Benthic foraminiferal abundances at the Cretaceous/Paleogene boundary of ODP Hole 117-1049C at Blake Nose, Northwest Atlantic (Appendix A)
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2004
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| _version_ | 1867169952140623872 |
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| author | Alegret, Laia Thomas, Ellen |
| author_facet | Alegret, Laia Thomas, Ellen |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sediments recovered at lower bathyal ODP Site 1049 on Blake Nose (Northwestern Atlantic) offer an opportunity to study environmental changes at the Cretaceous/Paleogene (K/P) boundary relatively close to the Chicxulub impact structure on the Yucatan peninsula, Mexico. In Hole 1049C, the boundary is located at the base of a 9-cm-thick layer with abundant spherules, considered to be impact ejecta. Uppermost Maastrichtian oozes below, and lowermost Danian pelagic oozes above the spherulebed contain well-preserved bathyal benthic foraminifera. The spherule-bed itself, in contrast, contains a mixture of shallow (neritic) and deeper (bathyal) species, and specimens vary strongly in preservation. This assemblage was probably formed by reworking and down-slope transport triggered by the K/P impact. Across the spherule-bed (i.e., the K/P boundary) only ~7% of benthic foraminiferal species became extinct, similar to the low extinction rates of benthic foraminifera worldwide. Quantitative analysis of benthic foraminiferal assemblages and morphogroups in the >63-µm size fraction indicates a relatively eutrophic, stable environment during the latest Maastrichtian, interrupted by a sudden decrease in the food supply to the benthos at the K/P boundary and a decrease in diversity of the faunas, followed by a stepped recovery during the earliest Danian. The recovery was probably linked to the gradual recovery of surface-dwelling primary producers. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_695112 |
| institution | PANGAEA |
| language | en |
| publishDate | 2004 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Benthic foraminiferal abundances at the Cretaceous/Paleogene boundary of ODP Hole 117-1049C at Blake Nose, Northwest Atlantic (Appendix A) Alegret, Laia Thomas, Ellen 171-1049C; Alabamina midwayensis; Alabamina spp.; Alabamina wilcoxensis; Allomorphina sp.; Allomorphina velascoensis; Ammodiscus sp.; Anomalinoides acuta; Anomalinoides affinis; Anomalinoides ammonoides; Anomalinoides rubiginosus; Anomalinoides spp.; Aragonia velascoensis; Arenobulimina truncata; Astacolus spp.; Bifarina spp.; Blake Nose, North Atlantic Ocean; Bolivinoides delicatulus; Bolivinoides draco; Bulimina kugleri; Bulimina midwayensis; Bulimina paleocenica; Bulimina spp.; Bulimina thanetensis; Bulimina trinitatensis; Bulimina velascoensis; Buliminella beaumonti; Buliminella grata; Buliminella sp.; Cibicidoides dayi; Cibicidoides ekblomi; Cibicidoides hyphalus; Cibicidoides proprius; Cibicidoides spp.; Cibicidoides velascoensis; Cibicidoides welleri; Clavulinoides amorpha; Clavulinoides spp.; Clavulinoides trilatera; Coryphostoma decurrens; Coryphostoma incrassata; Coryphostoma spp.; Coryphostomella sp.; Counting >63 µm fraction; DEPTH, sediment/rock; Dorothia bulletta; Dorothia spp.; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Ellipsodimorphina spp.; Eouvigerina sp.; Eouvigerina subsculptura; Fissurina spp.; Frondicularia sp.; Fursenkoina tegulata; Gaudryina laevigata; Gaudryina pyramidata; Gaudryina spp.; Glandulina sp.; Globorotalites sp.; Globorotalites spp.; Globulina prisca; Globulina spp.; Glomospirella grzybowskii; Guttulina sp.; Gyroidinoides acutus; Gyroidinoides beisseli; Gyroidinoides depressus; Gyroidinoides girardana; Gyroidinoides globosus; Gyroidinoides soldanii; Gyroidinoides sp.; Haplophragmoides sp.; Heronallenia lingulata; Joides Resolution; Lagena spp.; Leg171B; Lenticulina rotulata; Lenticulina spp.; Lingulina sp.; Marssonella oxycona; Marssonella spp.; Neocorbina sp.; Neoflabellina sp.; Nonionella cretacea; Nonionella robusta; Nonionella sp.; Nonion havanense; Nuttallides spp.; Nuttallides truempyi; Nuttallinella coronula; Nuttallinella florealis; Nuttallinella spp.; Ocean Drilling Program; ODP; Oolina spp.; Oridorsalis plummerae; Oridorsalis sp.; Oridorsalis umbonatus; Osangularia spp.; Osangularia velascoensis; Palliolatella sp.; Paralabamina cf. hillebrandti; Paralabamina hillebrandti; Paralabamina lunata; Paralabamina spp.; Pleurostomella aff. subnodosa; Pleurostomella sp.; Polymorphinella sp.; Praebulimina reussi; Praebulimina sp.; Pseudouvigerina plummerae; Pullenia cretacea; Pullenia jarvisi; Pyramidina rudita; Pyramidina sp.; Pyrulina spp.; Pyrulinoides sp.; Quadrimorphina allomorphinoides; Quadrimorphina spp.; Quinqueloculina sp.; Ramulina spp.; Reophax spp.; Reussella szajnochae; Rhizammina spp.; Sample code/label; Scheibnerova sp.; Seabrookia cretacea; Siphogenerinoides sp.; Sitella