Aeromagnetic search for Cenozoic magmatism over the Admiralty Mountains Block (East Antarctica)

Cenozoic magmatic rocks of the Transantarctic Mountains provide an important window on the tectonic and
magmatic processes of the West Antarctic Rift System. Previous aeromagnetic investigations in northern Victoria Land
have delineated Cenozoic volcanic and intrusive complexes assigned to the McMurdo Volcanic Group and Meander
Intrusives over the Transantarctic Mountains. We present a new aeromagnetic anomaly map for the region north of the
Mariner Glacier to study the extent and spatial distribution of these Cenozoic rocks over the previously unexplored
Admiralty Mountains. The new map shows that the Meander Intrusives are restricted to the coastal region between the
Malta Plateau and the Daniell Peninsula. However, the McMurdo Volcanic Group rocks extend further inland, and may
delineate a hitherto unrecognised volcano-tectonic rift zone, extending as far north as the Trafalgar Glacier.