(Table 1) Strontium isotope ratios of planktonic foraminifera and ostracoda from ODP Hole 120-748B on the Kerguelen Plateau, Indian Ocean
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| Autores principales: | , , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
1999
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| _version_ | 1867169003701534720 |
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| author | Zachos, James C Opdyke, Bradley N Quinn, Terrence Michael Jones, Charles E Halliday, Alex N |
| author_facet | Zachos, James C Opdyke, Bradley N Quinn, Terrence Michael Jones, Charles E Halliday, Alex N |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Stable and radiogenic isotopic and sedimentological data from sub-Antarctic deep sea sediment cores reveal a temporal link between changes in seawater 87Sr/86Sr ratios and major episodes of late Eocene-early Oligocene climate change. The 87Sr/86Sr records show two major inflections, one at 38-39 Ma near the middle/late Eocene boundary, followed by another at 33.4 Ma. Similarly, the oxygen isotope, ice-rafted debris, and clay assemblage records indicate two important climatic events: the appearance of alpine glaciers and/or small ice-sheets on Antarctica in the late Eocene at 38-39 Ma, followed by a rapid transition to larger and more permanent temperate ice-sheets in the early Oligocene at 33.4 Ma. Moreover, during the early Oligocene 30-33 Ma. three to four inferred peaks in glacial activity appear to coincide with subtle steps in the 87Sr/86Sr record. The coupled variations in climate and seawater Sr isotope ratios during the Eocene/Oligocene imply a strong causal link between the two. Either changes in climate directly influenced patterns of continental weathering and hence seawater chemistry, and/or a tectonic event e.g., uplift.as reflected in weathering and seawater chemistry triggered relatively abrupt changes in global climate. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_695370 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Strontium isotope ratios of planktonic foraminifera and ostracoda from ODP Hole 120-748B on the Kerguelen Plateau, Indian Ocean Zachos, James C Opdyke, Bradley N Quinn, Terrence Michael Jones, Charles E Halliday, Alex N 120-748B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg120; Ocean Drilling Program; ODP; Sample code/label; Sample type; South Indian Ridge, South Indian Ocean; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error Stable and radiogenic isotopic and sedimentological data from sub-Antarctic deep sea sediment cores reveal a temporal link between changes in seawater 87Sr/86Sr ratios and major episodes of late Eocene-early Oligocene climate change. The 87Sr/86Sr records show two major inflections, one at 38-39 Ma near the middle/late Eocene boundary, followed by another at 33.4 Ma. Similarly, the oxygen isotope, ice-rafted debris, and clay assemblage records indicate two important climatic events: the appearance of alpine glaciers and/or small ice-sheets on Antarctica in the late Eocene at 38-39 Ma, followed by a rapid transition to larger and more permanent temperate ice-sheets in the early Oligocene at 33.4 Ma. Moreover, during the early Oligocene 30-33 Ma. three to four inferred peaks in glacial activity appear to coincide with subtle steps in the 87Sr/86Sr record. The coupled variations in climate and seawater Sr isotope ratios during the Eocene/Oligocene imply a strong causal link between the two. Either changes in climate directly influenced patterns of continental weathering and hence seawater chemistry, and/or a tectonic event e.g., uplift.as reflected in weathering and seawater chemistry triggered relatively abrupt changes in global climate. |
| title | (Table 1) Strontium isotope ratios of planktonic foraminifera and ostracoda from ODP Hole 120-748B on the Kerguelen Plateau, Indian Ocean |
| topic | 120-748B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg120; Ocean Drilling Program; ODP; Sample code/label; Sample type; South Indian Ridge, South Indian Ocean; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error |
| url | https://doi.org/10.1594/PANGAEA.695370 |