Analysis of magnetic field of the frontal area of the central part of the Kurile Island Arc
Category: 15-3
UDC 550.838.3
Y.V. Brusilovsky(1), B.V. Baranov(1), P.S. Babayants(2)
(1) Shirshov Institute of Oceanology, Moscow, Russia
(2) Aerogeophysica Inc., Moscow, Russia
Abstract. An area of negative polarity was distinguished and contoured on the base of magnetic field analysis. This area is confined to subsided part of the Vityaz Ridge and corresponds to an area of the crust extension and destruction. Inverse problem solutions lead to the conclusion that extension and destruction of the crust were accompanied with intrusion of magmatic rocks mostly during the age of inverse polarity. Presence of local positive magnetization anomalies in this area may be explained by superimposed volcanic activity associated with subsequent stage of magmatism related to the positive polarity period.
Based on magnetic field structure and bedrock dating we suggest that the extension zone in the fore-arc area was formed in the Late Oligocene, which approximately corresponds to the beginning of the Kurile Basin opening and volcanic arc formation.
Keywords: magnetic field, magnetic polarity, inverse problem, the zone of destruction, Kuril Island volcanic Arc.
References
Babayants P.S., Bloch Yu.P., and Trusov A.A., Possible structural-material mapping according to gravity and magnetic survey in the software package Sigma-3D, Geofizicheskii vestnik (Geophysical Bulletin), 2004, no 3, pp. 11-15.
Brusilovsky Yu.V., Ivanenko A.N., Zhukovin A.Yu., and Tsovbun N.M., Geomagnetic study the central part of the Kuril-Kamchatka island arc in the 52 cruise of "Academician MA Lavrentiev ", Russian Journal of Pacific Geology, 2012, vol. 31, no 6, pp. 114-120.
Cooper G.R.J., Forward modelling of magnetic data, Compute Geosci-Computers & Geosci. 1997, vol. 23, no. 10, pp. 1125–1129.
Fedotov S.A. and Chernyshev S.D., Long-term Earthquake Prediction for the Kuril-Kamchatka Arc: Reliability in 1986–2000, the Development of the Method, and a Forecast for 2001–2005, Vulkanol. Seismol., 2002, no. 6, pp. 3–24.
Harland W.B., Cox A.V., Llewellyn P.G., Picton C.A.G., Smith A.G., and Walters R.W., A geologic time scale, Cambridge: Cambridge University Press, 1982.
Hayashi T., The Study of Thermal Structure and Tectonic History of the Derugin Basin, Sea of Okhotsk, Master’s Thesis, Earthquake Research Institute, University of Tokyo, 1997.
Ivanenko A.N., Filin A.M., Gorshkov A.G., and Shishkina N.A., New data about the structure of the anomalous magnetic field in the central part of the Kuril-Kamchatka island arc, Oceanology, 2008, vol. 48, no. 4, pp.554-568.
Ivanenko A.N., Brusilovsky Yu.V., Filin A.M., and Shishkina A.M., Modern technologies of processing and interpretation of magnetic data when working on offshore oil and gas, Geophysics, 2012, no. 3, pp. 60-70.
Kimura G., Oblique subduction and collision: Fore arc tectonics of the Kurile, Arc. Geology, 1986, vol. 14, pp.404–406.
Kimura G. and Tamaki K. Collision, rotation, and back-arc spreading in the region of the Okhotsk and Japan Seas, Tectonics, 1986, vol.5, pp. 389–401.
Kharakhinov V.V., Tectonics and history of the development of sedimentary basins, Struktura i dinamika litosfery i astenosfery Okhotskogo regiona (Structure and dynamics of lytosphere and astenosphere of the Okhotsk region), Moscow:RAN, 1996, pp. 256-305.
Kulinich R.G., Karp B.Yu., Baranov B.V., Lelikov E.P., Karnaukh V.N., Valitov M.G., Nikolaev S.M., Kolpashchnikova T.N., and Tsoi I.B., Structural and geological characteristics of a “seismic gap” in the central part of the Kurile Island Arc, Russian Journal of Pacific Geology, 2007, vol. 1, no. 1, pp. 3-14.
Laverov N.P., Lappo S.S., Lobkovsky L.I., Baranov B.V., Kulinich R.G., and Karp B.Ya., The Central Kuril ‘Gap’: Structure and Seismic Potential, Doklady Earth Sciences, 2006, vol. 409, no. 5, pp. 787-790.
Lelikov E.P. and Emelyanova T.A., Geology and volcanism of the underwater Vityaz Ridge (Pacific slope of the Kuril Island Arc), Oceanology, 2011, vol. 51, no.2, pp.316-328.
Lelikov E.P., Emelyanova T.A., and Baranov B.V., Magmatism of the Submarine Vityaz Ridge (Pacific Slope of the Kuril Island Arc), Oceanology, 2008, vol. 48, no. 2, pp. 239–249.
Sergeev K.F., Tektonika Kuril’skoi ostrovnoi sistemy (Tectonics of the Kuril Island Arc), Moscow: Nauka, 1976.
Smith W.H.F., Sandwell D.T. Global sea floor topography from satellite altimetry and ship depth sounding, Science, 1977, vol. 277, pp.1956–1962.
Vasil’ev B. I. and. Suvorov A. A, New Data ott Geology of Far Eastern Seas, in Geological Structure of the Region of the Bussol’ Underwater Valley (Kuril Island Arc), DVNTS Akad. Nauk SSSR, Vladivostok, 1979, pp. 58–68 [in Russian].