Relative abundances of benthic foraminifera at the Cretaceous/Paleogene boundary in DSDP Hole 62-465A, Southern Hess Rise in the central North Pacific (Appendix A)
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| Format: | Dataset Open Access |
| Language: | en |
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2005
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| _version_ | 1867172310443622400 |
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| author | Alegret, Laia Thomas, Ellen |
| author_facet | Alegret, Laia Thomas, Ellen |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Uppermost Maastrichtian benthic foraminiferal assemblages (>63 µm) are diverse, indicating mesotrophic conditions in lower bathyal DSDP Hole 465A (Hess Rise, central North Pacific), in 4 lower bathyal land sections in central-East and Northeastern Mexico, and in the upper to middle bathyal Agost section (Tethys area, Southeastern Spain). They indicate more eutrophic conditions in lower bathyal ODP Hole 1049C (Blake Nose, Northwestern Atlantic). Benthic foraminifers did not suffer significant extinction at the K/Pg boundary, but diversity and heterogeneity of the assemblages and the percentage of infaunal morphogroups decreased drastically in all sections, with the exception of DSDP Hole 465A where the percentage of infaunal taxa increased. These faunal changes probably reflect the effect on the benthic faunas of a widespread decrease in the food supply to the sea floor, as a result of the collapse of primary productivity at the K/Pg boundary. The decrease in food supply apparently affected the benthic faunas least at more eutrophic NW Atlantic ODP Site 1049 and at Pacific DSDP Site 465, which is distal from the impact site of the K/Pg bolide on the Yucatan Peninsula. At these sites the faunas recovered within the Parvulorugoglobigerina eugubina Biozone (~100 ky), although diversity and heterogeneity remained low through the early Danian, possibly indicating environmental stress. This stress might be related to a high or fluctuating food supply by primary producers that could not easily be used by the benthos, such as various bloom species of dinoflagellates. Benthic assemblages recovered more slowly (~300 ky) in the Mexican and Spanish sections. Low oxygen conditions after the K/Pg boundary could be inferred from the benthic assemblages at Agost (Southeastern Spain) only. A short episode of hypoxia, however, may be obscured at Pacific DSDP Hole 465A by drilling disturbance, and in the Mexican sections and Hole 1049C by incomplete sections due to downslope transport. Benthic foraminiferal assemblages thus appear to have been affected by the collapse of primary productivity at the K/Pg boundary to a different extent in different regions, and took different lengths of time for their recovery after the boundary. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_694032 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Relative abundances of benthic foraminifera at the Cretaceous/Paleogene boundary in DSDP Hole 62-465A, Southern Hess Rise in the central North Pacific (Appendix A) Alegret, Laia Thomas, Ellen 62-465A; Alabamina wilcoxensis; Anomalinoides acuta; Anomalinoides affinis; Anomalinoides ammonoides; Anomalinoides spp.; Aragonia sp.; Aragonia velascoensis; Bolivinoides decoratus; Bolivinoides delicatulus; Bulimina midwayensis; Bulimina ovula; Bulimina spp.; Bulimina trinitatensis; Bulimina velascoensis; Buliminella beaumonti; Buliminella spp.; Cibicidoides howelli; Cibicidoides hyphalus; Cibicidoides spp.; Cibicidoides velascoensis; Clavulinoides amorpha; Clavulinoides spp.; Clavulinoides trilatera; Coryphostoma sp.; Counting >63 µm fraction; Deep Sea Drilling Project; DEPTH, sediment/rock; Dorothia pupa; Dorothia spp.; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Ellipsodimorphina spp.; Eouvigerina spp.; Eouvigerina subsculptura; Euuvigerina elongata; Fissurina spp.; Frondicularia sp.; Fursenkoina tegulata; Gaudryina pyramidata; Gaudryina spp.; Glandulina spp.; Globorotalites sp.; Globulina prisca; Globulina spp.; Glomar Challenger; Guttulina sp.; Gyroidinoides beisseli; Gyroidinoides depressus; Gyroidinoides globosus; Gyroidinoides gyrardanus; Gyroidinoides spp.; Heronallenia lingulata; Laevidentalinidae; Lagena spp.; Leg62; Lenticulina spp.; Marginulina sp.; Marssonella oxycona; Marssonella spp.; Neoflabellina sp.; North Pacific/CONT RISE; Nuttallides spp.; Nuttallides truempyi; Nuttallinella florealis; Nuttallinella spp.; Oridorsalis plummerae; Oridorsalis spp.; Oridorsalis umbonatus; Osangularia cordieriana; Osangularia spp.; Osangularia velascoensis; Paliolatella sp.; Paralabamina hillebrandti; Paralabamina lunata; Paralabamina sp.; Pleurostomella spp.; Praebulimina reussi; Praebulimina spp.; Pseudopolimorphina cuyleri; Pseudopolimorphina sp.; Pullenia jarvisi; Pyramidina rudita; Pyramidina sp.; Pyrulinoides