Age estimates of Discoaster datums and corresponding isotope stages (Table 2)
High-resolution records (2 7 kyr) of Upper Pliocene Discoaster abundances obtained from six ODP/DSDP sites are assessed independently using oxygen isotope stratigraphy. Four Atlantic Ocean sites (DSDP Sites 552 and 607, and ODP Sites 659 and 662) comprise a transect from 56°N to 1°S and provide a re...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.705530 2023-05-15T17:31:43+02:00 Age estimates of Discoaster datums and corresponding isotope stages (Table 2) Chapman, Mark R Chepstow-Lusty, Alex J MEDIAN LATITUDE: 19.064183 * MEDIAN LONGITUDE: -8.385600 * SOUTH-BOUND LATITUDE: -3.915000 * WEST-BOUND LONGITUDE: -32.957300 * NORTH-BOUND LATITUDE: 56.042700 * EAST-BOUND LONGITUDE: 60.551700 * DATE/TIME START: 1981-07-31T00:00:00 * DATE/TIME END: 1987-06-08T00:00:00 * MINIMUM ELEVATION: -3824.0 m * MAXIMUM ELEVATION: -2301.0 m 1997-10-14 text/tab-separated-values, 30 data points https://doi.pangaea.de/10.1594/PANGAEA.705530 https://doi.org/10.1594/PANGAEA.705530 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.705530 https://doi.org/10.1594/PANGAEA.705530 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Chapman, Mark R; Chepstow-Lusty, Alex J (1997): Late Pliocene climatic change and the global extinction of the discoasters: an independent assessment using oxygen isotope records. Palaeogeography, Palaeoclimatology, Palaeoecology, 134(1-4), 109-125, https://doi.org/10.1016/S0031-0182(97)00035-7 108-659 108-662 108-667 115-709 81-552_Site 94-607_Site AGE Ageprofile Datum Description COMPCORE Composite Core Deep Sea Drilling Project DSDP Elevation of event Event label Glomar Challenger Joides Resolution Latitude of event Leg108 Leg115 Leg81 Leg94 Longitude of event Marine isotopic stage North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean Dataset 1997 ftpangaea https://doi.org/10.1594/PANGAEA.705530 https://doi.org/10.1016/S0031-0182(97)00035-7 2023-01-20T08:46:47Z High-resolution records (2 7 kyr) of Upper Pliocene Discoaster abundances obtained from six ODP/DSDP sites are assessed independently using oxygen isotope stratigraphy. Four Atlantic Ocean sites (DSDP Sites 552 and 607, and ODP Sites 659 and 662) comprise a transect from 56°N to 1°S and provide a record of latitudinal variations in Diseoaster biogeography. Low-latitude sites in the Atlantic (ODP Site 662), Pacific (ODP Site 677), and Indian (ODP Site 709) oceans provide additional information about variability in Discoaster abundance patterns within the equatorial region. A common chronology, based on the astronomical time scale developed for ODP Site 677, has been established for all the sites. By integrating oxygen isotope data and Discoaster abundance records at each site we are able to independently evaluate the temporal and spatial distribution of D. brouweri and D. triradiatus in the 500 kyr prior to the extinction of the discoasters near the base of the Olduvai subchron. Major decreases in abundance are evident during some of the more intense late Pliocene glacial events. In particular, glacial isotope stages 82, 96, 98 and 100 are associated with distinct abundance minima. At these times, large-scale changes in surface hydrographic conditions appear to have suppressed Discoaster numbers on a global scale. The increase in abundance of D. triradiatus, which precedes the extinction of the discoasters by around 200 kyr, may also be related to the intensification of environmental pressures that accompanied the build-up of Northern Hemisphere ice sheets during the late Pliocene. In spite of contrasting geographic and oceanographic settings, the various D. brouweri and D. triradiatus records are remarkably similar. This demonstrates that the acme and extinction events are excellent biostratigraphic datums. The simultaneous extinction of D. brouweri and D. triradiatus at 1.95 Ma were synchronous events at both a regional scale within the Atlantic, and on a global scale between the three major oceans. However, ... Dataset North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science Indian Pacific ENVELOPE(-32.957300,60.551700,56.042700,-3.915000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
108-659 108-662 108-667 115-709 81-552_Site 94-607_Site AGE Ageprofile Datum Description COMPCORE Composite Core Deep Sea Drilling Project DSDP Elevation of event Event label Glomar Challenger Joides Resolution Latitude of event Leg108 Leg115 Leg81 Leg94 Longitude of event Marine isotopic stage North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean |
spellingShingle |
