POTENTIAL APPLICATIONS OF MAGNETIC GRADIENTS TO MARINE GEOPHYSICS.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF GEOLOGY AND GEOPHYSICS
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Chapter I is a consideration of the application of magnetic gradients to marine geophysics and it shows that gradients are well-suited to the investigation of sea floor structure. Gradients may be utilized in the following areas of study investigation of magnetic anomaly fine structure delineation of geologic contact position and orientation estimation of depth to source and source type and determination of magnetization direction from topographic effects. This chapter also discusses the requirements for a marine magnetic gradiometer and proposes a system utilizing two Zeeman effect sensors in a stable vertical towed array. It also includes investigation of error sources and means for their correction or reduction. Chapter II reviews present knowledge and theory of ocean ridge structure, with emphasis on the characteristic magnetic anomalies observed over the ridges. We propose that these anomalies arise from a sub-horizontal layered structure composed of basaltic flows which have originated in the ridges axial region. Included in this presentation is a sub-horizontal layered model of the Reykjanes Ridge. Computed magnetic anomaly profiles over this model correlate well with observed profiles taken from a survey by Heirtzler.
- Geology, Geochemistry and Mineralogy