The Arctic Alaska-Chukotka terrane (AAC) is a microcontinent that today encompasses the North Slope, Brooks Range, and Seward Peninsula of northern Alaska; the Chukotka Peninsula, New Siberia Islands, and Wrangel Island in eastern Siberia; and the continental shelves of the Bering, Beaufort, and Chukchi seas.
[1] Comparable in size to Greenland, the AAC is the largest of the Neoproterozoic–early Paleozoic continental fragments now dispersed around the Arctic Ocean; some of which possibly formed the continent Arctida.
The AAC has a complex geological history that includes the Grenville, Timanian, Caledonian–Appalachian, and Ellesmerian orogenies.
[3] The age of the basement of the AAC remains enigmatic, hence also details about the microcontinent's ancient, tectonic history.
The microcontinent was obviously involved in a series of magmatic events, beginning at c. 1.6–1.4 Ga, and ending in the Avalonia–Cadomian orogeny.