Black Dome (Arizona)

Black Dome is a prominent volcanic feature located in the western Sonoran Desert of Arizona, within the Barry M. Goldwater Range. It is classified as a volcanic neck, also sometimes referred to as a volcanic plug. This type of landform is created when magma hardens within the vent of an active volcano. Over time, the surrounding, softer volcanic cone erodes away, leaving the more resistant solidified magma core exposed as a distinctive, steep-sided, and often dark-colored dome.

The Black Dome is composed primarily of dark-colored, fine-grained basaltic andesite. The dome rises significantly above the surrounding desert landscape, making it a noticeable landmark. Its dark coloration is due to the rock's mineral composition and surface weathering.

Access to Black Dome is restricted as it is situated within the Barry M. Goldwater Range, a military training area. Unauthorized entry is prohibited. Therefore, opportunities for hiking or close-up exploration are limited to authorized personnel and specific permitted activities.

The volcanic activity that formed Black Dome is part of the larger volcanic field prevalent in this region of Arizona, dating back millions of years. Understanding the geology of Black Dome provides insight into the volcanic history of the southwestern United States.