Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807
A numerical model which describes oxygen isotope exchange during burial and recrystallization of deep-sea carbonate is used to obtain information on how sea surface temperatures have varied in the past by correcting measured d18O values of bulk carbonate for diagenetic overprinting. Comparison of bu...
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1995
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.707926 2024-09-15T18:24:30+00:00 Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 Schrag, Daniel P DePaolo, Donald J Richter, Frank M MEDIAN LATITUDE: -4.947333 * MEDIAN LONGITUDE: -85.562125 * SOUTH-BOUND LATITUDE: -30.276300 * WEST-BOUND LONGITUDE: 156.625000 * NORTH-BOUND LATITUDE: 5.678000 * EAST-BOUND LONGITUDE: -19.851300 * DATE/TIME START: 1975-02-22T00:00:00 * DATE/TIME END: 1990-03-02T00:00:00 1995 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.707926 https://doi.org/10.1594/PANGAEA.707926 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.707926 https://doi.org/10.1594/PANGAEA.707926 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Schrag, Daniel P; DePaolo, Donald J; Richter, Frank M (1995): Reconstructing past sea surface temperatures; correcting for diagenesis of bulk marine carbon. Geochimica et Cosmochimica Acta, 59(11), 2265-2278, https://doi.org/10.1016/0016-7037(95)00105-9 111-677A 130-807 41-366 72-516 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg111 Leg130 Leg41 Leg72 North Atlantic/CONT RISE North Pacific Ocean Ocean Drilling Program ODP South Atlantic/CONT RISE dataset publication series 1995 ftpangaea https://doi.org/10.1594/PANGAEA.70792610.1016/0016-7037(95)00105-9 2024-07-24T02:31:42Z A numerical model which describes oxygen isotope exchange during burial and recrystallization of deep-sea carbonate is used to obtain information on how sea surface temperatures have varied in the past by correcting measured d18O values of bulk carbonate for diagenetic overprinting. Comparison of bulk carbonate and planktonic foraminiferal d18O records from ODP site 677A indicates that the oxygen isotopic composition of bulk carbonate does reflect changes in sea surface temperature and d18O. At ODP Site 690, we calculate that diagenetic effects are small, and that both bulk carbonate and planktonic foraminiferal d18O records accurately reflect Paleogene warming of high latitude surface oceans, biased from diagenesis by no more than 1°C. The same is likely to be true for other high latitude sites where sedimentation rates are low. At DSDP sites 516 and 525, the effects of diagenesis are more significant. Measured d18O values of Eocene bulk carbonates are more than 2‰ lower at deeply buried site 516 than at site 525, consistent with the model prediction that the effects of diagenesis should be proportional to sedimentation rate. Model-corrections reconcile the differences in the data between the two sites; the resulting paleotemperature reconstruction indicates a 4°C cooling of mid-latitude surface oceans since the Eocene. At low latitudes, the contrast in temperature between the ocean surface and bottom makes the carbonate d180 values particularly sensitive to diagenetic effects; most of the observed variations in measured d18O values are accounted for by diagenetic effects rather than by sea surface temperature variations. We show that the data are consistent with constant equatorial sea surface temperatures through most of the Cenozoic, with the possible exception of the early Eocene, when slightly higher temperatures are indicated. We suggest that the lower equatorial sea surface temperatures for the Eocene and Oligocene reported in other oxygen isotope studies are artifacts of diagenetic recrystallization, ... Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(156.625000,-19.851300,5.678000,-30.276300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
111-677A 130-807 41-366 72-516 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg111 Leg130 Leg41 Leg72 North Atlantic/CONT RISE North Pacific Ocean Ocean Drilling Program ODP South Atlantic/CONT RISE |
spellingShingle |
