Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic
Sediments recovered at ODP Site 1262 on Walvis Ridge (eastern South Atlantic Ocean, paleodepth ~2500–3000 m) offer an opportunity to look into the nature and cause(s) of the benthic foraminiferal turnover across the Cretaceous/Paleogene (K/Pg) boundary at abyssal depths at a location relatively remo...
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Format: | Dataset |
Language: | English |
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PANGAEA
2007
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.672083 https://doi.org/10.1594/PANGAEA.672083 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.672083 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
208-1262 Alabamina creta Alabamina sp. Allomorphina velascoensis Ammodiscus sp. Angulogavelinella avnimelechi Anomalinoides affinis Anomalinoides ammonoides Anomalinoides sp. Anomalinoides spp. Aragonia velascoensis Arenobulimina truncata Astacolus spp. Bolivina cf. huneri Bolivinoides decoratus Bolivinoides delicatulus Buchnerina sp. Bulimina cf. alazanensis Bulimina kugleri Bulimina midwayensis Bulimina paleocenica Bulimina spp. Bulimina trinitatensis Bulimina velascoensis Buliminella beaumonti Buliminella sp. Caudammina ovula Cibicidoides cf. dayi Cibicidoides cf. naranjoensis Cibicidoides howelli Cibicidoides hyphalus Cibicidoides pseudoacutus Cibicidoides sp. Cibicidoides velascoensis Clavulinoides amorpha Clavulinoides sp. COMPCORE Composite Core Coryphostoma spp. Counting >63 µm fraction DEPTH sediment/rock Dorothia bulletta Dorothia spp. Dorothia trochoides DSDP/ODP/IODP sample designation Ellipsodimorphina spp. Eouvigerina sp. Fishers alpha index of diversity Fissurina spp. |
spellingShingle |
208-1262 Alabamina creta Alabamina sp. Allomorphina velascoensis Ammodiscus sp. Angulogavelinella avnimelechi Anomalinoides affinis Anomalinoides ammonoides Anomalinoides sp. Anomalinoides spp. Aragonia velascoensis Arenobulimina truncata Astacolus spp. Bolivina cf. huneri Bolivinoides decoratus Bolivinoides delicatulus Buchnerina sp. Bulimina cf. alazanensis Bulimina kugleri Bulimina midwayensis Bulimina paleocenica Bulimina spp. Bulimina trinitatensis Bulimina velascoensis Buliminella beaumonti Buliminella sp. Caudammina ovula Cibicidoides cf. dayi Cibicidoides cf. naranjoensis Cibicidoides howelli Cibicidoides hyphalus Cibicidoides pseudoacutus Cibicidoides sp. Cibicidoides velascoensis Clavulinoides amorpha Clavulinoides sp. COMPCORE Composite Core Coryphostoma spp. Counting >63 µm fraction DEPTH sediment/rock Dorothia bulletta Dorothia spp. Dorothia trochoides DSDP/ODP/IODP sample designation Ellipsodimorphina spp. Eouvigerina sp. Fishers alpha index of diversity Fissurina spp. Alegret, Laia Thomas, Ellen Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic |
topic_facet |
208-1262 Alabamina creta Alabamina sp. Allomorphina velascoensis Ammodiscus sp. Angulogavelinella avnimelechi Anomalinoides affinis Anomalinoides ammonoides Anomalinoides sp. Anomalinoides spp. Aragonia velascoensis Arenobulimina truncata Astacolus spp. Bolivina cf. huneri Bolivinoides decoratus Bolivinoides delicatulus Buchnerina sp. Bulimina cf. alazanensis Bulimina kugleri Bulimina midwayensis Bulimina paleocenica Bulimina spp. Bulimina trinitatensis Bulimina velascoensis Buliminella beaumonti Buliminella sp. Caudammina ovula Cibicidoides cf. dayi Cibicidoides cf. naranjoensis Cibicidoides howelli Cibicidoides hyphalus Cibicidoides pseudoacutus Cibicidoides sp. Cibicidoides velascoensis Clavulinoides amorpha Clavulinoides sp. COMPCORE Composite Core Coryphostoma spp. Counting >63 µm fraction DEPTH sediment/rock Dorothia bulletta Dorothia spp. Dorothia trochoides DSDP/ODP/IODP sample designation Ellipsodimorphina spp. Eouvigerina sp. Fishers alpha index of diversity Fissurina spp. |
description |
