Evolution of the Crustal and Upper Mantle Seismic Structure From 0-27 Ma in the Equatorial Atlantic Ocean at 2° 43'S.

ABSTRACT: We present seismic tomographic results from a unique seismic refraction and wide-angle survey along a 600 km long flow-line corridor of oceanic lithosphere ranging in age from 0 to 27 Ma in the equatorial Atlantic Ocean at 2° 43'S. The velocities in the crust near the ridge axis rapidly increase in the first 6 Myr and then change gradually with age. The upper crust (Layer 2) thickness varies between 2 and 2.4 km with an average thickness of 2.2 km and the crustal thickness varies from 5.6 to 6 km along the profile with an average crustal thickness of 5.8 km. At some locations, we observe negative velocity anomalies (∼-0.3 km/s) in the lower crust which could be either due to chemical heterogeneity in gabbroic rocks and/or the effects of fault related deformation zones leading to an increas

SUBMITTER: Vaddineni VA 

PROVIDER: S-EPMC9285972 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature