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Crustal structure of a super-slow spreading centre: a seismic refraction study of Mohns Ridge, 72 degrees N ArchiMer
Klingelhofer, Frauke; Geli, Louis; Matias, Luis; Steinsland, N; Mohr, J.
A series of eight high-resolution seismic refraction profiles from the ultra-slow spreading (16 mm yr(-1) full spreading rate) Mohns Ridge in the Norwegian-Greenland Sea has been treated with modern inversion methods. The profiles were shot parallel to the ridge at an off-axis distance of 0-135 km corresponding to crustal ages of 0-22 Ma. The resulting models are constrained by synthetic seismograms and gravity modelling.The crustal thickness in all profiles is well below the global average for typical oceanic crust, and shows a high variability with a mean thickness of 4.0 +/- 0.5 km. This is mainly due to a very thin and variable lower crustal layer (Layer 3). Generally, the crust is thicker beneath basement highs and thinner beneath basins, implying...
Tipo: Text Palavras-chave: Seismic refraction; Oceanic crust; Mohns Ridge; Mantle.
Ano: 2000 URL:
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