Sediments recovered at ODP Site 1262 on Walvis Ridge (eastern South Atlantic Ocean, paleodepth ~2500–3000 m) offer an opportunity to look into the nature and cause(s) of the benthic foraminiferal turnover across the Cretaceous/Paleogene (K/Pg) boundary at abyssal depths at a location relatively remote from the location of the asteroid impact on the Yucatan peninsula. Late Maastrichtian assemblages were diverse and heterogeneous, reflecting oligo- to mesotrophic conditions at the sea floor. As at other locations, there was no significant extinction of benthic foraminiferal species at the K/Pg boundary, but the diversity and heterogeneity of the assemblages decreased precipitously. The percentage of infaunal buliminid taxa decreased rapidly, but the total percentage of infaunal taxa remained essentially unchanged. Benthic foraminiferal accumulation rates (BFAR) dropped at the boundary itself, and fluctuated strongly later in the Danian. After the K/Pg boundary, opportunistic taxa increased in relative abundance, and diversity and heterogeneity strongly fluctuated. There thus is no clear agreement between three proxies which have been used to indicate a high food supply to the sea floor: percentage buliminids, percentage infaunal taxa, and BFAR. This discrepancy might indicate that the food supply changed in character (e.g., type of food, temporal variability in flux), but did not show a long-term, large net change in total amount. The strong fluctuations in BFAR, heterogeneity and diversity indicate that environmental instability started at the K/Pg boundary, and persisted through planktic foraminiferal zones P* and P1a. In lower planktic foraminiferal zone P1b, agglutinated species of the genera Spiroplectammina and Clavulinoides, thought to be infaunal and indicative of increasing levels of food supply, increased in relative abundance while the relative abundance of buliminids remained low. Possibly, agglutinated taxa took over at least part of the infaunal niche in the Paleocene, as a result of the rise in the ... |
format |
Dataset |
author |
Alegret, Laia Thomas, Ellen |
author_facet |
Alegret, Laia Thomas, Ellen |
author_sort |
Alegret, Laia |
title |
Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic |
title_short |
Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic |
title_full |
Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic |
title_fullStr |
Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic |
title_full_unstemmed |
Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic |
title_sort |
benthic foraminiferal assemblages across the cretaceous paleogene boundray of odp site 208-1262 on walvis ridge, eastern south atlantic |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.672083 https://doi.org/10.1594/PANGAEA.672083 |
op_coverage |
LATITUDE: -27.185833 * LONGITUDE: 1.577000 * DATE/TIME START: 2003-03-24T00:00:00 * DATE/TIME END: 2003-03-29T00:00:00 * MINIMUM DEPTH, sediment/rock: 210.30 m * MAXIMUM DEPTH, sediment/rock: 221.50 m |
long_lat |
ENVELOPE(1.577000,1.577000,-27.185833,-27.185833) |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Supplement to: Alegret, Laia; Thomas, Ellen (2007): Deep-Sea environments across the Cretaceous/Paleogene boundary in the eastern South Atlantic Ocean (ODP Leg 208, Walvis Ridge). Marine Micropaleontology, 64(3-4), 1-17, https://doi.org/10.1016/j.marmicro.2006.12.003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.672083 https://doi.org/10.1594/PANGAEA.672083 |
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.67208310.1016/j.marmicro.2006.12.003 |
_version_ |
