Type |
Article |
Date |
2022-12 |
Language |
English |
Author(s) |
Wang Zhikai1, Singh Satish C.1 |
Affiliation(s) |
1 : Université Paris Cité, Institut de Physique du Globe de Paris, CNRS, 1 rue Jussieu, Paris, 75238, France |
Source |
Nature Communications (2041-1723) (Springer Science and Business Media LLC), 2022-12 , Vol. 13 , N. 1 , P. 7809 (12p.) |
DOI |
10.1038/s41467-022-35459-z |
WOS© Times Cited |
6 |
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 or due to focused melt migration to segment centres. Using wide-angle seismic data acquired from the equatorial Atlantic Ocean, here we show that the crustal thickness is nearly uniform (~5.5 km) across five crustal 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 facilitated by the long-offset transform faults in the equatorial Atlantic region and the presence of a high concentration of volatiles in the primitive melt in the mantle. |
Full Text |
File |
Pages |
Size |
Access |
Publisher's official version |
12 |
1 MB |
Open access |
Supplementary information |
22 |
3 MB |
Open access |
Peer Review File |
32 |
4 MB |
Open access |
|