Spectral analysis of ocean bottom for geological prospecting (on the example of the rift zone of the Mid-Atlantic ridge)

I. S. Sergeev; I. V. Egorov; A. B. Glebova

doi:10.31857/S0435428120040094

Spectral analysis of ocean bottom for geological prospecting (on the example of the rift zone of the Mid-Atlantic ridge)

I. S. Sergeev, I. V. Egorov, A. B. Glebova

https://doi.org/10.31857/S0435428120040094

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Abstract

The article presents the results of applying spectral analysis (the method of two-dimensional Fourier transformation) for the study of the deep-water relief of the Mid-Atlantic Ridge (MAR). Due to the difficult research conditions in the World Ocean, a significant part of the work, primarily at the exploratory stage, is carried out using remote sensing techniques, including using a variety of prognostic maps based on morphometric characteristics of the bottom surface. The new method appying spectral analysis of the deep-sea relief to predict the localization of the sulphides using the Student’s t-test, was developed by authors. Using the bathymetric data of ten ore fields in the studied region, we identified the criteria for the spectral deformation components of the bottom surface as prospecting signs for sulphide deposits. As a result of the research, a number of perspective local areas connected to geologic structures, where hydrothermal ore formation is possible, were identified. A prognostic map has been created for prospecting deep-sea polymetallic sulphides in the southern part of the Russian exploration area.

Keywords

morphometric analysis of the relief, Fourier transformation, spectral analysis of the relief, Mid-Atlantic Ridge, rift zone, deep-water polymetallic sulphides

About the Authors

I. S. Sergeev

SPSU; VNIIOkeangeologia
Russian Federation

Institute of Earth Sciences

St. Petersburg

I. V. Egorov

VNIIOkeangeologia
Russian Federation
St. Petersburg

A. B. Glebova

SPSU
Russian Federation

Institute of Earth Sciences

St. Petersburg

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Review

For citations:

Sergeev I.S., Egorov I.V., Glebova A.B. Spectral analysis of ocean bottom for geological prospecting (on the example of the rift zone of the Mid-Atlantic ridge). Geomorfologiya. 2020;(4):34-44. (In Russ.) https://doi.org/10.31857/S0435428120040094