DEEP STRUCTURE OF OSBORN PLATO (INDIAN OCEAN) ACCORDING TO MAGNETIC AND GRAVITY MODELING
| Autor: | N.A. Shishkina, I. A. Veklich, A.M. Gorodnitskiy, O. V. Levchenko, A.N. Ivanenko |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
geography
Plateau geography.geographical_feature_category 010504 meteorology & atmospheric sciences Submarine Crust Geophysics Present day 010502 geochemistry & geophysics 01 natural sciences Magnetization Lithosphere Magnetic anomaly Bouguer anomaly Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Oceanological Research. 48:69-90 |
| ISSN: | 2587-9634 1564-2291 |
| DOI: | 10.29006/1564-2291.jor-2020.48(2).5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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