Road Log from Kingman, Arizona, to Bagdad, Arizona: 97.2 miles
Published:January 01, 1987
0.0 Exit to eastbound Interstate Highway 40 toward Flagstaff from Andy Devine Avenue in Kingman.
0.1 Behind and to the left in the foothills of the Cerbat Mountains is the Kingman Feldspar mine, a 1700 Ma zoned pegmatite (Heinrich, 1960; Wasserburg and Lanphere, 1965) that intrudes Early Proterozoic granitic rocks. Minerals of principal economic interest are microcline and allanite.
0.9 Prominent strata at the top of the Grand Wash Cliffs (fig. 26) in the far distance at 9:00 are Cambrian through Mississippian limestone and associated sedimentary rocks. Rocks beneath the Paleozoic section are mainly Early Proterozoic foliated to gneissic granite to granodiorite. Most of the Proterozoic rocks of the Grand Wash Cliffs are unmapped; only the Garnet Mountain area (Blacet, 1975; Theodore and others, 1982) has been mapped in any detail.
2.6 To the left and north is Hualapai Valley, which drains to the north into the playa of Red Lake at the northern end of the Cerbat Mountains. One of the thickest accumulations of halite in Arizona (minimum of 4,000 ft; possibly as thick as 10,000 ft) underlies Red Lake and the Hualapai Valley south of Red Lake (Peirce, 1973; 1976).
3.8 Crossing Rattlesnake Wash. Hills to our right are composed of mildly flow foliated, 1400 Ma coarse-grained porphyritic granite of Rattlesnake Hill 1400 (Kesler, 1976).
5.1 Outcrops on the right that weather into large bouldery piles are the granite of Rattlesnake Hill (fig. 24).
6.2 Exit 59, DW Ranch Road, provides access into the northern Hualapai Mountains. Roadcuts
Figures & Tables
Proterozoic Ore Deposits of the Southwestern U.S.
This field conference of the Society of Economic Geologists, held in conjunction with the 1987 Annual Meeting of the Geological Society of America in Phoenix, Arizona, investigates various Proterozoic ore deposits in southeastern California and western and central Arizona. The trip starts in Las Vegas, Nevada, and ends in Phoenix, Arizona. Although Proterozoic ore deposits and geology are emphasized, the field trip traverses a variety of tectonic provinces, each containing ore deposits of various ages. Many geologic features and ore deposits that are not Proterozoic in age will be discussed during the course of the trip, but no stops will be made to investigate any of these, features.
The morning part of the trip starts in the Mesozoic foreland fold and thrust belt of Nevada and southeastern California, goes just east of the Mesozoic batholith belt of California, and ends in crystalline basement containing Early and Middle Proterozoic metamorphic and plutonic rocks. Within this basement is exposed the Middle Proterozoic Mountain Pass Carbonatite deposit, the largest source of rare-earth elements in the world. The Mountain Pass Carbonatite will be the focus of our morning stops.
The afternoon part of the trip crosses Early Proterozoic high-grade metamorphic rocks and plutonic rocks east of Mountain Pass. Ore deposits noted along the afternoon portion of the trip include middle Tertiary epithermal, gold-rich veins at Searchlight, Nevada, and disseminated gold deposits in Tertiary volcanic rocks near Hart Peak in the New York Mountains. The trip continues across the Colorado River trough along the border of California and Arizona, where crystalline basement and its cover of Tertiary volcanic rocks and plutons have been greatly extended along listric normal faults and low-angle detachment faults. The afternoon part of the trip ends in Oatman, Arizona, a district famous for its middle Tertiary epithermal, gold-rich deposits. The ore deposits at Oatman will be the subject of a slide show and talk after supper on the first night of the trip.
The first day ends with an evening drive across a middle Tertiary volcanic pile near Oatman. The first night will be spent in Kingman, Arizona.
Assemble at the Las Vegas Convention Center, south of the Hilton Hotel. Take any main street south to Tropicana Avenue. Turn west on Tropicana, past the Las Vegas Strip, and continue to Interstate Highway 15. Turn south on Interstate 15 toward Mountain Pass, California. Mileage starts at 0.0.