...Gary Zito; Sarah L. Hanson Abstract A miarolitic cavity in a pegmatite in Cheyenne Canyon, El Paso Co., Colorado has an unusual mineral assemblage that includes epitaxial genthelvite overgrowths on danalite cores. The cavity was lined with white microcline crystals with clear epitaxial albite...

... contributions 8 , 57 – 67 . Zito, G. & Hanson, S.L. (2017) Genthelvite overgrowths on danalite cores from a pegmatite miarolitic cavity in Cheyenne Canyon, El Paso Co., Colorado . Canadian...

... Proterozoic Moho. We speculate that imbrication of the Proterozoic lower crust was contemporaneous with the 1.76 Ga uplift and deformation of the 50 km-wide Palmer Canyon block immediately north of the Cheyenne belt exposed in the Laramie Mountains. Our P -wave receiver function dataset is constructed from...

.... Wright and Snoke (1993) call on a northern Archean and southern Proterozoic terrane beneath the Ruby Mountains–East Humboldt range along with mantle sources to explain this range in model ages. North of the traditional Cheyenne Belt in the Farmington Canyon complex, Hedge et al. (1983) reported...

... 1:100,000 map in southeastern Montana and the Canyon coal bed were selected to demonstrate this capability. The Birney quadrangle includes parts of Big Horn, Rosebud, and Powder River Counties. Other political entities are the Northern Cheyenne Indian Reservation and the Custer National Forest...

..., and Mojave provinces. Approximately 200 U-Pb analyses of zircons from Paleoproterozoic rocks in the Wasatch Mountains (Farmington Canyon and Little Willow complexes) and Uinta Mountains (Owiyukuts and Red Creek complexes) indicate: (1) U-Pb ages of 2.446 ± 0.011 Ga for igneous zircons from a meta-igneous...

...Figure 7 —Sequential structural cross sections across the Quealy wrench duplex and the projected Cheyenne belt within the Laramie basin showing 2-D geometry of Muddy and Owl Canyon contour horizons. Sections are located on Figure 6A ; fault symbols are identified in Figures 3 and 6 . ...

.... Cretaceous sands accounted for most of the new discoveries, with Eocene zones most important in Utah. Production in additional zones was established in several fields in the Denver-Cheyenne Basin. The Eocene Wasatch and Cretaceous Mesaverde produced for the first time in Utah and western Colorado. Interest...

... ) suggests that the Lytle at Canyon City is laterally continuous with Lytle (“Cheyenne” of Stovall and McLaughlin) in the Great Plains region of Colorado and the Oklahoma Panhandle. The brownish upper Lytle of the southern Front Range differs only slightly from the Lytle in the plains region, which is light...

... to reactivation of the zone. Movement on the Farwell Mountain backthrust is inferred to relate to Cheyenne belt suturing at 1.78–1.75 Ga. We correlate suturing in the Farwell Mountain–Lester Mountain suture zone to S 1 /D 1 (1.746–1.74 Ga) in the Soda Creek–Fish Creek shear zone. We attribute the complexity...

... and that no Cheyenne is present. In the Oswald well in Sec. 8, T. 12 S., R. 15 W., the beds assigned to the Comanchean extends from 372 to 560 feet, or about 200 feet. The same thickness is found in the Milke well in Sec. 20 of the same township and range, and in the Dodge well in Sec. 29, T. 11 S., R. 15 W...

...Plate I. Fig. 1. View west from Windy Saddle of Lookout Mountain showing Clear Creek Canyon and mature uplands north and south. Fig. 2. View south along foothills belt from north end of Red Rocks Park, west of Denver, Colorado. Precambrian of east base of Front Range at right (P); nearly flat...

...Figure 1. Sketch map of United States showing inferred distribution of Archean and Paleo-proterozoic crustal elements prior to ca. 1600 Ma. Mv—Mojave Province; Y—Yavapai Province; Mz—Mazatzal Province; CB—Cheyenne belt; NCP—Northern Central Plains orogen; SCP—Southern Central Plains orogen; GC...

... to the southern margin of the North American craton during the interval 1.8–1.70 Ga by convergent tectonism along the Cheyenne belt. A growing body of data suggests that these rocks were deposited, at least locally, on older rocks of earliest Proterozoic and Archean ages, probably correlative with the Trans...