(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B
Foraminifer count and multispecies isotopic data from Ocean Drilling Program (ODP) Sites 806 (0°N, 165°E) and 847 (0°N, 95°W) are presented for the last 6.4 m.y. Faunal evidence shows a decline of taxa of Miocene origin between 4.5 and 4.0 Ma at both sites. Prior to this decline, Globoturborotalita...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2000
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.848108 https://doi.org/10.1594/PANGAEA.848108 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.848108 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.848108 2023-05-15T18:01:12+02:00 (Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B Chaisson, William P Ravelo, Ana Christina MEDIAN LATITUDE: 0.255855 * MEDIAN LONGITUDE: -147.979725 * SOUTH-BOUND LATITUDE: 0.193210 * WEST-BOUND LONGITUDE: 159.361000 * NORTH-BOUND LATITUDE: 0.318500 * EAST-BOUND LONGITUDE: -95.320450 * DATE/TIME START: 1990-02-18T21:00:00 * DATE/TIME END: 1991-05-29T18:40:00 * MINIMUM DEPTH, sediment/rock: 5.25 m * MAXIMUM DEPTH, sediment/rock: 217.46 m 2000-07-14 text/tab-separated-values, 166 data points https://doi.pangaea.de/10.1594/PANGAEA.848108 https://doi.org/10.1594/PANGAEA.848108 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.848108 https://doi.org/10.1594/PANGAEA.848108 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Chaisson, William P; Ravelo, Ana Christina (2000): Pliocene development of the east-west hydrographic gradient in the equatorial Pacific. Paleoceanography, 15(5), 497-505, https://doi.org/10.1029/1999PA000442 130-806B 138-847B AGE DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Globigerinoides sacculifer sac δ18O Globorotalia tumida Joides Resolution Leg130 Leg138 Mass spectrometer VG Optima Neogloboquadrina dutertrei North Pacific Ocean Ocean Drilling Program ODP Sample code/label Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.848108 https://doi.org/10.1029/1999PA000442 2023-01-20T09:06:10Z Foraminifer count and multispecies isotopic data from Ocean Drilling Program (ODP) Sites 806 (0°N, 165°E) and 847 (0°N, 95°W) are presented for the last 6.4 m.y. Faunal evidence shows a decline of taxa of Miocene origin between 4.5 and 4.0 Ma at both sites. Prior to this decline, Globoturborotalita species and Neogloboquadrina acostaensis dominated Sites 806 and 847 assemblages, respectively. Globoturborotalitids were not replaced by other thermocline dwellers after 4.2 Ma, which suggests a deepening of the thermocline and thickening of the warm pool at Site 806. At Site 847 in the eastern “cold tongue”, N. acostaensis was gradually replaced by N. dutertrei. After 4.2 Ma, there was also a large increase (from 0.7 to 1.3 per mil) in the difference between the d18O values of Globigerinoides sacculifer, a surface dweller, and Neogloboquadrina dutertrei, a seasonal thermocline dweller at Site 847; these data, in conjunction with faunal evidence, suggest that the temperature gradient in the upper photic zone increased significantly, largely because of subsurface cooling. The events in planktonic foraminifer evolution and ecology suggest that between 4.5 and 4.0 Ma a significant step was made toward development of the modern east-west gradient in surface hydrography. The timing of these events suggests that they were related to the closing of the Central American Seaway and subsequent changes in meridional temperature gradients and/or changes in air-sea interactions that modified tropical winds. Dataset Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(159.361000,-95.320450,0.318500,0.193210) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
130-806B 138-847B AGE DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Globigerinoides sacculifer sac δ18O Globorotalia tumida Joides Resolution Leg130 Leg138 Mass spectrometer VG Optima Neogloboquadrina dutertrei North Pacific Ocean Ocean Drilling Program ODP Sample code/label |
spellingShingle |
130-806B 138-847B AGE DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Globigerinoides sacculifer sac δ18O Globorotalia tumida Joides Resolution Leg130 Leg138 Mass spectrometer VG Optima Neogloboquadrina dutertrei North Pacific Ocean Ocean Drilling Program ODP Sample code/label Chaisson, William P Ravelo, Ana Christina (Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B |
topic_facet |
130-806B 138-847B AGE DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Globigerinoides sacculifer sac δ18O Globorotalia tumida Joides Resolution Leg130 Leg138 Mass spectrometer VG Optima Neogloboquadrina dutertrei North Pacific Ocean Ocean Drilling Program ODP Sample code/label |
description |
Foraminifer count and multispecies isotopic data from Ocean Drilling Program (ODP) Sites 806 (0°N, 165°E) and 847 (0°N, 95°W) are presented for the last 6.4 m.y. Faunal evidence shows a decline of taxa of Miocene origin between 4.5 and 4.0 Ma at both sites. Prior to this decline, Globoturborotalita species and Neogloboquadrina acostaensis dominated Sites 806 and 847 assemblages, respectively. Globoturborotalitids were not replaced by other thermocline dwellers after 4.2 Ma, which suggests a deepening of the thermocline and thickening of the warm pool at Site 806. At Site 847 in the eastern “cold tongue”, N. acostaensis was gradually replaced by N. dutertrei. After 4.2 Ma, there was also a large increase (from 0.7 to 1.3 per mil) in the difference between the d18O values of Globigerinoides sacculifer, a surface dweller, and Neogloboquadrina dutertrei, a seasonal thermocline dweller at Site 847; these data, in conjunction with faunal evidence, suggest that the temperature gradient in the upper photic zone increased significantly, largely because of subsurface cooling. The events in planktonic foraminifer evolution and ecology suggest that between 4.5 and 4.0 Ma a significant step was made toward development of the modern east-west gradient in surface hydrography. The timing of these events suggests that they were related to the closing of the Central American Seaway and subsequent changes in meridional temperature gradients and/or changes in air-sea interactions that modified tropical winds. |
format |
Dataset |
author |
Chaisson, William P Ravelo, Ana Christina |
author_facet |
Chaisson, William P Ravelo, Ana Christina |
author_sort |
Chaisson, William P |
title |
(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B |
title_short |
(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B |
title_full |
(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B |
title_fullStr |
(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B |
title_full_unstemmed |
(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B |
title_sort |
(table 1) oxygen isotopic composition of planktonic foraminifera of odp holes 130-806b and 138-847b |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.848108 https://doi.org/10.1594/PANGAEA.848108 |
op_coverage |
MEDIAN LATITUDE: 0.255855 * MEDIAN LONGITUDE: -147.979725 * SOUTH-BOUND LATITUDE: 0.193210 * WEST-BOUND LONGITUDE: 159.361000 * NORTH-BOUND LATITUDE: 0.318500 * EAST-BOUND LONGITUDE: -95.320450 * DATE/TIME START: 1990-02-18T21:00:00 * DATE/TIME END: 1991-05-29T18:40:00 * MINIMUM DEPTH, sediment/rock: 5.25 m * MAXIMUM DEPTH, sediment/rock: 217.46 m |
long_lat |
ENVELOPE(159.361000,-95.320450,0.318500,0.193210) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Chaisson, William P; Ravelo, Ana Christina (2000): Pliocene development of the east-west hydrographic gradient in the equatorial Pacific. Paleoceanography, 15(5), 497-505, https://doi.org/10.1029/1999PA000442 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.848108 https://doi.org/10.1594/PANGAEA.848108 |
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.848108 https://doi.org/10.1029/1999PA000442 |
_version_ |
1766170575907061760 |