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• W2029751421 abstract "The character of the basement and overlying sedimentary sequences in the vicinity of the Mid‐Faeroe Ridge is investigated through a synthesis of seismic velocity measurements. A finite difference tomographic algorithm was applied to a wide‐aperture seismic profile acquired across the center of the Faeroe Basin to produce a velocity model free from a priori artifacts. A series of parameterizations and smoothing constraints were run to assess the uniqueness of the final model. Uncertainties in the velocity structure were estimated at ±5%. Comparison of the in situ velocity of the Mid‐Faeroe Ridge with deterministic lithology‐velocity data extracted from nearby boreholes strongly implies that Tertiary to Cretaceous shale and sandstone sequences extend to depths of 4.5 km. The occurrence of pre‐Cretaceous sedimentary lithologies at 4.5–8.0 km depth is supported by in situ velocities of 4.0–4.5 km/s which are best explained by well‐consolidated sediments and are incompatible with likely constituents of the basement. Evidence for a major structural discordance across the southeastern flank of the Mid‐Faeroe Ridge is provided by a prominent fault whose location demarcates a lateral velocity variation of ∼0.5 km/s. A rapid increase of the in situ velocity at 8 km depth is strongly suggestive of a transition into the basement, whose velocity (5.5 km/s) is comparable with high‐pressure laboratory measurements of basalts from the Faeroe Islands. This basaltic basement in the center of the Faeroe Basin lies above a Moho depth of 18±3 km which suggests cumulative stretching factors of about 3.0 and implies substantial igneous activity. We conclude that in the region of the Mid‐Faeroe Ridge the prerift (Lewisian?) basement has been highly attenuated, pervasively intruded, and possibly wholly replaced by basaltic material." @default.
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• W2029751421 date "1997-04-10" @default.
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• W2029751421 title "Characterizing the Mid‐Faeroe Ridge using seismic velocity measurements" @default.
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• W2029751421 doi "https://doi.org/10.1029/96jb03809" @default.
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