... by these events. Geologic records thus provide key data regarding rock avalanche size, timing, and dynamics. Here we present a detailed case history analysis of the Devils Castle rock avalanche located near the town of Alta in the Wasatch Mountains of Utah. The deposit is ∼1.5 km in length with a Fahrboeschung...

...Bronson Stringham; Max Erickson Abstract The occurrence of tillite in Utah is well known from the findings of Blackwelder, Hintze, Eardley and others, 1 and many localities have been noted and the tillite described. In the Cottonwood-American Fork region 14 miles southeast of Salt Lake City, near...

... provide complementary information on fluid distribution patterns and the extent of fluid infiltration. The Alta stock is one of 11 mid-Tertiary calcalkaline intrusions in Utah’s central Wasatch Mountains ( John 1991 ; Fig. 1 ). The stock is a granodiorite to quartz monzodiorite body...

... of fluid flow (if any). Review of seven case studies of contact-metamorphosed siliceous dolomitic limestones indicates that unless ϕ > l4%, fluid flow occurred in each instance. No universal statements, however, may be made about the geometry of flow. The outer portions of five aureoles (Alta, Utah...

.... Comparison of results with observations from the Alta (Utah) contact aureole indicates that both mineral reactions and isotopic alteration record fluid flow through highly heterogeneous permeability. We interpret this extreme heterogeneity to be the result of positive feedback between reaction enhancement...

... modeling approach is used instead, heterogeneous permeability maps can be constructed to approximate the statistical distributions of natural systems, and both overall isotopic trends and data scatter can be matched. Three models are presented for the Alta, Utah, contact aureole to show that the observed...

... skarn from Albion Basin, Alta, Utah, and by construction of a quantitative model based on the discussion of the Salton Sea geothermal system by Helgeson (1967). Copyright © 1977 by the Mineralogical Society of America 1977 ...

...BYRON J SHARP Abstract The area described is about 25 miles southeast of Salt Lake City and about 2 miles west of Alta, Utah. Eastward-dipping Precambrian quartzites and argillites have been intruded by a Tertiary pluton called the Little Cottonwood quartz monzonite. Another intrusive body...

... sponsored by the USGS—which in turn was the culmination of a series of meetings dating from a milestone workshop (referred to as “Alta II”) at Alta, Utah, in June 1991 at which representatives of regional seismic networks from throughout the U.S. agreed to form a national consortium. The Council currently...

...David A. John Abstract Nine mid-Tertiary calc-alkaline stocks, a subvolcanic porphyry system, and coeval volcanic rocks are exposed in a 45-km-long east-trending belt across the central Wasatch Mountains, Utah. The intrusions vary systematically from west to east in texture, style of emplacement...

.... Geological Survey and held at Alta, Utah, from July 29 to August 1, 1979. Organizers of the conference were E. R. Anderson of the U.S. Geological Survey, AlanRyall of the University of Nevada, and R. B. Smith of the University of Utah. The conference was aimed at a broad discussion of new results on seismic...

...- fornia. (Life member.) J. J. Beeson: Alta, Utah. J. H. Branscomb: Butte, Montana. W. S. DuVal: San Francisco, California. J. A. Gunn, Jr.: Kelseyville, California. Geo. V. Lawry: Salt Lake City, Utah. Thomas MeCaughern: San Francisco, California. Jas. N. McCune: Portland, Oregon. C. W. Mitchell: San...

...David Borrok; Stephen E. Kesler; Thomas A. Vogel Abstract We report here the results of a reconnaissance study of sulfide inclusions in some intrusive and volcanic rocks from the Bingham-Park City belt in central Utah. The study was undertaken to determine whether primary sulfides were preserved...

...R. J. KURYVIAL Abstract The partitioning of elements in alkali feldspars from the Clayton Peak, Alta, and Little Cottonwood stocks of the central Wasatch Range, Utah, suggests a common magmatic origin for the three intrusive bodies. With decrease in age of intrusion, the alkali feldspars show...

...-mail, [email protected] The Alta (also known as the Little Cottonwood-American Fork) and Park City mining districts in north-central Utah were active starting in the 1860s and productive until the 1950s ( Boutwell, 1912 ; Calkins and Butler, 1943 ). The area examined in detail is in Thaynes Canyon...

... of the Tertiary Alta pluton, central Wasatch Mountains, Utah [abs.] : Eos, American Geophysical Union , v. 74 , no. 43 , supplement, p. 578 . Coney , P. J. , and Reynolds , S. J. , 1977 , Cordilleran Benioff zones : Nature , v. 270 , p. 403 – 406 . Constenius , K. N. , 1996...