Three-dimensional density model of the structure of the Southwest Indian Ridge tectonosphere

Category: 14-3
A.A. Bulychev, D.A. Gilod

 

УДК 550.831 

 

 

A.A. Bulychev, D.A. Gilod 

Lomonosov Moscow State University, Moscow, Russia

 

Abstract

The technique and the results of 3D gravity modeling of the structure of the Southwest Indian Ridge tectonosphere are presented. 3D density models of the tectonosphere are based on the results of previous structural analysis of the gravity and magnetic fields, and 2D density models along a number of profiles crossing main segments of the Ridge. The results of 3D density modeling are maps of the Moho discontinuity and density distribution in the oceanic crust.

Keywords: Southwest Indian Ridge, gravity anomalies, density modeling, tectonosphere.

 

References

Berezkin, V.M., Metod polnogo gradienta v geofizicheskoy razvedke (Complete gradient technique in geophysical survey), Moscow: Nedra, 1988, 188 p.

Bulychev, A.A., Gilod, D.A., and Sokolova, T.B., Analysis of gravitational and magnetic field and seismic tomography data of the southwest segment of the Indian ocean, Geofizika, 2011, no. 4, pp. 44–56.

Bulychev, A.A., Gilod, D.A., Krivosheya, K.V., Zaitsev, A.N., and Shreider, A.A., 3D modeling of the tectonosphere in the Romanche transform zone (the Equatorial Atlantic) based on gravimetry data, Vestn. Mosk. Un-ta, Series 4 Geology, 2005, no. 5, pp. 74–80.

Dubinin, E.P., Galushkin, Yu.I., and Sveshnikov, A.A., Deep structure of rift zone lithosphere of spreading ridges, Zhizn Zemli: coll. Scientific works of MSU Geosciences Museum, Moscow: Izd-vo MGU, 2010a, pp. 32–53.

Dubinin, E.P., Galushkin, Yu.I., and Sveshnikov, A.A., The model of oceanic crust accretion and its geodynamic effects, Zhizn Zemli: coll. Scientific works of MSU Geosciences Museum, Moscow: Izd-vo MGU, 2010b, pp. 53–82.

Gilod, D.A. and Bulychev, A.A., 2D density modeling of the tectonosphere of the southwest segment structures of the Indian ocean, Geofizika, 2013, no. 1, pp. 55–66.

Lukashevich, I.P. and Pristavakina, E.I., Density model of the upper mantle under the oceans, Fizika Zemli, 1984, no. 2, pp. 103–107.

Mégnin, С. and Romanowicz, B., The shear velocity structure of the mantle from the inversion of body, surface and higher modes waveforms, Geophys. J. Int., 2000, vol. 143, pp. 709–728, www.seismo.berkeley.edu.

Muller, R.D., Roest, W.R., Royer, J.-Yv., Gahagan, L.M. and Sclater J.G., Digital isochrones of the world’s ocean floor, J. Geophys. Res., 1997, vol. 102, no. B2, pp. 3211–3214.

Sandwell, D.T. and Smith, W.H.F., Retracking ERS-1 Altimeter Waveforms for Optimal Gravity Field Recovery, Geophys. J. Int., 2005, vol. 163, pp. 79–89.

 

Smith, W.H.F. and Sandwell D.T., Global Seafloor Topography from Satellite Altimetry and Ship Depth Soundings, Science, 1997, vol. 277, no 5334, pp. 1956–1962.