Stable isotope record of foraminifera from DSDP Hole 81-552A ...
It is now widely accepted that expansion of continental glaciers is one manifestation of profound paleoenvironmental change in latest Miocene time. The oxygen isotopic record in deep-sea cores is inferred to document brief pulses in glaciation, based on covariance of delta18O in benthic and plankton...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
1987
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| Online Access: | https://dx.doi.org/10.1594/pangaea.726744 https://doi.pangaea.de/10.1594/PANGAEA.726744 |
| Summary: | It is now widely accepted that expansion of continental glaciers is one manifestation of profound paleoenvironmental change in latest Miocene time. The oxygen isotopic record in deep-sea cores is inferred to document brief pulses in glaciation, based on covariance of delta18O in benthic and planktonic foraminifera, which probably lowered latest Miocene sea level by a minimum of 60 m. Additional evidence of glacial activity in the oxygen isotope record is obscured by the small signal amplitude. Before further details of paleoenvironmental change can be investigated it is essential to have a high-resolution stratigraphy and chronology. This has not been achieved previously because most studies of the latest Miocene have had a sampling interval greater than the duration of events they seek to resolve. A high-resolution stable isotope record from the north Atlantic (DSDP 552) is correlated with a second record from the southwest Pacific (DSDP 588). Each core has magnetostratigraphy, but there are two possible ... : Supplement to: Keigwin, Lloyd D (1987): Toward a high-resolution chronology for latest Miocene paleoceanographic events. Paleoceanography, 2(6), 639-660 ... |
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