Abstract
New aeromagnetics show a complex of magnetic patterns and source depths of the north and central Argentine continental and adjacent oceanic crust. The 40 km wide, positive magnetic G-anomaly reflects an end-rift associated volcanic edifice at the continental margin. M4-MO and Cretaceous quiet zone oceanic crust are identified. The Colorado magnetic discontinuity forms the southern boundary of the Precambrian La Plata craton. To the south the continental crust of the Patagonia Platform is composed of amalgamated late Precambrian through end-Paleozoic weakly magnetic sedimentary prisms. The SW Patagonia Platform crust shows a strong high-frequency magnetic pattern associated with Mesozoic volcanics, while zones of mid-crustal level intrusives and some volcanics on the outer shelf are expressed as a broad, higher amplitude magnetic pattern.
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