1810480212674084864 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.672083 2024-09-15T18:36:32+00:00 Benthic foraminiferal assemblages across the Cretaceous Paleogene boundray of ODP Site 208-1262 on Walvis Ridge, eastern South Atlantic Alegret, Laia Thomas, Ellen LATITUDE: -27.185833 * LONGITUDE: 1.577000 * DATE/TIME START: 2003-03-24T00:00:00 * DATE/TIME END: 2003-03-29T00:00:00 * MINIMUM DEPTH, sediment/rock: 210.30 m * MAXIMUM DEPTH, sediment/rock: 221.50 m 2007 text/tab-separated-values, 4719 data points https://doi.pangaea.de/10.1594/PANGAEA.672083 https://doi.org/10.1594/PANGAEA.672083 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.672083 https://doi.org/10.1594/PANGAEA.672083 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Alegret, Laia; Thomas, Ellen (2007): Deep-Sea environments across the Cretaceous/Paleogene boundary in the eastern South Atlantic Ocean (ODP Leg 208, Walvis Ridge). Marine Micropaleontology, 64(3-4), 1-17, https://doi.org/10.1016/j.marmicro.2006.12.003 208-1262 Alabamina creta Alabamina sp. Allomorphina velascoensis Ammodiscus sp. Angulogavelinella avnimelechi Anomalinoides affinis Anomalinoides ammonoides Anomalinoides sp. Anomalinoides spp. Aragonia velascoensis Arenobulimina truncata Astacolus spp. Bolivina cf. huneri Bolivinoides decoratus Bolivinoides delicatulus Buchnerina sp. Bulimina cf. alazanensis Bulimina kugleri Bulimina midwayensis Bulimina paleocenica Bulimina spp. Bulimina trinitatensis Bulimina velascoensis Buliminella beaumonti Buliminella sp. Caudammina ovula Cibicidoides cf. dayi Cibicidoides cf. naranjoensis Cibicidoides howelli Cibicidoides hyphalus Cibicidoides pseudoacutus Cibicidoides sp. Cibicidoides velascoensis Clavulinoides amorpha Clavulinoides sp. COMPCORE Composite Core Coryphostoma spp. Counting >63 µm fraction DEPTH sediment/rock Dorothia bulletta Dorothia spp. Dorothia trochoides DSDP/ODP/IODP sample designation Ellipsodimorphina spp. Eouvigerina sp. Fishers alpha index of diversity Fissurina spp. dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.67208310.1016/j.marmicro.2006.12.003 2024-07-24T02:31:29Z Sediments recovered at ODP Site 1262 on Walvis Ridge (eastern South Atlantic Ocean, paleodepth ~2500–3000 m) offer an opportunity to look into the nature and cause(s) of the benthic foraminiferal turnover across the Cretaceous/Paleogene (K/Pg) boundary at abyssal depths at a location relatively remote from the location of the asteroid impact on the Yucatan peninsula. Late Maastrichtian assemblages were diverse and heterogeneous, reflecting oligo- to mesotrophic conditions at the sea floor. As at other locations, there was no significant extinction of benthic foraminiferal species at the K/Pg boundary, but the diversity and heterogeneity of the assemblages decreased precipitously. The percentage of infaunal buliminid taxa decreased rapidly, but the total percentage of infaunal taxa remained essentially unchanged. Benthic foraminiferal accumulation rates (BFAR) dropped at the boundary itself, and fluctuated strongly later in the Danian. After the K/Pg boundary, opportunistic taxa increased in relative abundance, and diversity and heterogeneity strongly fluctuated. There thus is no clear agreement between three proxies which have been used to indicate a high food supply to the sea floor: percentage buliminids, percentage infaunal taxa, and BFAR. This discrepancy might indicate that the food supply changed in character (e.g., type of food, temporal variability in flux), but did not show a long-term, large net change in total amount. The strong fluctuations in BFAR, heterogeneity and diversity indicate that environmental instability started at the K/Pg boundary, and persisted through planktic foraminiferal zones P* and P1a. In lower planktic foraminiferal zone P1b, agglutinated species of the genera Spiroplectammina and Clavulinoides, thought to be infaunal and indicative of increasing levels of food supply, increased in relative abundance while the relative abundance of buliminids remained low. Possibly, agglutinated taxa took over at least part of the infaunal niche in the Paleocene, as a result of the rise in the ... Dataset South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(1.577000,1.577000,-27.185833,-27.185833) |