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• W2908784202 abstract "The late Miocene witnessed the tectonic uplift of the Isthmus of Panama, the onset of modern-like thermohaline circulation, changes in global patterns of deep-sea sedimentation, and a negative shift of ~1‰ in the carbon isotopic composition (δ13C) of marine carbonate sediments. Although previous work has attributed the late Miocene carbon isotopic shift (LMCS) to biological and environmental factors, the reasons for this apparent shift in the global carbon cycle remain incompletely understood. Here we combine both core-based sedimentological and isotopic data from three Walvis Ridge sites in the southeastern Atlantic Ocean with macrostratigraphic data from the entire Atlantic basin to show that the LMCS marks the establishment of modern, glacial/interglacial seawater carbonate saturation levels in the Atlantic. Between 10 and 7 million years ago (Ma) the Atlantic Ocean shows a trend of increasing seafloor area preserving deep-sea carbonate sediments. Neogene carbonate sedimentation in the Atlantic Ocean peaked at 7 Ma, coinciding with a δ13C shift of approximately −0.8‰ in Walvis Ridge benthic foraminifera, similar to the magnitude of LMCS. Northern-sourced waters in the late Miocene likely shifted seawater carbonate chemistry throughout the Atlantic basin by introducing bottom waters with higher carbonate ion concentrations. LMCS reflects the introduction of a carbonate ion effect on North Atlantic Deep Water (NADW) by increasing Northern Hemisphere glacial carbonate weathering. A carbonate ion flux to the Labrador Seawater contribution of NADW raises the possibility of a carbonate burial-mediated feedback with the global climate system that led to additional cooling during the Miocene-Pliocene transition." @default.
• W2908784202 created "2019-01-25" @default.
• W2908784202 creator A5042090266 @default.
• W2908784202 creator A5050269383 @default.
• W2908784202 date "2019-03-01" @default.
• W2908784202 modified "2023-09-27" @default.
• W2908784202 title "Influence of increasing carbonate saturation in Atlantic bottom water during the late Miocene" @default.
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• W2908784202 doi "https://doi.org/10.1016/j.palaeo.2019.01.006" @default.
• W2908784202 hasPublicationYear "2019" @default.
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