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Victoria University Antarctic Research Expedition Science and Logistics Reports 2001-02: VUWAE 46

McMurdo Ice Shelf Aeromagnetism

McMurdo Ice Shelf Aeromagnetism

Figure 9 illustrates the corrected and partly levelled magnetic anomaly map acquired during the January aeromagnetic survey. The map is annotated to indicate initial interpretations. Strong red colours indicate strong positive magnetic anomalies, and strong blue colours indicate strong negative magnetic anomalies. The high frequency anomaly patters Brown Peninsula, Mount Discovery, Black Island, White Island and Hut Point Peninsula indicate strongly magnetised normal and reversed volcanic flows at or near the surface. Reduced intensities and slightly extended wavelengths north of White Island indicate similar flows but progressively deeper below the ice shelf. The magnetic anomaly profiles indicate that the Black Island volcanic massif is centred 10km further SW than the current topographic expression of Black Island. The northern peninsula of Black Island is clearly indicated as a separate but smaller volcanic massif that may extend beneath the ice shelf to the North. Large magnetic anomalies beneath the ice shelf to the north of Minna Bluff and between Black Island and Hut Point Peninsula indicate deep but strongly magnetic igneous or volcanic provinces. Between Brown Peninsula and Black Island a strong positive magnetic anomaly indicates a substantial volume of volcanic sediments close to the surface of the ice shelf.