Abstract:

At the Admiralty Bay of King George Island, Keller Peninsula, Ullman Spur and Point Hennequin are the main areas of Tertiary volcanic rocks distributed. Field investigation and K-Ar age datings indicate that, in Keller Peninsula, occurred three volcanic eruptions, which accompanies with N-towards continuous migration of volcanic center. After the second eruption, the crater collapsed, and a caldera was formed. Afterwards, the eruptions limited at the northern end of the peninsula, and then migrated to Ullman Spur. Therefore Keller Peninsula is a revived caldera, and its volcanic activities are characteristic of migration of volcanic center with time. Point Hennequin volcanism happened largely simultaneous with the above two areas, but it has not direct evolution relation to the other areas. Thus Point Hennequin has another independent volcanic center.