Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517
Stable isotopic analyses (18O/16O, 13C/12C) of both benthic and planktonic foraminifers from DSDP Holes 516A and 517 appear to reflect changing paleoclimatic and paleoceanographic conditions in the South Atlantic Ocean during the Pliocene. The d18O records of Cibicides wuellerstorfi and Globigerinoi...
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1983
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.812149 2023-05-15T18:21:19+02:00 Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 Leonard, Kathleen A Williams, Douglas F Thunell, Robert C MEDIAN LATITUDE: -30.499933 * MEDIAN LONGITUDE: -36.203933 * SOUTH-BOUND LATITUDE: -30.946800 * WEST-BOUND LONGITUDE: -38.041200 * NORTH-BOUND LATITUDE: -30.276500 * EAST-BOUND LONGITUDE: -35.285300 * DATE/TIME START: 1980-03-11T00:00:00 * DATE/TIME END: 1980-03-30T00:00:00 1983-05-27 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.812149 https://doi.org/10.1594/PANGAEA.812149 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.812149 https://doi.org/10.1594/PANGAEA.812149 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Leonard, Kathleen A; Williams, Douglas F; Thunell, Robert C (1983): Pliocene paleoclimatic and paleoceanographic history of the South Atlantic Ocean: stable isotopic records from Leg 72 Deep Sea Drilling Project Holes 516A and 517. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 895-906, https://doi.org/10.2973/dsdp.proc.72.145.1983 72-516A 72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/CONT RISE South Atlantic/FLANK Dataset 1983 ftpangaea https://doi.org/10.1594/PANGAEA.812149 https://doi.org/10.2973/dsdp.proc.72.145.1983 2023-01-20T07:33:00Z Stable isotopic analyses (18O/16O, 13C/12C) of both benthic and planktonic foraminifers from DSDP Holes 516A and 517 appear to reflect changing paleoclimatic and paleoceanographic conditions in the South Atlantic Ocean during the Pliocene. The d18O records of Cibicides wuellerstorfi and Globigerinoides sacculifer do not vary in phase with one another, indicating that the d18O of C. wuellerstorfi is reflecting changing glacial ice volumes, but the d18O of G. sacculifer is being influenced more by other factors, such as variable sea-surface temperatures and salinities. A net depletion in 18O and a series of very low-amplitude fluctuations characterize the late Pliocene planktonic d18O record. The stability of this section may be related to increasing surface-water temperatures in middle southern latitudes during northern hemisphere glacial ice buildup caused by differences in the phasing of the orbital precessional cycle between the northern and southern hemispheres. Hole 516A is presently located in an area of strong d13C gradients in the water column, and a similar situation probably prevailed during the Pliocene. A record of the difference between the d13C of C. wuellerstorfi and G. sacculifer (d13C) reflects times of increased or decreased similarity in d13C between Circumpolar Water and subtropical surface waters throughout the Pliocene. Periods of increased or decreased d13C may reflect: 1) changes in water mass boundaries because of expansion or contraction of a particular water mass, or 2) changes in the partitioning of 13C within the various components of the global carbon reservoir. These changes may be associated with glacial/interglacial climatic changes, such as the initiation of northern hemisphere glaciation. Dataset South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-38.041200,-35.285300,-30.276500,-30.946800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
72-516A 72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/CONT RISE South Atlantic/FLANK |
spellingShingle |
72-516A 72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/CONT RISE South Atlantic/FLANK Leonard, Kathleen A Williams, Douglas F Thunell, Robert C Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 |
topic_facet |
72-516A 72-517 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Leg72 South Atlantic/CONT RISE South Atlantic/FLANK |
description |
Stable isotopic analyses (18O/16O, 13C/12C) of both benthic and planktonic foraminifers from DSDP Holes 516A and 517 appear to reflect changing paleoclimatic and paleoceanographic conditions in the South Atlantic Ocean during the Pliocene. The d18O records of Cibicides wuellerstorfi and Globigerinoides sacculifer do not vary in phase with one another, indicating that the d18O of C. wuellerstorfi is reflecting changing glacial ice volumes, but the d18O of G. sacculifer is being influenced more by other factors, such as variable sea-surface temperatures and salinities. A net depletion in 18O and a series of very low-amplitude fluctuations characterize the late Pliocene planktonic d18O record. The stability of this section may be related to increasing surface-water temperatures in middle southern latitudes during northern hemisphere glacial ice buildup caused by differences in the phasing of the orbital precessional cycle between the northern and southern hemispheres. Hole 516A is presently located in an area of strong d13C gradients in the water column, and a similar situation probably prevailed during the Pliocene. A record of the difference between the d13C of C. wuellerstorfi and G. sacculifer (d13C) reflects times of increased or decreased similarity in d13C between Circumpolar Water and subtropical surface waters throughout the Pliocene. Periods of increased or decreased d13C may reflect: 1) changes in water mass boundaries because of expansion or contraction of a particular water mass, or 2) changes in the partitioning of 13C within the various components of the global carbon reservoir. These changes may be associated with glacial/interglacial climatic changes, such as the initiation of northern hemisphere glaciation. |
format |
Dataset |
author |
Leonard, Kathleen A Williams, Douglas F Thunell, Robert C |
author_facet |
Leonard, Kathleen A Williams, Douglas F Thunell, Robert C |
author_sort |
Leonard, Kathleen A |
title |
Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 |
title_short |
Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 |
title_full |
Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 |
title_fullStr |
Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 |
title_full_unstemmed |
Oxygen and carbon isotopes of Cibicides wuellerstorfi, Cibicides kullenbergi and Globigerinoides sacculifer at DSDP Holes 72-516A and 72-517 |
title_sort |
oxygen and carbon isotopes of cibicides wuellerstorfi, cibicides kullenbergi and globigerinoides sacculifer at dsdp holes 72-516a and 72-517 |
publisher |
PANGAEA |
publishDate |
1983 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.812149 https://doi.org/10.1594/PANGAEA.812149 |
op_coverage |
MEDIAN LATITUDE: -30.499933 * MEDIAN LONGITUDE: -36.203933 * SOUTH-BOUND LATITUDE: -30.946800 * WEST-BOUND LONGITUDE: -38.041200 * NORTH-BOUND LATITUDE: -30.276500 * EAST-BOUND LONGITUDE: -35.285300 * DATE/TIME START: 1980-03-11T00:00:00 * DATE/TIME END: 1980-03-30T00:00:00 |
long_lat |
ENVELOPE(-38.041200,-35.285300,-30.276500,-30.946800) |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Supplement to: Leonard, Kathleen A; Williams, Douglas F; Thunell, Robert C (1983): Pliocene paleoclimatic and paleoceanographic history of the South Atlantic Ocean: stable isotopic records from Leg 72 Deep Sea Drilling Project Holes 516A and 517. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 895-906, https://doi.org/10.2973/dsdp.proc.72.145.1983 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.812149 https://doi.org/10.1594/PANGAEA.812149 |
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.812149 https://doi.org/10.2973/dsdp.proc.72.145.1983 |
_version_ |
1766200515749740544 |