Antarctica and in the eastern Pacific off southern California, covering a range in water depth from 500 to 2000 m, were analysed for the down-core distribution of live (stained with Rose Bengal) and dead benthic foraminifera. In the California continental borderland, Planulina ariminensis, Rosalina columbiensis and Trochammina spp. live attached to agglutinated polychaetes tubes that rise above the sedimentwater interface. Bolivina spissa lives exclusively in or on the uppermost sediment. Stained specimens of Chilostomella ovoidea are found down to 6 cm within the sediment and specimens of Globobulimina pacifica down to a maximum of 8 cm. Delta13C values of live G. pacifica decrease with increasing depth from the sediment surface down to 7 cm core depth, indicating that this infaunal species utilizes13C-depleted carbon from pore waters. In the dead, predominantly calcareous benthic forminiferal assemblage, selective dissolution of small delicate tests in the upper sediment column causes a continuous variation in species proportions. In the eastern Weddell Sea, the calcareous Bulimina aculeata lives in a carbonate corrosive environment exclusively in or on the uppermost sediment. The arenaceous Cribrostomoides subglobosum, Recurvoides contortus and some Reophax species are frequently found within the top 4 cm of the sediment, whereas stained specimens of Haplophragmoides bradyi, Glomospira charoides and Cribrostomoides wiesneri occur in maximum abundance below the uppermost 1.5 cm. Species proportions in the dead, predominantly arenaceous, benthic foraminiferal assemblage change in three distinct steps. The first change is caused by calcite dissolution at the sediment-water interface, the second coincides with the lower boundary of intense bioturbation, and the third results from the geochemical shift from oxidizing to reducing conditions below a compacted ash layer. Dataset Antarc* Antarctica Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-118.783300,-6.681660,33.566700,-70.100000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-IV/3 Atka Bay AWI_Paleo BC Box corer California Basins Giant box corer GKG Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS08 PS08/374 PS1394-1 PS1394-3 SW_2b SW_3a SW_3b |
spellingShingle |
ANT-IV/3 Atka Bay AWI_Paleo BC Box corer California Basins Giant box corer GKG Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS08 PS08/374 PS1394-1 PS1394-3 SW_2b SW_3a SW_3b Mackensen, Andreas Douglas, Robert G Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland |
topic_facet |
ANT-IV/3 Atka Bay AWI_Paleo BC Box corer California Basins Giant box corer GKG Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS08 PS08/374 PS1394-1 PS1394-3 SW_2b SW_3a SW_3b |
description |
Five short cores sub-sampled from box cores from three sites in the eastern Weddell Sea off Antarctica and in the eastern Pacific off southern California, covering a range in water depth from 500 to 2000 m, were analysed for the down-core distribution of live (stained with Rose Bengal) and dead benthic foraminifera. In the California continental borderland, Planulina ariminensis, Rosalina columbiensis and Trochammina spp. live attached to agglutinated polychaetes tubes that rise above the sedimentwater interface. Bolivina spissa lives exclusively in or on the uppermost sediment. Stained specimens of Chilostomella ovoidea are found down to 6 cm within the sediment and specimens of Globobulimina pacifica down to a maximum of 8 cm. Delta13C values of live G. pacifica decrease with increasing depth from the sediment surface down to 7 cm core depth, indicating that this infaunal species utilizes13C-depleted carbon from pore waters. In the dead, predominantly calcareous benthic forminiferal assemblage, selective dissolution of small delicate tests in the upper sediment column causes a continuous variation in species proportions. In the eastern Weddell Sea, the calcareous Bulimina aculeata lives in a carbonate corrosive environment exclusively in or on the uppermost sediment. The arenaceous Cribrostomoides subglobosum, Recurvoides contortus and some Reophax species are frequently found within the top 4 cm of the sediment, whereas stained specimens of Haplophragmoides bradyi, Glomospira charoides and Cribrostomoides wiesneri occur in maximum abundance below the uppermost 1.5 cm. Species proportions in the dead, predominantly arenaceous, benthic foraminiferal assemblage change in three distinct steps. The first change is caused by calcite dissolution at the sediment-water interface, the second coincides with the lower boundary of intense bioturbation, and the third results from the geochemical shift from oxidizing to reducing conditions below a compacted ash layer. |
format |
Dataset |
author |
Mackensen, Andreas Douglas, Robert G |
author_facet |
Mackensen, Andreas Douglas, Robert G |
author_sort |
Mackensen, Andreas |
title |
Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland |
title_short |
Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland |
title_full |
Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland |
title_fullStr |
Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland |
title_full_unstemmed |
Down-core distribution of live and dead benthic foraminifera in deep sea sediments from the Weddell Sea and the Californian continental borderland |
title_sort |
down-core distribution of live and dead benthic foraminifera in deep sea sediments from the weddell sea and the californian continental borderland |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.710895 https://doi.org/10.1594/PANGAEA.710895 |
op_coverage |
MEDIAN LATITUDE: -11.074029 * MEDIAN LONGITUDE: -70.497375 * SOUTH-BOUND LATITUDE: -70.100000 * WEST-BOUND LONGITUDE: -118.783300 * NORTH-BOUND LATITUDE: 33.566700 * EAST-BOUND LONGITUDE: -6.681660 * DATE/TIME START: 1985-12-31T06:32:00 * DATE/TIME END: 1985-12-31T09:15:00 |
long_lat |
ENVELOPE(-118.783300,-6.681660,33.566700,-70.100000) |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_source |
Supplement to: Mackensen, Andreas; Douglas, Robert G (1989): Down-core distribution of live and dead deep-water benthic foraminifera in box cores from the Weddell Sea and the California continental borderland. Deep-Sea Research Part A. Oceanographic Research Papers, 36(6), 879-900, https://doi.org/10.1016/0198-0149(89)90034-4 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.710895 https://doi.org/10.1594/PANGAEA.710895 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.71089510.1016/0198-0149(89)90034-4 |
_version_ |
1799469473239924736 |