Open AccessDEEP STRUCTURE OF OSBORN PLATO (INDIAN OCEAN) ACCORDING TO MAGNETIC AND GRAVITY MODELING
Author(s) -
A. M. Gorodnitskiy,
А. Н. Иваненко,
О. В. Левченко,
I. А. Veklich,
Н. А. Шишкина
Publication year - 2020
Publication title -
okeanologičeskie issledovaniâ
Language(s) - English
Resource type - Journals
eISSN - 2587-9634
pISSN - 1564-2291
DOI - 10.29006/1564-2291.jor-2020.48(2).5
Subject(s) - geology , magnetic anomaly , lithosphere , plateau (mathematics) , bouguer anomaly , geophysics , volcano , crust , gravity anomaly , tectonics , seismology , paleontology , mathematical analysis , mathematics , oil field
According to the data of hydro-magnetic surveying and satellite altimetry, using the original technology for solving the inverse problem, 2D models of the magnetic layer for three latitudinal profiles crossing the submarine plateau of Osborne in the southern, central and northern parts were constructed. Density modeling for these three profiles was carried out using the available worldwide data on free air anomalies, reduced to the Bouguer anomaly. On all profiles, zones of increased effective magnetization with complex morphology are confidently distinguished. The distinguished sources of magnetic anomalies are tending toward two deep horizons. The upper one corresponds to layer 2 of the classical model of the magnetic layer of the oceanic lithosphere and is a source of local magnetic anomalies of both signs. The lower magnetic layer, the bottommost part of which approximately corresponds to the depth of the Moho surface according to density modeling, is apparently composed of serpentinites. The crust is broken by a system of sub-meridional faults, to which confined deep magnetic bodies, possibly associated with serpentinite protrusions. The revealed laterally inhomogeneous deep structure of the magnetic layer of the Osborne plateau and the adjacent NER segment testifies to their complex multi-stage volcano-tectonic evolution, which continues to present day.