Citation:

S0031-0182(03)00617-5

Name: Planktonic foraminiferal abundances and stable isotope ratios in middle Miocene sediments of the North Atlantic and the southwestern Pacific
Published: 2003
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

A three-fold expansion of the Antarctic ice sheet at 13.60, 12.82, and 11.60 Ma has been inferred from delta18O maxima analyzed in planktonic and benthic foraminiferal tests, although accompanying changes in sea surface temperature have not been detailed. We present estimated changes in middle Miocene surface-water temperatures based on analysis of delta18O in planktonic foraminifera collected at mid-latitude Deep Sea Drilling Project sites in the North Atlantic and South Pacific oceans. We also identify periods of ice-sheet growth based on comparisons of benthic and planktonic foraminiferal delta18O values. Our results indicate: (1) a distinct cooling of the sea surface from 13.6 to 13.5 Ma immediately following a peak in ice volume at 13.6 Ma, (2) a cooling of the sea surface during a period of increasing ice volume from 13.2 to 13.0 Ma, and (3) a development of the Antarctic ice sheet during a period of cooling of the sea surface centered at 11.6 Ma.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Median Latitude: 13.235220 * Median Longitude: -92.509100 * South-bound Latitude: -31.167000 * West-bound Longitude: 163.358500 * North-bound Latitude: 42.836700 * East-bound Longitude: -23.087500

Date/Time Start: 1982-12-15T00:00:00 * Date/Time End: 1983-07-13T00:00:00

Event(s):

90-590_Site * Latitude: -31.167000 * Longitude: 163.358500 * Date/Time: 1982-12-15T00:00:00 * Elevation: -1299.0 m * Penetration: 8.061 m * Recovery: 7.161 m * Location: South Pacific/Tasman Sea/CONT RISE * Campaign: * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 82 cores; 770.3 m cored; 9.6 m drilled; 93% recovery

90-590B * Latitude: -31.167000 * Longitude: 163.358500 * Date/Time: 1982-12-15T00:00:00 * Elevation: -1299.0 m * Penetration: 499.1 m * Recovery: 464.6 m * Location: South Pacific/Tasman Sea/CONT RISE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 499.1 m cored; 0 m drilled; 93.1 % recovery

94-608 * Latitude: 42.836700 * Longitude: -23.087500 * Date/Time: 1983-07-13T00:00:00 * Elevation: -3526.0 m * Penetration: 530.3 m * Recovery: 428.3 m * Location: North Atlantic/FLANK * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 59 cores; 529.3 m cored; 0 m drilled; 80.9 % recovery

License:

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

Size:

5 datasets

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Datasets listed in this publication series

Ohta, S; Kaiho, K; Takei, T (2003): (Table 1) Age model of the middle Miocene section of DSDP Site 90-590_Site in the southwestern Pacific. https://doi.org/10.1594/PANGAEA.695361
Ohta, S; Kaiho, K; Takei, T (2003): (Table 4) Distribution of planktonic foraminifera in middle Miocene sediments of DSDP Hole 90-590B in the southwestern Pacific. https://doi.org/10.1594/PANGAEA.695365
Ohta, S; Kaiho, K; Takei, T (2003): (Table 3) Stable carbon and oxygen isotope ratios of planktonic foraminifera in middle Miocene sediments of DSDP Hole 94-608 in the North Atlantic. https://doi.org/10.1594/PANGAEA.695364
Ohta, S; Kaiho, K; Takei, T (2003): (Table 4) Distribution of planktonic foraminifera in middle Miocene sediments of DSDP Hole 94-608 in the North Atlantic. https://doi.org/10.1594/PANGAEA.695366
Ohta, S; Kaiho, K; Takei, T (2003): (Table 1) Age model of the middle Miocene section of DSDP Site 94-608_Site in the North Atlantic. https://doi.org/10.1594/PANGAEA.695362