Collapse feature 241, Mohawk Canyon, Coconino County, Arizona, USAi

Regional Level Types
Collapse feature 241	Pipe
Mohawk Canyon	Canyon
Coconino County	County
Arizona	State
USA	Country

A collapse structure located in sec. 7, T32N, R6W, G&SRM, 26.2 km (16.3 miles) WSW of Supai (village), along the E canyon wall of Mohawk Canyon.

Two tall pinnacles of breccia are surrounded at their base by breccia with more rounded clasts, down-dropped in an amphitheater. Goethite nodules with malachite rims occur in the breccia.

This breccia pipe is the most interesting of the Mohawk Canyon area collapse features exposed below the Kaibab Limestone surface, in part because of the two silicified pinnacles, and in part, because surface samples are mineralized. This is the only pipe in the Mohawk Canyon area with silicified spires similar to the Blue Mountain pipe (pipe 287 in Billingsley and others, 1986; Van Gosen and others, 1989) and pipe 237
(Wenrich and others, 1986), located to the south and west on the Hualapai Indian Reservation and previously drilled by Western Nuclear in the 1970's. Except for the Orphan mine, none of the other U-producing breccia pipes have had exposures of silicified breccia. Such exposures subject the pipes to oxidation and removal of much of the ore body. The brecciated column of pipe 241 abuts against unreformed sandstone. The breccia itself has a conglomeratic appearance of rounded cobbles in a well-cemented matrix.

Other Regions, Features and Areas containing this locality

References