Magnetic anomalies and deep structure of West Antarctic volcanic submarine structures
- magnetic anomalies,
- West Antarctica,
- submarine volcanics
The geophysical heterogeneities distribution was analyzed for detailed crustal study of the Pacific margin of the Antarctic Peninsula and Bransfield Strait volcanic structures. The modeling of volcanic structure's magnetic anomalies has been realized. The modeling of local magnetic anomalies above volcanic structures shows that their sources are at a depth of 4–8 км. Local but not regional character of the magnetic anomalies is explained by the features of the thermodynamics and crystallization regime and possibly, by absence of the considerable secondary changes of magnetic sources at deeper horizons. It is observed that location of submarine volcanic structures of Bransfield Strait is fixed by high gradient zone of geoelectrical anomaly values and substantial Moho reduction. These data confirm the possible existence of favorable conditions for intermediate zones with deep crustal material and crystallization processes in the middle crust.