Planktonic foraminiferal abundances and stable isotope ratios in middle Miocene sediments of the North Atlantic and the southwestern Pacific
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| Auteurs principaux: | , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2003
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| _version_ | 1867167660066734080 |
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| author | Ohta, Satoshi Kaiho, Kunio Takei, Tomohiro |
| author_facet | Ohta, Satoshi Kaiho, Kunio Takei, Tomohiro |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_695369 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Planktonic foraminiferal abundances and stable isotope ratios in middle Miocene sediments of the North Atlantic and the southwestern Pacific Ohta, Satoshi Kaiho, Kunio Takei, Tomohiro 90-590_Site; 90-590B; 94-608; 94-608_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg90; Leg94; North Atlantic/FLANK; South Pacific/Tasman Sea/CONT RISE 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. |
| title | Planktonic foraminiferal abundances and stable isotope ratios in middle Miocene sediments of the North Atlantic and the southwestern Pacific |
| topic | 90-590_Site; 90-590B; 94-608; 94-608_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg90; Leg94; North Atlantic/FLANK; South Pacific/Tasman Sea/CONT RISE |
| url | https://doi.org/10.1594/PANGAEA.695369 |