Abstract
The the southwestern part of the Indian Ocean, where the Mozambique and Madagascar ridges are located was studied. The ideas about the tectonic structure of these ridges are still under debate. The anomalous structure of the crust of these ridges can be explained either by underplating (thickening of the oceanic crust from below due to magmatism), or by stretching and thinning of the continental crust. Based on the data on anomalous gravitational and magnetic fields, seismotomography, and other geological and geophysical information, density modeling was performed along four profiles, which revealed differences in the crustal structure and evolution of the Mozambique and Madagascar ridges.
Similar content being viewed by others
REFERENCES
Barthelmes, F., Definition of Functionals of the Geopotential and Their Calculation from Spherical Harmonic Models. Theory and Formulas Used by the Calculation Service of the International Centre for Global Earth Models (ICGEM), Germany: Sci. Techn. Rep. TR09. https://doi.org/10.2312/GFZ.b103-0902-26
Ben-Avraham, Z., Hartnady, C.J.H., and le Roex, A.P., Neotectonic activity on continental fragments in the Southwest Indian Ocean: Agulhas Plateau and Mozambique Ridge, J. Geophys. Res., 1995, vol. 100, B4, pp. 6199–6111.
Bulychev, A.A. and Zaitsev, A.N., Certificate of State Registration of Computer Program no. 2008611947 (18 April, 2008).
Bulychev, A.A., Gainanov, A.G., Gilod, D.A, et al., Quantitative interpretation of satellite geophysical data, Fiz. Zemli, 1996, no. 3, pp. 21–26.
Bulychev, A.A., Gilod, D.A., and Dubinin, E.P., Two-dimensional structural-density modelling of the tectonosphere structure in the southern part of the Indian Ocean, Geofiz. Issled., 2015, vol. 16, no. 4, pp. 15–35.
Coffin, M.F. and Eldholm, O., Large igneous provinces: Crustal structure, dimensions, and external consequences, Rev. Geophys., 1994, vol. 32, pp. 1–36.
Gajnanov, A.G. and Panteleev, V.L., Morskaya gravirazvedka (Marine Gravity Survey), Moscow: Nedra, 1991 [in Russian].
Gohl, K., Uenzelmann-Neben, G., and Grobys, N., Growth and dispersal of a Southeast African large igneous province, South Afr. J. Geol., 2012. https://doi.org/10.2113/gssajg.114.3-4.379
König, M. and Jokat, W., The Mesozoic breakup of the Weddell Sea, J. Geophys. Res., 2006, vol. 111. https://doi.org/10.1029/2005JB004035
Meyer, B., Chulliat, A., and Saltus, R., Derivation and Error Analysis of the Earth Magnetic Anomaly Grid at 2 arc min Resolution Vers. 3 (EMAG2v3), Geochem., Geophys., Geosyst., 2017, vol. 18, pp. 4522–4537. https://doi.org/10.1002/2017GC007280
Müller, D., Seton, M., Gaina, C., and Roest, W.R., Age, spreading rates, and spreading asymmetry of the world’s ocean crust, Geochem., Geophys., Geosyst., 2008, vol. 9, p. Q04006. https://doi.org/10.1029/2007GC001743
Reguzzoni, M. and Sampietro, D., GEMMA: An Earth crustal model based on GOCE satellite data, Int. J. Appl. Earth Observ. Geoinform., 2014. https://doi.org/10.1016/j.jag.2014.04.002
Sandwell, D.T., Müller, D., Smith, W.H.F., et al., New global marine gravity from CryoSat-2 and Jason-1 reveals buried tectonic structure, Science, 2014, vol. 346, no. 6205, pp. 65–67. https://doi.org/10.1126/science.1258213
Simmons, N.A., Myers, S.C., Johannesson, G., and Matzel, E., LLNL-G3Dv3: Global P wave tomography model for improved regional and teleseismic travel time prediction, J. Geophys. Res., 2012, vol. 117, no. B10. https://doi.org/10.1029/2012JB009525
Sorokhtin, O.G., Dependence of the Mid-Ocean Ridge topography on the spreading rate, Dokl. Akad. Nauk SSSR, 1973, vol. 208, no. 6, pp. 1338–1341.
Whittaker, J.M., Goncharov, A., Williams, S.E., et al., Global sediment thickness data set updated for the Australian–Antarctic southern ocean, Geochem., Geophys., Geosyst., 2013, vol. 14, no. 8, pp. 3297–3305. https://doi.org/10.1002/ggge.20181
Zhang, T., Lin, J., and Gao, J., Interactions between hotspots and the Southwest Indian Ridge during the last 90 Ma: implications on the formation of oceanic plateaus and intraplate seamounts, Sci. China Earth Sci., 2011, vol. 54. https://doi.org/10.1007/s11430-011-4219-9
Author information
Authors and Affiliations
Corresponding authors
Ethics declarations
The authors declare that they have no conflicts of interest.
Additional information
Translated by N. Astafiev
About this article
Cite this article
Ryzhova, D.A., Kosnyreva, M.V., Dubinin, E.P. et al. The Structure Tectonosphere of the Mozambique and Madagascar Ridges by Geophysical Data. Moscow Univ. Geol. Bull. 77, 18–27 (2022). https://doi.org/10.3103/S0145875222010124
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S0145875222010124