Two-dimensional modeling of the structure and density of tectonosphere in the south segment of the Indian Ocean
Category: 16-4UDC 550.831,838; 551.241
A.A. Bulychev, D.A. Gilod, E.P. Dubinin
Lomonosov Moscow State University, Moscow, Russia
Abstract. The structure of the tectonosphere in the south segment of the Indian Ocean is studied using gravity data. Several profiles intersecting large tectonic structures of the studied region were reproduced in 2D modeling of structure and density using Bouguer anomaly maps, bathymetry, age and seismic tomography data, as well as the results of the gravity and magnetic fields structural analysis. The paper discusses the results of 2D gravity modeling.
Keywords: 2D gravity modeling, Indian Ocean, tectonosphere, Kerguelen plateau, Crozet Islands, Conrad.
References
Beriozkin V.M. Metod polnogo gradienta v geofizicheskoi razvedke (Full gradient method in geophysical prospecting). Moscow: Nedra, 1988, 188p.
Bulychev A.A. and Gilod D.A. Two-dimensional gravity modeling of the tectonosphere of the American-Antarctic ridge. Moscow University Geology Bulletin, 2009, Geology, no. 5. pp. 36 – 48.
Bulychev A.A. and Gilod D.A. Two-dimensional density modeling of the tectonosphere of the structures of the South-Western sector of the Indian ocean. Geophysics, 2013. no. 1, pp. 55 - 66.
Bulychev A.A. and Zaitsev A.N. Interactive fitting program for a two-dimensional density of the environment by anomalous gravitational field. The certificate of state registration of the computer program. No. 2008611947. 18.04.2008 issued.
Bulychev A.A., Gilod D.A., and Dubinin E.P. Structural zonation of the lithosphere of the Eastern Indian ocean according to the analysis of anomalous gravitational and magnetic fields in The life of the Earth: physical geography, ecology, geodynamics, museology (Collection of scientific works of MSU Geosciences Museum. Vol. 35/36, under the editorship of V. A. Sadovnikova, A. V. Smurova), Moscow, MSU Publishing house, 2014, pp. 150–178.
Bulychev A.A., Krivosheia K.V., Melikhov V.R., and Zaltsman R.V. The calculation of the anomalous gravitational potential and its derivatives on the sphere. Moscow University Geology Bulletin, 1998. Geology, no. 2. pp. 42 – 46.
Lukashevich I.P. and Pristavakina E.I. Density model of the upper mantle under the oceans. Izv. Phys. Solid Earth, 1984, no. 2. pp. 103-107.
Bénard, F., Callot, J. P., Vially, R., Schmitz, J., Roest, W., Patriat, M., and Loubrieu, B. The Kerguelen plateau: Records from a long-living/composite microcontinent, Marine and Petroleum Geology, 2009, doi: 10.1016/j.marpetgeo, 2009.08.011, pp. 1–17 (www.elsevier.com/locate/marpetgeo).
Charvis P. and Operto S. Structure of the Cretaceous Kerguelen Volcanic Province (southern Indian Ocean) from wide-angle seismic data, Journal of Geodynamics, 1999, vol. 28, no. 1, pp. 51–71.
Crosby G. and McKenzie D. An analysis of young ocean depth, gravity and global residual topography, Geophys. J. Int, 2009, vol. 178, no. 3, pp. 1198–1219.
Frey, F.A., Coffin, M.F., Wallace, P.J., Weis, D., Zhao, X., Wise Jr., S.R., Antretter, M. Origin and evolution of a submarine large igneous province: the Kerguelen Plateau and Broken Ridge, southern Indian Ocean, Earth Planet. Sci. Lett, 2000, vol. 176, pp. 73–89.
Gladczenko T.P. and Coffin M.F. Kerguelen Plateau crustal structure and basin formation from seismic and gravity data, J. Geophys. Res., 2001, vol. 106, Is. B8, pp. 16583–16601.
Gohl K., Leitchenkov G.L., Parsiegla N., Ehlers B.M., Kopsch C., Damaske D., Guseva Y.B. and Gandyukhin V.V. Crustal types and continent-ocean boundaries between the Kerguelen Plateau and Prydz Bay, East Antarctica in Proceedings of the 10th International Symposium on Antarctic Earth Sciences, Santa Barbara, U.S. Geological Survey and The National Academies; USGS OF-2007-1047, Extended Abstract 038.
Maus S., Barckhausen U., Berkenbosch H., Bournas N., Brozena J., Childer V., Dostaler F., Fairhead J. D., Finn C., von Freese R. R. B., Gaina C., Golynsky S., Kucks R., Lühr H., Milligan P., Mogren S., Müller D., Olesen O., Pilkington M., Saltus R., Schreckenberger B., Thébault E., and Caratori Tontini F. A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements, Geochemistry, Geophysics, Geosystems (an electronic journal of the earth sciences), 2009, vol. 10, no. 8, 12 p. (http://www.geomag.org/models/emag2.html).
Mégnin C. and Romanowicz B. The three-dimensional shear velocity structure of the mantle from the inversion of body, surface and higher-mode waveforms, Geophys. J. Int., 2000, vol. 143, Is. 3, pp.709–728 (http://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, February 10, 1997 (http://gdcinfo.agg.nrcan.gc.ca/app/agegrid_e.html).
Reusch D.N. and Yates M. Data report: Compositions of garnet sand grains from Elan Bank, Kerguelen Plateau (ODP Site 1137) in Proceeding of Ocean Drilling Program, Scientific Results (Frey F.A., Coffin M.F., Wallace P.J., Quilty P.G. (Eds.)): College Station, TX (Ocean Drilling Program), 2003, vol. 183, pp. 1 – 8, doi:10.2973/odp.proc.sr.183.2003
Rotstein Y., Munschy M., and Bernard A. The Kerguelen Province revisited: Additional constraints on the early development of the Southeast Indian Ocean, Marine Geophysical Researches, 2001, vol. 22, no. 2, pp. 81–100.
Sandwell D. T. and Smith W.H.F. Retracking ERS-1 Altimeter Waveforms for Optimal Gravity Field Recovery, Geophysical Journal International, 2005, no. 163, pp. 79–89. doi: 10.1111/j.1365-246X.2005.02724.x (http://www.ngdc.noaa.gov/, http://topex.ucsd.edu/)
Schlich R. The Indian Ocean: aseismic ridges, spreading centers and ocean basins in The Ocean Basins and Margins. Nairn A.E.M et al. (eds.), Plenum Press, New York, 1982, pp. 51–147.
Smith W.H.F. and Sandwell D.T. Global Seafloor Topography from Satellite Altimetry and Ship Depth Soundings, Science, 1997, vol. 277 (5334) (http://topex.ucsd.edu/, http://www.ngdc.noaa.gov/).