Stable isotope record of Cibicidoides spp. from early and middle Miocene sediments ...

• Main Authors: Wright, James D, Miller, Kenneth G, Fairbanks, Richard G
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1992
• Subjects: Drilling/drill rig; Leg40; Leg81; Leg82; Leg94; Leg114; Glomar Challenger; Joides Resolution; Deep Sea Drilling Project DSDP; Ocean Drilling Program ODP; Fairbanks; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.728102; https://doi.pangaea.de/10.1594/PANGAEA.728102

The middle Miocene delta18O increase represents a fundamental change in the ocean-atmosphere system which, like late Pleistocene climates, may be related to deepwater circulation patterns. There has been some debate concerning the early to early middle Miocene deepwater circulation patterns. Specifically, recent discussions have focused on the relative roles of Northern Component Water (NCW) production and warm, saline deep water originating in the eastern Tethys. Our time series and time slice reconstructions indicate that NCW and Tethyan outflow water, two relatively warm deepwater masses, were produced from ~20 to 16 Ma. NCW was produced again from 12.5 to 10.5 Ma. Another feature of the early and middle Miocene oceans was the presence of a high delta13C intermediate water mass in the southern hemisphere, which apparently originated in the Southern Ocean. Miocene climates appear to be related directly to deepwater circulation changes. Deep-waters warmed in the early Miocene by ~3°C (?20 to 16 Ma) and ... : Supplement to: Wright, James D; Miller, Kenneth G; Fairbanks, Richard G (1992): Early and Middle Miocene stable isotopes: implications for deepwater circulation and climate. Paleoceanography, 7(3), 357-389 ...