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Detailed Reference Information |
Burov, E.B., Houdry, F., Diament, M. and Déverchère, J. (1994). A broken plate beneath the North Baikal Rift Zone revealed by gravity modelling. Geophysical Research Letters 21: doi: 10.1029/93GL03078. issn: 0094-8276. |
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We modelled a 1200 km long gravimetric profile in the North Baikal rift to assess the mechanical behavior of the lithosphere, using a numerical model that accounts for realistic brittle-elasto-ductile rheology. We use published seismicity and refraction data, a new 5'¿7.5' free-air/Bouguer gravity and topography data set, and a detailed map of faults obtained from high resolution SPOT imagery. Analysis of the gravity field over the North Baikal rift zone indicates significant asymmetry of the mechanical processes governing the deformation of the diverging sides of the rift. These anomalies cannot be explained by a conventional continuous plate undergoing extension beneath the rift zone, whereas a strong mechanical discontinuity (wedge shaped detachment zone beneath the rift axis) is able to reproduce observations. Such a discontinuous model provides a good fit to the gravity and crustal thickness data and explains the deep seismicity reported there. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Tectonophysics, Plate boundary structures and processes, Tectonophysics, Dynamics of the lithosphere and mantle, Tectonophysics, Continental tectonics, Geodesy and Gravity, Local gravity anomalies and crustal structure |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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