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The only lodes known in the Aleutian Islands region are gold deposits (some of which may have been productive) and occurrences of metallic sulfide minerals on Unalaska and neighboring Amaknak and Sedanka Islands (Berg and Cobb, 1967, P. 7â8, fig. 2).
Subduction of the Pacific Plate beneath the North American Plate creating the Aleutian trench and volcanic island arc (Credit: Alaska Volcano Observatory). Click image for a larger view. Subduction zone volcanoes commonly exhibit a symmetric shape with steeper slopes near the vent and a broad gentle base. subduction zone, composed of the deep Aleutian Trench coupled with a landward line of volcanoes, creates a series of offshore islands (the Aleutians) as well as a line of volcanoes along the edge of the continent (the Aleutian Range on the Alaska Peninsula).