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Flower, Benjamin P; Kennett, James P (1993): Stable isotope ratios of foraminifera from DSDP Hole 90-588A (Table 2). PANGAEA, https://doi.org/10.1594/PANGAEA.52716, Supplement to: Flower, BP; Kennett, JP (1993): Middle Miocene ocean-climate transition: high-resolution oxygen and carbon isotopic records from Deep Sea Drilling Project Site 588A, southwest Pacific. Paleoceanography, 8(6), 811-843, https://doi.org/10.1029/93PA02196

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Abstract:
High-resolution stable isotopic records are presented for the epi-benthic foraminifer Cibicidoides, the inferred shallow-dwelling planktonic Globigerinoides quadrilobatus, and the inferred deep-dwelling planktonic Globoquadrina dehiscens from the middle Miocene (~16-12 Ma) of Deep Sea Drilling Project site 588A, Lord Howe Rise, southwest Pacific. High-resolution, multiple species oxygen and carbon isotopic data define the timing and character of the well-known middle Miocene climatic-oceanographic transition with a resolution comparable to Quaternary records. The benthic foraminiferal delta18O record is marked by several large fluctuations from ~16 to 14.8 Ma, followed by a series of rapid (<50 kyr) delta18O increases that suggest a new state of the ocean-climate system after 14.8 Ma. The total middle Miocene benthic oxygen isotopic increase of 1.2 per mil is largely incorporated in two steps, an increase of 0.8 per mil from 14.5 to 14.0 Ma and a second increase of 0.7 per mil from 13.45 to 12.45 Ma. Each step is comprised of a series of marked delta18O increases, indicative of rapid East Antarctic ice sheet growth and contemporaneous deepwater cooling. A strong covariance of 0.7 per mil between the benthic and deep-dwelling planktonic species from 14.5 to 14.0 Ma (including a rapid increase from 14.1 to 14.05 Ma) suggests a 0.7 per mil increase in the delta18O composition of seawater (delta18Osw) because of East Antarctic ice sheet growth. Comparison of the delta18O record of Gs. quadrilobatus suggests that surface waters warmed at this site by ~3°C from 14.1 to 13.6 Ma. Carbon isotopic time series for each species generally covary throughout the early to middle Miocene interval (~16-12 Ma), confirming that delta13C variations in this interval largely represent reservoir changes. High-resolution delta13C data allow improved resolution of the latter five of six delta13C maxima within the well-known early to middle Miocene carbon isotopic excursion (the Monterey Carbon Isotopic Excursion from 17.0 to 13.5 Ma). This is useful for global correlation. The last of these maxima ends with a 1 per mil decrease centered from 13.9 to 13.7 Ma, ~300 kyr after the delta18O increase considered to reflect East Antarctic ice growth. Covariance between benthic delta18O and delta13C from ~16 to 13.8 Ma suggests a sensitive relation between global carbon cycling and the ocean-climate system prior to 13.8 Ma. Episodic increases in organic carbon burial may have contributed to deep-sea benthic delta13C maxima and synchronous global cooling. The positive relationship ended at ~13.8 Ma, indicative of changing relations between global carbon cycling and the ocean-climate system brought on by the increased stability of the East Antarctic ice sheet after a major growth phase from 14.5 to 14.0 Ma.
Project(s):
Coverage:
Latitude: -26.111700 * Longitude: 161.226700
Date/Time Start: 1982-12-06T00:00:00 * Date/Time End: 1982-12-06T00:00:00
Minimum DEPTH, sediment/rock: 260.63 m * Maximum DEPTH, sediment/rock: 315.50 m
Event(s):
90-588A * Latitude: -26.111700 * Longitude: 161.226700 * Date/Time: 1982-12-06T00:00:00 * Elevation: -1533.0 m * Penetration: 344.4 m * Recovery: 84.3 m * Location: South Pacific/Tasman Sea/CONT RISE * Campaign: Leg90 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 103.8 m cored; 0 m drilled; 81.2 % recovery
Comment:
further isotope values of Cibicidoides spp. see Kennett (1986) dataset: doi:10.1594/PANGAEA.729767
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample labelFlower, Benjamin PDSDP/ODP/IODP sample designation
2DEPTH, sediment/rockDepthmFlower, Benjamin PGeocode
3AGEAgeka BPFlower, Benjamin PGeocode
4Cibicidoides wuellerstorfi, δ18OC. wuellerstorfi δ18O‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251> 63 µm
5Cibicidoides wuellerstorfi, δ13CC. wuellerstorfi δ13C‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251> 63 µm
6Cibicidoides coryelli, δ18OC. coryelli δ18O‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251> 63 µm
7Cibicidoides coryelli, δ13CC. coryelli δ13C‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251> 63 µm
8Cibicidoides mundulus, δ18OC. mundulus δ18O‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251> 63 µm
9Cibicidoides mundulus, δ13CC. mundulus δ13C‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251> 63 µm
10Globigerinoides quadrilobatus, δ18OG. quadril δ18O‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251300-400 µm
11Globigerinoides quadrilobatus, δ13CG. quadril δ13C‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251300-400 µm
12Globoquadrina dehiscens, δ18OG. dehiscens δ18O‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251300-400 µm
13Globoquadrina dehiscens, δ13CG. dehiscens δ13C‰ PDBFlower, Benjamin PMass spectrometer Finnigan MAT 251300-400 µm
Size:
3494 data points

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