Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259
Ocean Drilling Program (ODP) Leg 207, on the Demerara Rise in the western tropical North Atlantic, recovered multiple Cretaceous-Paleogene boundary sections containing an ejecta layer. Sedimentological, geochemical, and paleontological changes across the boundary closely match patterns expected for...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.719608 2023-05-15T17:31:04+02:00 Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 MacLeod, Kenneth G Whitney, Donna L Huber, Brian T Koeberl, Christian LATITUDE: 9.300400 * LONGITUDE: -54.199480 * DATE/TIME START: 2003-02-14T21:35:00 * DATE/TIME END: 2003-02-16T13:15:00 2007-06-16 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.719608 https://doi.org/10.1594/PANGAEA.719608 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.719608 https://doi.org/10.1594/PANGAEA.719608 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: MacLeod, Kenneth G; Whitney, Donna L; Huber, Brian T; Koeberl, Christian (2007): Impact and extinction in remarkably complete Cretaceous-Tertiary boundary sections from Demerara Rise, tropical western North Atlantic. Geological Society of America Bulletin, 119(1-2), 101-115, https://doi.org/10.1130/B25955.1 207-1259 207-1259C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.719608 https://doi.org/10.1130/B25955.1 2023-01-20T07:31:25Z Ocean Drilling Program (ODP) Leg 207, on the Demerara Rise in the western tropical North Atlantic, recovered multiple Cretaceous-Paleogene boundary sections containing an ejecta layer. Sedimentological, geochemical, and paleontological changes across the boundary closely match patterns expected for a mass extinction caused by a single impact. A normally graded, ~2-cm-thick bed of spherules that is interpreted as a primary air-fall deposit of impact ejecta occurs between sediments of the highest Cretaceous Plummerita hantkeninoides foraminiferal zone and the lowest Paleogene P0 foraminiferal zone. There are no other spherule layers in the section. In addition to extinction of Cretaceous taxa, foraminiferal abundance drops from abundant to rare across the boundary. Ir concentrations reach a maximum of ~1.5 ppb at the top of the spherule bed, and the Ir anomaly is associated with enrichment in other siderophile elements. We attribute the unusually well-preserved and relatively simple stratigraphy to the fact that Demerara Rise was close enough (~4500 km) to the Chicxulub impact site to receive ~2 cm of ejecta, yet was far enough away (and perhaps sheltered by the curve of northern South America) to have been relatively unaffected by impact-induced waves. Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-54.199480,-54.199480,9.300400,9.300400) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
207-1259 207-1259C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
207-1259 207-1259C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP MacLeod, Kenneth G Whitney, Donna L Huber, Brian T Koeberl, Christian Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 |
topic_facet |
207-1259 207-1259C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg207 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Ocean Drilling Program (ODP) Leg 207, on the Demerara Rise in the western tropical North Atlantic, recovered multiple Cretaceous-Paleogene boundary sections containing an ejecta layer. Sedimentological, geochemical, and paleontological changes across the boundary closely match patterns expected for a mass extinction caused by a single impact. A normally graded, ~2-cm-thick bed of spherules that is interpreted as a primary air-fall deposit of impact ejecta occurs between sediments of the highest Cretaceous Plummerita hantkeninoides foraminiferal zone and the lowest Paleogene P0 foraminiferal zone. There are no other spherule layers in the section. In addition to extinction of Cretaceous taxa, foraminiferal abundance drops from abundant to rare across the boundary. Ir concentrations reach a maximum of ~1.5 ppb at the top of the spherule bed, and the Ir anomaly is associated with enrichment in other siderophile elements. We attribute the unusually well-preserved and relatively simple stratigraphy to the fact that Demerara Rise was close enough (~4500 km) to the Chicxulub impact site to receive ~2 cm of ejecta, yet was far enough away (and perhaps sheltered by the curve of northern South America) to have been relatively unaffected by impact-induced waves. |
format |
Dataset |
author |
MacLeod, Kenneth G Whitney, Donna L Huber, Brian T Koeberl, Christian |
author_facet |
MacLeod, Kenneth G Whitney, Donna L Huber, Brian T Koeberl, Christian |
author_sort |
MacLeod, Kenneth G |
title |
Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 |
title_short |
Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 |
title_full |
Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 |
title_fullStr |
Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 |
title_full_unstemmed |
Composition of sediments samples spanning the Cretaceous-Tertiary boundary at ODP Site 207-1259 |
title_sort |
composition of sediments samples spanning the cretaceous-tertiary boundary at odp site 207-1259 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.719608 https://doi.org/10.1594/PANGAEA.719608 |
op_coverage |
LATITUDE: 9.300400 * LONGITUDE: -54.199480 * DATE/TIME START: 2003-02-14T21:35:00 * DATE/TIME END: 2003-02-16T13:15:00 |
long_lat |
ENVELOPE(-54.199480,-54.199480,9.300400,9.300400) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: MacLeod, Kenneth G; Whitney, Donna L; Huber, Brian T; Koeberl, Christian (2007): Impact and extinction in remarkably complete Cretaceous-Tertiary boundary sections from Demerara Rise, tropical western North Atlantic. Geological Society of America Bulletin, 119(1-2), 101-115, https://doi.org/10.1130/B25955.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.719608 https://doi.org/10.1594/PANGAEA.719608 |
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.719608 https://doi.org/10.1130/B25955.1 |
_version_ |
1766128387322019840 |