Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean
Quantitative analyses of selected calcareous nannofossils in deep-sea sections recovered from the paleo-equatorial Pacific (ODP Leg 199) provide new information about biostratigraphy, biochronology and the evolutionary history of calcareous nannofossils across the Paleocene/Eocene transition interva...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.694021 2024-09-15T18:23:14+00:00 Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean Raffi, Isabella Backman, Jan Pälike, Heiko MEDIAN LATITUDE: 24.977533 * MEDIAN LONGITUDE: -127.374969 * SOUTH-BOUND LATITUDE: 10.176660 * WEST-BOUND LONGITUDE: -147.933180 * NORTH-BOUND LATITUDE: 48.515200 * EAST-BOUND LONGITUDE: -13.439500 * DATE/TIME START: 1981-06-30T00:00:00 * DATE/TIME END: 2001-12-05T00:00:00 2005 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.694021 https://doi.org/10.1594/PANGAEA.694021 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.694021 https://doi.org/10.1594/PANGAEA.694021 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Raffi, Isabella; Backman, Jan; Pälike, Heiko (2005): Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 226(1-2), 93-126, https://doi.org/10.1016/j.palaeo.2005.05.006 199-1215 199-1215B 199-1220B 199-1221C 80-550 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg199 Leg80 North Atlantic/PLAIN North Pacific Ocean Ocean Drilling Program ODP dataset publication series 2005 ftpangaea https://doi.org/10.1594/PANGAEA.69402110.1016/j.palaeo.2005.05.006 2024-07-24T02:31:42Z Quantitative analyses of selected calcareous nannofossils in deep-sea sections recovered from the paleo-equatorial Pacific (ODP Leg 199) provide new information about biostratigraphy, biochronology and the evolutionary history of calcareous nannofossils across the Paleocene/Eocene transition interval. The sediment cores from ODP Leg 199 represent the first continuous Paleocene/Eocene boundary sections ever to be sampled in the central equatorial Pacific Ocean. Calcareous nannofossil assemblages are studied to document the distribution of biostratigraphically useful taxa such as Ericsonia, Discoaster, Fasciculithus, Rhomboaster and Tribrachiatus. Focus is given to the evolution of the Rhomboaster-Tribrachiatus lineage in the lower Eocene interval at Site 1215, and on the stratigraphic relationship of these taxa relative to species in the genus Fasciculithus. Critical intervals of North Atlantic DSDP Site 550 have also been re-examined. The Tribrachiatus digitalis morphotype was described at Site 550 from an interval affected by down-hole contamination, partly originating from within the Tribrachiatus orthostylus range. The T. digitalis morphotype represents an evolutionary transitional form between T. contortus and T. orthostylus, entering the stratigraphic record within the range of the former species and disappearing within the lower part of the range of the latter species. The subzonal subdivision of Zone NP10 hence collapses. Lithological and colour variability reflecting orbital cyclicity occur in the lower Eocene of Site 1215, permitting a relative astronomical age calibration of the Tribrachiatus taxa. The distinct Rhomboaster spp.-Discoaster araneus association also occurs in the paleo-equatorial Pacific Ocean, together with a marked decrease in diversity of Fasciculithus spp. Site 1220 reveals a short peak abundance of Thoracosphaera spp. just above the P/E boundary interval, which probably reflects a stressed surface water environment. Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-147.933180,-13.439500,48.515200,10.176660) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
199-1215 199-1215B 199-1220B 199-1221C 80-550 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg199 Leg80 North Atlantic/PLAIN North Pacific Ocean Ocean Drilling Program ODP |
spellingShingle |
199-1215 199-1215B 199-1220B 199-1221C 80-550 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg199 Leg80 North Atlantic/PLAIN North Pacific Ocean Ocean Drilling Program ODP Raffi, Isabella Backman, Jan Pälike, Heiko Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean |
topic_facet |
199-1215 199-1215B 199-1220B 199-1221C 80-550 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg199 Leg80 North Atlantic/PLAIN North Pacific Ocean Ocean Drilling Program ODP |
description |
Quantitative analyses of selected calcareous nannofossils in deep-sea sections recovered from the paleo-equatorial Pacific (ODP Leg 199) provide new information about biostratigraphy, biochronology and the evolutionary history of calcareous nannofossils across the Paleocene/Eocene transition interval. The sediment cores from ODP Leg 199 represent the first continuous Paleocene/Eocene boundary sections ever to be sampled in the central equatorial Pacific Ocean. Calcareous nannofossil assemblages are studied to document the distribution of biostratigraphically useful taxa such as Ericsonia, Discoaster, Fasciculithus, Rhomboaster and Tribrachiatus. Focus is given to the evolution of the Rhomboaster-Tribrachiatus lineage in the lower Eocene interval at Site 1215, and on the stratigraphic relationship of these taxa relative to species in the genus Fasciculithus. Critical intervals of North Atlantic DSDP Site 550 have also been re-examined. The Tribrachiatus digitalis morphotype was described at Site 550 from an interval affected by down-hole contamination, partly originating from within the Tribrachiatus orthostylus range. The T. digitalis morphotype represents an evolutionary transitional form between T. contortus and T. orthostylus, entering the stratigraphic record within the range of the former species and disappearing within the lower part of the range of the latter species. The subzonal subdivision of Zone NP10 hence collapses. Lithological and colour variability reflecting orbital cyclicity occur in the lower Eocene of Site 1215, permitting a relative astronomical age calibration of the Tribrachiatus taxa. The distinct Rhomboaster spp.-Discoaster araneus association also occurs in the paleo-equatorial Pacific Ocean, together with a marked decrease in diversity of Fasciculithus spp. Site 1220 reveals a short peak abundance of Thoracosphaera spp. just above the P/E boundary interval, which probably reflects a stressed surface water environment. |
format |
Other/Unknown Material |
author |
Raffi, Isabella Backman, Jan Pälike, Heiko |
author_facet |
Raffi, Isabella Backman, Jan Pälike, Heiko |
author_sort |
Raffi, Isabella |
title |
Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean |
title_short |
Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean |
title_full |
Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean |
title_fullStr |
Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean |
title_full_unstemmed |
Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean |
title_sort |
changes in calcareous nannofossil assemblages across the paleocene/eocene transition from the paleo-equatorial pacific ocean |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.694021 https://doi.org/10.1594/PANGAEA.694021 |
op_coverage |
MEDIAN LATITUDE: 24.977533 * MEDIAN LONGITUDE: -127.374969 * SOUTH-BOUND LATITUDE: 10.176660 * WEST-BOUND LONGITUDE: -147.933180 * NORTH-BOUND LATITUDE: 48.515200 * EAST-BOUND LONGITUDE: -13.439500 * DATE/TIME START: 1981-06-30T00:00:00 * DATE/TIME END: 2001-12-05T00:00:00 |
long_lat |
ENVELOPE(-147.933180,-13.439500,48.515200,10.176660) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Raffi, Isabella; Backman, Jan; Pälike, Heiko (2005): Changes in calcareous nannofossil assemblages across the Paleocene/Eocene transition from the paleo-equatorial Pacific Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology, 226(1-2), 93-126, https://doi.org/10.1016/j.palaeo.2005.05.006 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.694021 https://doi.org/10.1594/PANGAEA.694021 |
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.69402110.1016/j.palaeo.2005.05.006 |
_version_ |
1810463412206960640 |