sp.; Quadratobuliminella pyramidalis; Quadrimorphina allomorphinoides; Quadrimorphina sp.; Quinqueloculina sp.; Reussella szajnochae; Sample code/label; Scheibnerova sp.; Spiroplectammina excolata; Spiroplectammina spectabilis; Spiroplectammina spp.; Stensioeina beccariiformis; Stilostomella subspinosa; Valvalabamina lenticula; Vulvulina sp. Uppermost Maastrichtian benthic foraminiferal assemblages (>63 µm) are diverse, indicating mesotrophic conditions in lower bathyal DSDP Hole 465A (Hess Rise, central North Pacific), in 4 lower bathyal land sections in central-East and Northeastern Mexico, and in the upper to middle bathyal Agost section (Tethys area, Southeastern Spain). They indicate more eutrophic conditions in lower bathyal ODP Hole 1049C (Blake Nose, Northwestern Atlantic). Benthic foraminifers did not suffer significant extinction at the K/Pg boundary, but diversity and heterogeneity of the assemblages and the percentage of infaunal morphogroups decreased drastically in all sections, with the exception of DSDP Hole 465A where the percentage of infaunal taxa increased. These faunal changes probably reflect the effect on the benthic faunas of a widespread decrease in the food supply to the sea floor, as a result of the collapse of primary productivity at the K/Pg boundary. The decrease in food supply apparently affected the benthic faunas least at more eutrophic NW Atlantic ODP Site 1049 and at Pacific DSDP Site 465, which is distal from the impact site of the K/Pg bolide on the Yucatan Peninsula. At these sites the faunas recovered within the Parvulorugoglobigerina eugubina Biozone (~100 ky), although diversity and heterogeneity remained low through the early Danian, possibly indicating environmental stress. This stress might be related to a high or fluctuating food supply by primary producers that could not easily be used by the benthos, such as various bloom species of dinoflagellates. Benthic assemblages recovered more slowly (~300 ky) in the Mexican and Spanish sections. Low oxygen conditions after the K/Pg boundary could be inferred from the benthic assemblages at Agost (Southeastern Spain) only. A short episode of hypoxia, however, may be obscured at Pacific DSDP Hole 465A by drilling disturbance, and in the Mexican sections and Hole 1049C by incomplete sections due to downslope transport. Benthic foraminiferal assemblages thus appear to have been affected by the collapse of primary productivity at the K/Pg boundary to a different extent in different regions, and took different lengths of time for their recovery after the boundary. |
| title | Relative abundances of benthic foraminifera at the Cretaceous/Paleogene boundary in DSDP Hole 62-465A, Southern Hess Rise in the central North Pacific (Appendix A) |
| topic | 62-465A; Alabamina wilcoxensis; Anomalinoides acuta; Anomalinoides affinis; Anomalinoides ammonoides; Anomalinoides spp.; Aragonia sp.; Aragonia velascoensis; Bolivinoides decoratus; Bolivinoides delicatulus; Bulimina midwayensis; Bulimina ovula; Bulimina spp.; Bulimina trinitatensis; Bulimina velascoensis; Buliminella beaumonti; Buliminella spp.; Cibicidoides howelli; Cibicidoides hyphalus; Cibicidoides spp.; Cibicidoides velascoensis; Clavulinoides amorpha; Clavulinoides spp.; Clavulinoides trilatera; Coryphostoma sp.; Counting >63 µm fraction; Deep Sea Drilling Project; DEPTH, sediment/rock; Dorothia pupa; Dorothia spp.; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Ellipsodimorphina spp.; Eouvigerina spp.; Eouvigerina subsculptura; Euuvigerina elongata; Fissurina spp.; Frondicularia sp.; Fursenkoina tegulata; Gaudryina pyramidata; Gaudryina spp.; Glandulina spp.; Globorotalites sp.; Globulina prisca; Globulina spp.; Glomar Challenger; Guttulina sp.; Gyroidinoides beisseli; Gyroidinoides depressus; Gyroidinoides globosus; Gyroidinoides gyrardanus; Gyroidinoides spp.; Heronallenia lingulata; Laevidentalinidae; Lagena spp.; Leg62; Lenticulina spp.; Marginulina sp.; Marssonella oxycona; Marssonella spp.; Neoflabellina sp.; North Pacific/CONT RISE; Nuttallides spp.; Nuttallides truempyi; Nuttallinella florealis; Nuttallinella spp.; Oridorsalis plummerae; Oridorsalis spp.; Oridorsalis umbonatus; Osangularia cordieriana; Osangularia spp.; Osangularia velascoensis; Paliolatella sp.; Paralabamina hillebrandti; Paralabamina lunata; Paralabamina sp.; Pleurostomella spp.; Praebulimina reussi; Praebulimina spp.; Pseudopolimorphina cuyleri; Pseudopolimorphina sp.; Pullenia jarvisi; Pyramidina rudita; Pyramidina sp.; Pyrulinoides sp.; Quadratobuliminella pyramidalis; Quadrimorphina allomorphinoides; Quadrimorphina sp.; Quinqueloculina sp.; Reussella szajnochae; Sample code/label; Scheibnerova sp.; Spiroplectammina excolata; Spiroplectammina spectabilis; Spiroplectammina spp.; Stensioeina beccariiformis; Stilostomella subspinosa; Valvalabamina lenticula; Vulvulina sp. |
| url | https://doi.org/10.1594/PANGAEA.694032 |