108-659 108-662 108-667 115-709 81-552_Site 94-607_Site AGE Ageprofile Datum Description COMPCORE Composite Core Deep Sea Drilling Project DSDP Elevation of event Event label Glomar Challenger Joides Resolution Latitude of event Leg108 Leg115 Leg81 Leg94 Longitude of event Marine isotopic stage North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean Chapman, Mark R Chepstow-Lusty, Alex J Age estimates of Discoaster datums and corresponding isotope stages (Table 2) |
topic_facet |
108-659 108-662 108-667 115-709 81-552_Site 94-607_Site AGE Ageprofile Datum Description COMPCORE Composite Core Deep Sea Drilling Project DSDP Elevation of event Event label Glomar Challenger Joides Resolution Latitude of event Leg108 Leg115 Leg81 Leg94 Longitude of event Marine isotopic stage North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean South Indian Ridge South Indian Ocean |
description |
High-resolution records (2 7 kyr) of Upper Pliocene Discoaster abundances obtained from six ODP/DSDP sites are assessed independently using oxygen isotope stratigraphy. Four Atlantic Ocean sites (DSDP Sites 552 and 607, and ODP Sites 659 and 662) comprise a transect from 56°N to 1°S and provide a record of latitudinal variations in Diseoaster biogeography. Low-latitude sites in the Atlantic (ODP Site 662), Pacific (ODP Site 677), and Indian (ODP Site 709) oceans provide additional information about variability in Discoaster abundance patterns within the equatorial region. A common chronology, based on the astronomical time scale developed for ODP Site 677, has been established for all the sites. By integrating oxygen isotope data and Discoaster abundance records at each site we are able to independently evaluate the temporal and spatial distribution of D. brouweri and D. triradiatus in the 500 kyr prior to the extinction of the discoasters near the base of the Olduvai subchron. Major decreases in abundance are evident during some of the more intense late Pliocene glacial events. In particular, glacial isotope stages 82, 96, 98 and 100 are associated with distinct abundance minima. At these times, large-scale changes in surface hydrographic conditions appear to have suppressed Discoaster numbers on a global scale. The increase in abundance of D. triradiatus, which precedes the extinction of the discoasters by around 200 kyr, may also be related to the intensification of environmental pressures that accompanied the build-up of Northern Hemisphere ice sheets during the late Pliocene. In spite of contrasting geographic and oceanographic settings, the various D. brouweri and D. triradiatus records are remarkably similar. This demonstrates that the acme and extinction events are excellent biostratigraphic datums. The simultaneous extinction of D. brouweri and D. triradiatus at 1.95 Ma were synchronous events at both a regional scale within the Atlantic, and on a global scale between the three major oceans. However, ... |
format |
Dataset |
author |
Chapman, Mark R Chepstow-Lusty, Alex J |
author_facet |
Chapman, Mark R Chepstow-Lusty, Alex J |
author_sort |
Chapman, Mark R |
title |
Age estimates of Discoaster datums and corresponding isotope stages (Table 2) |
title_short |
Age estimates of Discoaster datums and corresponding isotope stages (Table 2) |
title_full |
Age estimates of Discoaster datums and corresponding isotope stages (Table 2) |
title_fullStr |
Age estimates of Discoaster datums and corresponding isotope stages (Table 2) |
title_full_unstemmed |
Age estimates of Discoaster datums and corresponding isotope stages (Table 2) |
title_sort |
age estimates of discoaster datums and corresponding isotope stages (table 2) |
publisher |
PANGAEA |
publishDate |
1997 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.705530 https://doi.org/10.1594/PANGAEA.705530 |
op_coverage |
MEDIAN LATITUDE: 19.064183 * MEDIAN LONGITUDE: -8.385600 * SOUTH-BOUND LATITUDE: -3.915000 * WEST-BOUND LONGITUDE: -32.957300 * NORTH-BOUND LATITUDE: 56.042700 * EAST-BOUND LONGITUDE: 60.551700 * DATE/TIME START: 1981-07-31T00:00:00 * DATE/TIME END: 1987-06-08T00:00:00 * MINIMUM ELEVATION: -3824.0 m * MAXIMUM ELEVATION: -2301.0 m |
long_lat |
ENVELOPE(-32.957300,60.551700,56.042700,-3.915000) |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Supplement to: Chapman, Mark R; Chepstow-Lusty, Alex J (1997): Late Pliocene climatic change and the global extinction of the discoasters: an independent assessment using oxygen isotope records. Palaeogeography, Palaeoclimatology, Palaeoecology, 134(1-4), 109-125, https://doi.org/10.1016/S0031-0182(97)00035-7 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.705530 https://doi.org/10.1594/PANGAEA.705530 |
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.705530 https://doi.org/10.1016/S0031-0182(97)00035-7 |
_version_ |
1766129420509118464 |