
Crustal thickness at the ultraslow-spreading Gakkel Ridge in the Arctic Ocean varies significantly, ranging from 3.3 km to 8.9 km, and has increased over the past 5 million years, contradicting predictions of passive mantle upwelling models.


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Results from a high-resolution ocean-bottom seismometer experiment at the ultraslow-spreading Gakkel Ridge show unexpected highly variable crustal thickness and a relatively large average value, which can be explained by an active mantle upwelling model.

Highly variable magmatic accretion at the ultraslow-spreading Gakkel Ridge - Nature

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Highly Variable Crustal Thickness Observed at the Ultraslow-Spreading Gakkel Ridge in the Arctic Ocean
