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Identification of subduction zones and passive margins by regional magnetic anomaly maps



Identification of subduction zones and passive margins by regional magnetic anomaly maps



SEG Abstracts 1982(1): 268-269



There are at least five areas where magnetic anomaly contour maps now exist over passive margins and at least four areas where these maps exist over subduction zones. At passive margins the magnetic transition zone must be reconciled with modern theories of the initial breakup of continents. At subduction zones extinction of oceanic anomalies is apparently due to the subduction of the oceanic crust and the increase of its temperature beyond the blocking or Curie temperatures. It has long been recognized that there is a difference in the character of magnetic anomalies over land and sea. It was thought at first that magnetic profiles showed shorter wavelength anomalies over continental areas simply because the depth to source was greater over the ocean than the continent.

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