111-677A 130-807 41-366 72-516 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg111 Leg130 Leg41 Leg72 North Atlantic/CONT RISE North Pacific Ocean Ocean Drilling Program ODP South Atlantic/CONT RISE Schrag, Daniel P DePaolo, Donald J Richter, Frank M Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 |
topic_facet |
111-677A 130-807 41-366 72-516 COMPCORE Composite Core Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg111 Leg130 Leg41 Leg72 North Atlantic/CONT RISE North Pacific Ocean Ocean Drilling Program ODP South Atlantic/CONT RISE |
description |
A numerical model which describes oxygen isotope exchange during burial and recrystallization of deep-sea carbonate is used to obtain information on how sea surface temperatures have varied in the past by correcting measured d18O values of bulk carbonate for diagenetic overprinting. Comparison of bulk carbonate and planktonic foraminiferal d18O records from ODP site 677A indicates that the oxygen isotopic composition of bulk carbonate does reflect changes in sea surface temperature and d18O. At ODP Site 690, we calculate that diagenetic effects are small, and that both bulk carbonate and planktonic foraminiferal d18O records accurately reflect Paleogene warming of high latitude surface oceans, biased from diagenesis by no more than 1°C. The same is likely to be true for other high latitude sites where sedimentation rates are low. At DSDP sites 516 and 525, the effects of diagenesis are more significant. Measured d18O values of Eocene bulk carbonates are more than 2‰ lower at deeply buried site 516 than at site 525, consistent with the model prediction that the effects of diagenesis should be proportional to sedimentation rate. Model-corrections reconcile the differences in the data between the two sites; the resulting paleotemperature reconstruction indicates a 4°C cooling of mid-latitude surface oceans since the Eocene. At low latitudes, the contrast in temperature between the ocean surface and bottom makes the carbonate d180 values particularly sensitive to diagenetic effects; most of the observed variations in measured d18O values are accounted for by diagenetic effects rather than by sea surface temperature variations. We show that the data are consistent with constant equatorial sea surface temperatures through most of the Cenozoic, with the possible exception of the early Eocene, when slightly higher temperatures are indicated. We suggest that the lower equatorial sea surface temperatures for the Eocene and Oligocene reported in other oxygen isotope studies are artifacts of diagenetic recrystallization, ... |
format |
Other/Unknown Material |
author |
Schrag, Daniel P DePaolo, Donald J Richter, Frank M |
author_facet |
Schrag, Daniel P DePaolo, Donald J Richter, Frank M |
author_sort |
Schrag, Daniel P |
title |
Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 |
title_short |
Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 |
title_full |
Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 |
title_fullStr |
Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 |
title_full_unstemmed |
Age and oxygen isotope data for bulk carbonate from DSDP Sites 41-366 and 72-516 and ODP Sites 111-677A and 130-807 |
title_sort |
age and oxygen isotope data for bulk carbonate from dsdp sites 41-366 and 72-516 and odp sites 111-677a and 130-807 |
publisher |
PANGAEA |
publishDate |
1995 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.707926 https://doi.org/10.1594/PANGAEA.707926 |
op_coverage |
MEDIAN LATITUDE: -4.947333 * MEDIAN LONGITUDE: -85.562125 * SOUTH-BOUND LATITUDE: -30.276300 * WEST-BOUND LONGITUDE: 156.625000 * NORTH-BOUND LATITUDE: 5.678000 * EAST-BOUND LONGITUDE: -19.851300 * DATE/TIME START: 1975-02-22T00:00:00 * DATE/TIME END: 1990-03-02T00:00:00 |
long_lat |
ENVELOPE(156.625000,-19.851300,5.678000,-30.276300) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Schrag, Daniel P; DePaolo, Donald J; Richter, Frank M (1995): Reconstructing past sea surface temperatures; correcting for diagenesis of bulk marine carbon. Geochimica et Cosmochimica Acta, 59(11), 2265-2278, https://doi.org/10.1016/0016-7037(95)00105-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.707926 https://doi.org/10.1594/PANGAEA.707926 |
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.70792610.1016/0016-7037(95)00105-9 |
_version_ |
1810464873094578176 |