Devising methods for geomagnetic studies in the World Ocean |
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| Authors: | E V Verzhbitskii A A Shreider |
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| Institution: | (1) Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | The importance of geomagnetic studies in the World Ocean for deep structure research and fore-casting of mineral resources is noted. A combined method for development of a marine nuclear magnetometer is adduced. The physical background of operation of nuclear magnetometers is analyzed in order to optimize the measurements of the magnetic field. The results of the experiments on detecting nuclear precession signals against the background of ship noises are considered and the elaboration of an MM-1 nuclear magnetometer at the Shirshov Institute of Oceanology is described. A technique for magnetic survey and comprehensive geological interpretation of the anomalies and Z and H field components are presented. Examples of geomagnetic studies performed in the World Ocean with the MM-Inuclear magnetometer are assessed: for the first time in Russia, linear magnetic anomalies were identified and sea-floor spreading rates were calculated (the northern part of the Indian Ocean); a regional geomagnetic survey was carried out in the region of Iceland, which proved the spreading origin of the seafloor in this vast region. A systematic analysis of geomagnetic data obtained with the MM-1 magnetometer in the World Ocean provided the creation and development of the methodology for their tectonic and geodynamical interpretation. On the basis of the geomagnetic data obtained, new fundamental conclusions about the deep structure, kinematics and paleogeodynanics of the World Ocean floor were made. |
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