Citation:

0377-8398(94)00028-L

Name: Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1)
Published: 1995
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

RIS Citation BibTeX Citation Text Citation Facebook TwitterShow Map Google Earth

Abstract:

An Oligocene-basal Miocene (Zones P19-P22/N4) oxygen and carbon isotope stratigraphy is presented based on mixed benthic foraminiferal faunas and different species of planktic foraminifers from Eastem Indian Ocean ODP Hole 758A. Lack of covariance in planktic and benthic delta18O ratios indicates that many Oligocene sea level fluctuations, including the major fall at 30 Ma, are not of glacio-eustatic origin. Delta18O values suggest that test morphology is a poor indicator of preferred depth habitat of Oligocene planktic foraminifers. Also, some groups show considerable shifts in preferred depth habitat. Reconstructed surface water temperature was nearly constant during the investigated period, but even assuming a large Antarctic icecap, values are unrealistically low, 18°-20°C. Most likely, water masses with markedly different oxygen isotopic composition existed, this poses great problems for quantitative temperature reconstructions.

Planktic foraminiferal species show similar delta13C ratios, indicating well-mixed surface waters. This contrasts with the strong oxygen isotopic gradient, which suggests well-stratified surface waters. During the Oligocene the difference in delta13C ratio between the average ratio of planktic foraminiferal species and the benthic foraminifers (Delta delta13C P-B') shows an inverse relation with the known circulation intensity record and thus with productivity. This Delta delta13C pattern is interpreted as being caused by the presence of younger bottom waters at this site during periods with lower temperatures and/or larger Antarctic ice sheets.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 5.384200 * Longitude: 90.361200

Date/Time Start: 1988-06-15T23:50:00 * Date/Time End: 1988-06-24T13:30:00

Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 45

Event(s):

121-758A * Latitude: 5.384200 * Longitude: 90.361200 * Date/Time Start: 1988-06-15T23:50:00 * Date/Time End: 1988-06-24T13:30:00 * Elevation: -2935.0 m * Penetration: 676.8 m * Recovery: 453.83 m * Location: Indian Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 73 cores; 676.8 m cored; 0 m drilled; 67.1 % recovery

Comment:

Test sizes >250 µm, plus some important 125-250 µm species from selected samples.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	ORDINAL NUMBER	Ord No				Geocode
2	Sample code/label	Sample label		van Eijden, AJM	DSDP/ODP/IODP sample designation
3	Foraminifera, benthic δ18O	Foram benth δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
4	Foraminifera, benthic δ13C	Foram benth δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
5	Catapsydrax dissimilis, δ18O	C. dissimilis δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
6	Catapsydrax dissimilis, δ13C	C. dissimilis δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
7	Catapsydrax spp., δ18O	Catapsydrax spp. δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
8	Catapsydrax spp., δ13C	Catapsydrax spp. δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
9	Catapsydrax unicavus, δ18O	C. unicavus δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
10	Catapsydrax unicavus, δ13C	C. unicavus δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
11	Fohsella kugleri, δ18O	F. kugleri δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
12	Fohsella kugleri, δ13C	F. kugleri δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
13	Globigerina euapertura, δ18O	G. euapertura δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
14	Globigerina euapertura, δ13C	G. euapertura δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
15	Globigerina galavisi, δ18O	G. galavisi δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
16	Globigerina galavisi, δ13C	G. galavisi δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
17	Globigerina tripartita, δ18O	G. tripartita δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
18	Globigerina tripartita, δ13C	G. tripartita δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
19	Jenkinsella spp., δ18O	Jenkinsella spp. δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
20	Jenkinsella spp., δ13C	Jenkinsella spp. δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
21	Globigerina sellii, δ18O	G. sellii δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
22	Globigerina sellii, δ13C	G. sellii δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
23	Globigerina binaiensis, δ18O	G. binaiensis δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
24	Globigerina binaiensis, δ13C	G. binaiensis δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
25	Globorotaloides suteri, δ18O	G. suteri δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
26	Globorotaloides suteri, δ13C	G. suteri δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
27	Foraminifera, planktic δ18O	Foram plankt δ18O	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
28	Foraminifera, planktic δ13C	Foram plankt δ13C	‰ PDB	van Eijden, AJM	Mass spectrometer Finnigan MAT 251
29	Comment	Comment		van Eijden, AJM

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

418 data points

Download Data

Download dataset as tab-delimited text — use the following character encoding:

View dataset as HTML