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- W4213037941 abstract "Abstract The crustal accretion along mid-ocean ridges is known to be spreading-rate dependent. Along fast-spreading ridges, two-dimensional sheet-like mantle upwelling creates relatively uniform crust. In contrast, the crust formed along slow-spreading ridges shows large along-axis thickness variations with thicker crust at segment centres, which is hypothesised to be due a three-dimensional plume-like mantle upwelling with melt focusing to segment centres. Using wide-angle seismic data acquired from the equatorial Atlantic Ocean, we show that the crustal thickness is nearly uniform (~5.5 km) across five segments for crust formed at the slow-spreading Mid-Atlantic Ridge with age varying from 8 to 70 Ma. The crustal velocities indicate that this crust is predominantly of magmatic origin. We suggest that this uniform magmatic crustal accretion is due to a two-dimensional sheet-like mantle upwelling, contradicting previous hypothesis. Our results also indicate that the lateral extend of magmatic accretion could be used to define the sheet-like mantle upwelling regions beneath the global ridge system." @default.
- W4213037941 created "2022-02-24" @default.
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- W4213037941 date "2022-02-21" @default.
- W4213037941 modified "2023-10-15" @default.
- W4213037941 title "Seismic evidence for uniform crustal accretion along slow-spreading ridges in the equatorial Atlantic Ocean" @default.
- W4213037941 doi "https://doi.org/10.21203/rs.3.rs-1366304/v1" @default.
- W4213037941 hasPublicationYear "2022" @default.
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