Maastrichtian planktic foraminifera of the South Atlantic Ocean
Stratigraphic, faunal and isotopic analyses of the Maastrichtian at DSDP sites 525A and 21 in the South Atlantic reveal a planktic foraminiferal fauna characterized by two major events, an early late Maastrichtian diversification and end-Maastrichtian mass extinction. Both events are accompanied by...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.681693 2023-05-15T18:21:16+02:00 Maastrichtian planktic foraminifera of the South Atlantic Ocean Li, Liangquan Keller, Gerta MEDIAN LATITUDE: -28.949275 * MEDIAN LONGITUDE: -5.410400 * SOUTH-BOUND LATITUDE: -29.070700 * WEST-BOUND LONGITUDE: -30.597500 * NORTH-BOUND LATITUDE: -28.585000 * EAST-BOUND LONGITUDE: 2.985300 * DATE/TIME START: 1969-01-15T00:00:00 * DATE/TIME END: 1980-06-10T00:00:00 1998-02-08 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.681693 https://doi.org/10.1594/PANGAEA.681693 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.681693 https://doi.org/10.1594/PANGAEA.681693 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Li, Liangquan; Keller, Gerta (1998): Maastrichtian climate, productivity and faunal turnovers in planktic foraminifera in South Atlantic DSDP sites 525A and 21. Marine Micropaleontology, 33(1-2), 55-86, https://doi.org/10.1016/S0377-8398(97)00027-3 3-21 74-525A Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg3 Leg74 South Atlantic/CONT RISE South Atlantic/CREST Dataset 1998 ftpangaea https://doi.org/10.1594/PANGAEA.681693 https://doi.org/10.1016/S0377-8398(97)00027-3 2023-01-20T07:31:07Z Stratigraphic, faunal and isotopic analyses of the Maastrichtian at DSDP sites 525A and 21 in the South Atlantic reveal a planktic foraminiferal fauna characterized by two major events, an early late Maastrichtian diversification and end-Maastrichtian mass extinction. Both events are accompanied by major changes in climate and productivity. The diversification event which occurred in two steps between 70.5 and 69.1 Ma increased species richness by a total of 43% and coincided with the onset of major cooling in surface and bottom waters and increased surface productivity. The onset of the terminal decline in Maastrichtian species richness began at 67.5 Ma and the first significant decline in surface productivity occurred at 66.2 Ma, coincident maximum cooling to 13°C in surface waters and the reduction of the surface-to-deep temperature gradient to less than 5°C. Major climatic and moderate productivity changes mark the mass extinction and the last 500 kyr of the Maastrichtian. Between 200 and 400 kyr before the K-T boundary surface and deep waters warmed rapidly by 3-4°C and cooled again during the last 100 kyr of the Maastrichtian. Surface productivity decreased only moderately across the K-T boundary. Species richness began to decline during the late Maastrichtian cooling and by K-T boundary time, the mass extinction had claimed 66% of the species. Viewed within the context of Maastrichtian climate and productivity changes, the K-T mass extinction could have resulted from extreme environmental stress even without the addition of an extraterrestrial impact. Dataset South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-30.597500,2.985300,-28.585000,-29.070700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
3-21 74-525A Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg3 Leg74 South Atlantic/CONT RISE South Atlantic/CREST |
spellingShingle |
3-21 74-525A Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg3 Leg74 South Atlantic/CONT RISE South Atlantic/CREST Li, Liangquan Keller, Gerta Maastrichtian planktic foraminifera of the South Atlantic Ocean |
topic_facet |
3-21 74-525A Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg3 Leg74 South Atlantic/CONT RISE South Atlantic/CREST |
description |
Stratigraphic, faunal and isotopic analyses of the Maastrichtian at DSDP sites 525A and 21 in the South Atlantic reveal a planktic foraminiferal fauna characterized by two major events, an early late Maastrichtian diversification and end-Maastrichtian mass extinction. Both events are accompanied by major changes in climate and productivity. The diversification event which occurred in two steps between 70.5 and 69.1 Ma increased species richness by a total of 43% and coincided with the onset of major cooling in surface and bottom waters and increased surface productivity. The onset of the terminal decline in Maastrichtian species richness began at 67.5 Ma and the first significant decline in surface productivity occurred at 66.2 Ma, coincident maximum cooling to 13°C in surface waters and the reduction of the surface-to-deep temperature gradient to less than 5°C. Major climatic and moderate productivity changes mark the mass extinction and the last 500 kyr of the Maastrichtian. Between 200 and 400 kyr before the K-T boundary surface and deep waters warmed rapidly by 3-4°C and cooled again during the last 100 kyr of the Maastrichtian. Surface productivity decreased only moderately across the K-T boundary. Species richness began to decline during the late Maastrichtian cooling and by K-T boundary time, the mass extinction had claimed 66% of the species. Viewed within the context of Maastrichtian climate and productivity changes, the K-T mass extinction could have resulted from extreme environmental stress even without the addition of an extraterrestrial impact. |
format |
Dataset |
author |
Li, Liangquan Keller, Gerta |
author_facet |
Li, Liangquan Keller, Gerta |
author_sort |
Li, Liangquan |
title |
Maastrichtian planktic foraminifera of the South Atlantic Ocean |
title_short |
Maastrichtian planktic foraminifera of the South Atlantic Ocean |
title_full |
Maastrichtian planktic foraminifera of the South Atlantic Ocean |
title_fullStr |
Maastrichtian planktic foraminifera of the South Atlantic Ocean |
title_full_unstemmed |
Maastrichtian planktic foraminifera of the South Atlantic Ocean |
title_sort |
maastrichtian planktic foraminifera of the south atlantic ocean |
publisher |
PANGAEA |
publishDate |
1998 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.681693 https://doi.org/10.1594/PANGAEA.681693 |
op_coverage |
MEDIAN LATITUDE: -28.949275 * MEDIAN LONGITUDE: -5.410400 * SOUTH-BOUND LATITUDE: -29.070700 * WEST-BOUND LONGITUDE: -30.597500 * NORTH-BOUND LATITUDE: -28.585000 * EAST-BOUND LONGITUDE: 2.985300 * DATE/TIME START: 1969-01-15T00:00:00 * DATE/TIME END: 1980-06-10T00:00:00 |
long_lat |
ENVELOPE(-30.597500,2.985300,-28.585000,-29.070700) |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Supplement to: Li, Liangquan; Keller, Gerta (1998): Maastrichtian climate, productivity and faunal turnovers in planktic foraminifera in South Atlantic DSDP sites 525A and 21. Marine Micropaleontology, 33(1-2), 55-86, https://doi.org/10.1016/S0377-8398(97)00027-3 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.681693 https://doi.org/10.1594/PANGAEA.681693 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.681693 https://doi.org/10.1016/S0377-8398(97)00027-3 |
_version_ |
1766200440111759360 |