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Abstract

The morning part of the trip starts in Kingman, near the western edge of the Colorado Plateau, and traverses the Transition Zone of Arizona. Proterozoic rocks are abundant along this section of the trip and consist mainly of foliated to undeformed Early Proterozoic granite to granodiorite (~ 1700 Ma) cut by undeformed Middle Proterozoic leucocratic and potassic granite (~1400 Ma). Relatively small belts of Early Proterozoic meta-sedimentary and metavolcanic rocks are preserved within the terrane dominated by Proterozoic intrusive rocks. Much of the Early Proterozoic geologic history in this part of Arizona is unknown.

Ore deposits characteristic of this part of the Proterozoic are: 1) 1700 Ma volcanogenic massive sulfide deposits in metasedimentary and metavolcanic rocks (Hualapai metallic mineral district, northern Hualapai Mountains); 2) 1700 Ma gold-rich quartz veins related to Early Proterozoic granodiorite and diorite (Cottonwood district in the Cottonwood Cliffs); 3) 1700 Ma pegmatite deposits related to evolved granites (Aquarius Mountains district in the Aquarius Mountains and the Kingman Feldspar mine north of Kingman); and 4) 1400 Ma tungsten-rich quartz veins related to potassic granites (Ophir, Fluorescent, and Three-In-One districts in the Hualapai Mountains.

Phanerozoic deposits include base-metal-rich veins and copper-rich disseminated and stockwork systems related to Laramide intrusives in the central Cerbat Mountains and Hualapai Mountains, and middle Tertiary vein systems on the west side of the Hualapai Mountains.

Our arrival in Bagdad in the late morning will bring us to the first major 1700 Ma volcanogenic massive sulfide ore deposits in Arizona, those in the Old

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