Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites
Cores from Sites 1135, 1136, and 1138 of Ocean Drilling Program Leg 183 to the Kerguelen Plateau (KP) provide the most complete Paleocene and Eocene sections yet recovered from the southern Indian Ocean. These nannofossil-foraminifer oozes and chalks provide an opportunity to study southern high-lat...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.785243 2023-05-15T18:25:57+02:00 Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites Arney, James Wise, Sherwood W MEDIAN LATITUDE: -56.613760 * MEDIAN LONGITUDE: 80.264530 * SOUTH-BOUND LATITUDE: -59.699910 * WEST-BOUND LONGITUDE: 75.974880 * NORTH-BOUND LATITUDE: -53.551750 * EAST-BOUND LONGITUDE: 84.834830 * DATE/TIME START: 1998-12-23T11:45:00 * DATE/TIME END: 1999-01-31T06:15:00 2003-06-28 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.785243 https://doi.org/10.1594/PANGAEA.785243 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.785243 https://doi.org/10.1594/PANGAEA.785243 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Arney, James; Wise, Sherwood W (2003): Paleocene-Eocene nannofossil biostratigraphy of ODP Leg 183, Kerguelen Plateau. In: Frey, FA; Coffin, MF; Wallace, PJ; Quilty, PG (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 183, 1-59, https://doi.org/10.2973/odp.proc.sr.183.014.2003 183-1135A 183-1136A 183-1138A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg183 Ocean Drilling Program ODP Dataset 2003 ftpangaea https://doi.org/10.1594/PANGAEA.785243 https://doi.org/10.2973/odp.proc.sr.183.014.2003 2023-01-20T07:32:35Z Cores from Sites 1135, 1136, and 1138 of Ocean Drilling Program Leg 183 to the Kerguelen Plateau (KP) provide the most complete Paleocene and Eocene sections yet recovered from the southern Indian Ocean. These nannofossil-foraminifer oozes and chalks provide an opportunity to study southern high-latitude biostratigraphic and paleoceanographic events, which is the primary subject of this paper. In addition, a stable isotope profile was established across the Cretaceous/Tertiary (K/T) boundary at Site 1138. An apparently complete K/T boundary was recovered at Site 1138 in terms of assemblage succession, isotopic signature, and reworking of older (Cretaceous) nannofossil taxa. There is a significant color change, a negative carbon isotope shift, and nannofossil turnover. The placement of the boundary based on these criteria, however, is not in agreement with the available shipboard paleomagnetic stratigraphy. We await shore-based paleomagnetic study to confirm or deny those preliminary results. The Paleocene nannofossil assemblage is, in general, characteristic of the high latitudes with abundant Chiasmolithus, Prinsius, and Toweius. Placed in context with other Southern Ocean sites, the biogeography of Hornibrookina indicates the presence of some type of water mass boundary over the KP during the earliest Paleocene. This boundary disappeared by the late Paleocene, however, when there was an influx of warm-water discoasters, sphenoliths, and fasciculiths. This not only indicates that during much of the late Paleocene water temperatures were relatively equable, but preliminary floral and stable isotope analyses also indicate that a relatively complete record of the late Paleocene Thermal Maximum event was recovered at Site 1135. It was only at the beginning of the middle Eocene that water temperatures began to decline and the nannofossil assemblage became dominated by cool-water species while discoaster and sphenolith abundances and diversity were dramatically reduced. One new taxonomic combination is proposed, ... Dataset Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Kerguelen Indian ENVELOPE(75.974880,84.834830,-53.551750,-59.699910) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
183-1135A 183-1136A 183-1138A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg183 Ocean Drilling Program ODP |
spellingShingle |
183-1135A 183-1136A 183-1138A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg183 Ocean Drilling Program ODP Arney, James Wise, Sherwood W Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites |
topic_facet |
183-1135A 183-1136A 183-1138A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg183 Ocean Drilling Program ODP |
description |
Cores from Sites 1135, 1136, and 1138 of Ocean Drilling Program Leg 183 to the Kerguelen Plateau (KP) provide the most complete Paleocene and Eocene sections yet recovered from the southern Indian Ocean. These nannofossil-foraminifer oozes and chalks provide an opportunity to study southern high-latitude biostratigraphic and paleoceanographic events, which is the primary subject of this paper. In addition, a stable isotope profile was established across the Cretaceous/Tertiary (K/T) boundary at Site 1138. An apparently complete K/T boundary was recovered at Site 1138 in terms of assemblage succession, isotopic signature, and reworking of older (Cretaceous) nannofossil taxa. There is a significant color change, a negative carbon isotope shift, and nannofossil turnover. The placement of the boundary based on these criteria, however, is not in agreement with the available shipboard paleomagnetic stratigraphy. We await shore-based paleomagnetic study to confirm or deny those preliminary results. The Paleocene nannofossil assemblage is, in general, characteristic of the high latitudes with abundant Chiasmolithus, Prinsius, and Toweius. Placed in context with other Southern Ocean sites, the biogeography of Hornibrookina indicates the presence of some type of water mass boundary over the KP during the earliest Paleocene. This boundary disappeared by the late Paleocene, however, when there was an influx of warm-water discoasters, sphenoliths, and fasciculiths. This not only indicates that during much of the late Paleocene water temperatures were relatively equable, but preliminary floral and stable isotope analyses also indicate that a relatively complete record of the late Paleocene Thermal Maximum event was recovered at Site 1135. It was only at the beginning of the middle Eocene that water temperatures began to decline and the nannofossil assemblage became dominated by cool-water species while discoaster and sphenolith abundances and diversity were dramatically reduced. One new taxonomic combination is proposed, ... |
format |
Dataset |
author |
Arney, James Wise, Sherwood W |
author_facet |
Arney, James Wise, Sherwood W |
author_sort |
Arney, James |
title |
Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites |
title_short |
Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites |
title_full |
Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites |
title_fullStr |
Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites |
title_full_unstemmed |
Calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of ODP Leg 183 sites |
title_sort |
calcareous nannofossil stratigraphy, nannofossil events and carbon isotopic ratios of odp leg 183 sites |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.785243 https://doi.org/10.1594/PANGAEA.785243 |
op_coverage |
MEDIAN LATITUDE: -56.613760 * MEDIAN LONGITUDE: 80.264530 * SOUTH-BOUND LATITUDE: -59.699910 * WEST-BOUND LONGITUDE: 75.974880 * NORTH-BOUND LATITUDE: -53.551750 * EAST-BOUND LONGITUDE: 84.834830 * DATE/TIME START: 1998-12-23T11:45:00 * DATE/TIME END: 1999-01-31T06:15:00 |
long_lat |
ENVELOPE(75.974880,84.834830,-53.551750,-59.699910) |
geographic |
Southern Ocean Kerguelen Indian |
geographic_facet |
Southern Ocean Kerguelen Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Supplement to: Arney, James; Wise, Sherwood W (2003): Paleocene-Eocene nannofossil biostratigraphy of ODP Leg 183, Kerguelen Plateau. In: Frey, FA; Coffin, MF; Wallace, PJ; Quilty, PG (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 183, 1-59, https://doi.org/10.2973/odp.proc.sr.183.014.2003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.785243 https://doi.org/10.1594/PANGAEA.785243 |
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.785243 https://doi.org/10.2973/odp.proc.sr.183.014.2003 |
_version_ |
1766207692368510976 |