sp.; Sliteria varsoviensis; Spiroplectammina dentata; Spiroplectammina spectabilis; Spiroplectammina spp.; Stensioeina beccariiformis; Stensioeina excolata; Stilostomella spp.; Stilostomella subspinosa; Tappanina selmensis; Tappanina spp.; Uvigerina spp.; Vaginulina trilobata; Valvalabamina lenticula Sediments recovered at lower bathyal ODP Site 1049 on Blake Nose (Northwestern Atlantic) offer an opportunity to study environmental changes at the Cretaceous/Paleogene (K/P) boundary relatively close to the Chicxulub impact structure on the Yucatan peninsula, Mexico. In Hole 1049C, the boundary is located at the base of a 9-cm-thick layer with abundant spherules, considered to be impact ejecta. Uppermost Maastrichtian oozes below, and lowermost Danian pelagic oozes above the spherulebed contain well-preserved bathyal benthic foraminifera. The spherule-bed itself, in contrast, contains a mixture of shallow (neritic) and deeper (bathyal) species, and specimens vary strongly in preservation. This assemblage was probably formed by reworking and down-slope transport triggered by the K/P impact. Across the spherule-bed (i.e., the K/P boundary) only ~7% of benthic foraminiferal species became extinct, similar to the low extinction rates of benthic foraminifera worldwide. Quantitative analysis of benthic foraminiferal assemblages and morphogroups in the >63-µm size fraction indicates a relatively eutrophic, stable environment during the latest Maastrichtian, interrupted by a sudden decrease in the food supply to the benthos at the K/P boundary and a decrease in diversity of the faunas, followed by a stepped recovery during the earliest Danian. The recovery was probably linked to the gradual recovery of surface-dwelling primary producers. |
| title | Benthic foraminiferal abundances at the Cretaceous/Paleogene boundary of ODP Hole 117-1049C at Blake Nose, Northwest Atlantic (Appendix A) |
| topic | 171-1049C; Alabamina midwayensis; Alabamina spp.; Alabamina wilcoxensis; Allomorphina sp.; Allomorphina velascoensis; Ammodiscus sp.; Anomalinoides acuta; Anomalinoides affinis; Anomalinoides ammonoides; Anomalinoides rubiginosus; Anomalinoides spp.; Aragonia velascoensis; Arenobulimina truncata; Astacolus spp.; Bifarina spp.; Blake Nose, North Atlantic Ocean; Bolivinoides delicatulus; Bolivinoides draco; Bulimina kugleri; Bulimina midwayensis; Bulimina paleocenica; Bulimina spp.; Bulimina thanetensis; Bulimina trinitatensis; Bulimina velascoensis; Buliminella beaumonti; Buliminella grata; Buliminella sp.; Cibicidoides dayi; Cibicidoides ekblomi; Cibicidoides hyphalus; Cibicidoides proprius; Cibicidoides spp.; Cibicidoides velascoensis; Cibicidoides welleri; Clavulinoides amorpha; Clavulinoides spp.; Clavulinoides trilatera; Coryphostoma decurrens; Coryphostoma incrassata; Coryphostoma spp.; Coryphostomella sp.; Counting >63 µm fraction; DEPTH, sediment/rock; Dorothia bulletta; Dorothia spp.; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Ellipsodimorphina spp.; Eouvigerina sp.; Eouvigerina subsculptura; Fissurina spp.; Frondicularia sp.; Fursenkoina tegulata; Gaudryina laevigata; Gaudryina pyramidata; Gaudryina spp.; Glandulina sp.; Globorotalites sp.; Globorotalites spp.; Globulina prisca; Globulina spp.; Glomospirella grzybowskii; Guttulina sp.; Gyroidinoides acutus; Gyroidinoides beisseli; Gyroidinoides depressus; Gyroidinoides girardana; Gyroidinoides globosus; Gyroidinoides soldanii; Gyroidinoides sp.; Haplophragmoides sp.; Heronallenia lingulata; Joides Resolution; Lagena spp.; Leg171B; Lenticulina rotulata; Lenticulina spp.; Lingulina sp.; Marssonella oxycona; Marssonella spp.; Neocorbina sp.; Neoflabellina sp.; Nonionella cretacea; Nonionella robusta; Nonionella sp.; Nonion havanense; Nuttallides spp.; Nuttallides truempyi; Nuttallinella coronula; Nuttallinella florealis; Nuttallinella spp.; Ocean Drilling Program; ODP; Oolina spp.; Oridorsalis plummerae; Oridorsalis sp.; Oridorsalis umbonatus; Osangularia spp.; Osangularia velascoensis; Palliolatella sp.; Paralabamina cf. hillebrandti; Paralabamina hillebrandti; Paralabamina lunata; Paralabamina spp.; Pleurostomella aff. subnodosa; Pleurostomella sp.; Polymorphinella sp.; Praebulimina reussi; Praebulimina sp.; Pseudouvigerina plummerae; Pullenia cretacea; Pullenia jarvisi; Pyramidina rudita; Pyramidina sp.; Pyrulina spp.; Pyrulinoides sp.; Quadrimorphina allomorphinoides; Quadrimorphina spp.; Quinqueloculina sp.; Ramulina spp.; Reophax spp.; Reussella szajnochae; Rhizammina spp.; Sample code/label; Scheibnerova sp.; Seabrookia cretacea; Siphogenerinoides sp.; Sitella sp.; Sliteria varsoviensis; Spiroplectammina dentata; Spiroplectammina spectabilis; Spiroplectammina spp.; Stensioeina beccariiformis; Stensioeina excolata; Stilostomella spp.; Stilostomella subspinosa; Tappanina selmensis; Tappanina spp.; Uvigerina spp.; Vaginulina trilobata; Valvalabamina lenticula |
| url | https://doi.org/10.1594/PANGAEA.695112 |