Volcanic evolution of an ultraslow-spreading ridge

H. H. Stubseid (), A. Bjerga, H. Haflidason, L. E. R. Pedersen and R. B. Pedersen
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H. H. Stubseid: University of Bergen
A. Bjerga: University of Bergen
H. Haflidason: University of Bergen
L. E. R. Pedersen: University of Bergen
R. B. Pedersen: University of Bergen

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Nearly 30% of ocean crust forms at mid-ocean ridges where the spreading rate is less than 20 mm per year. According to the seafloor spreading paradigm, oceanic crust forms along a narrow axial zone and is transported away from the rift valley. However, because quantitative age data of volcanic eruptions are lacking, constructing geological models for the evolution of ultraslow-spreading crust remains a challenge. In this contribution, we use sediment thicknesses acquired from ~4000 km of sub-bottom profiler data combined with 14C ages from sediment cores to determine the age of the ocean floor of the oblique ultraslow-spreading Mohns Ridge to reveal a systematic pattern of young volcanism outside axial volcanic ridges. Here, we present an age map of the upper lava flows within the rift valley of a mid-ocean ridge and find that nearly half of the rift valley floor has been rejuvenated by volcanic activity during the last 25 Kyr.

Date: 2023
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DOI: 10.1038/s41467-023-39925-0

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