Articles | Volume 11, issue 4
https://doi.org/10.5194/se-11-1475-2020
https://doi.org/10.5194/se-11-1475-2020
Research article
 | 
11 Aug 2020
Research article |  | 11 Aug 2020

Quantifying the buffering of oceanic oxygen isotopes at ancient midocean ridges

Yoshiki Kanzaki

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Short summary
This study evaluates the buffering of seawater oxygen isotopes at midocean ridges, using a process-based model of hydrothermal circulation and reactive transport of oxygen isotopes. The buffering intensity shown by the model is significantly weaker than previously assumed. Oxygen isotopes of oceanic crust are consistently relatively insensitive to seawater isotopic composition, which explains the ancient oceanic crust without invoking a constant seawater oxygen–isotopic composition through time.