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• W1799087977 abstract "The Alta stock of granodiorite is closely associated in space andtime with many of the Pb, Zn and Ag ore deposits of the Park City-Cottonwoodmining area in the central Wasatch Mountains, Utah. The purpose ofthis study was to determine if fractional crystallization of the Alta magmaultimately resulted in a metal-rich ore-forming fluid.The Alta magma was intruded in two pulses into pre-Triassicsedimentary rocks at a depth of approximately 21,000 feet and at a temperaturein excess of 720°C. Detailed study of texture indicates that the firstphase of magma solidified with a nonporphyritic texture, crystallizingfrom the wall progressively toward the center of the stock. The rock atthe wall is rich in mafic minerals but grades inward within a few hundredfeet to light-gray medium-grained biotite-hornblende granodiorite. Earlyin the history of the first pulse of magma, convection currents carryinggrowing crystals of early minerals formed stratified gravity accumulationsrich in hornblende, biotite, sphene, magnetite and apatite. These layeredmasses were subsequently broken and displaced. They now form tabularinclusions of mafic layered granodiorite in the light-gray nonporphyriticgranodiorite.At a late stage in the crystallization history, the Alta stock had anessentially solid shell of nonporphyritic granodiorite at least 1200 feetthick that surrounded a partially liquid but semirigid crystal mush at thecenter of the stock. Structural adjustments at this late stage re sulted inclose-space jointing and emplacement of aplite-pegmatite dikes in the nonporphyriticgranodiorite shell. After emplacement of the dikes but beforethe interstitial liquid of the magma at the center of the stock had completelycrystallized, the semi-rigid crystal mush and solid shell were intruded bya second pulse of the magma. The distribution of strongly porphyritictexture indicates that loss of volatiles through fractures in the overlyingmaterial caused this later phase of the magma to finish crystallization witha fine-grained groundmass. Modal analyses supported by gravimetricchemical analyses show that the porphyritic granodiorite has a slightlymore silicic composition than the nonporphyritic granodiorite.The Flagstaff-Emma ore zone in the Little Cottonwood district ison the trend of a westward dike like projection of the porphyritic granodiorite.The fluids that were released during the emplacement of this latephase of the magma conceivably may have been the same fluids that depositedthe ore minerals in the Flagstaff-Emma ore zone.In order to determine the trend of the ore-metals during crystallizationof the Alta magma, 76 mineral separates of orthoclase, plagioclase,biotite, hornblende, magnetite, sphene, quartz and chlorite were analyzedby the emission spectrographic method for Cu, Pb, Zn, Ag, Co, Ni andSn. Comparison between samples of the same mineral show that Co andNi are slightly less abundant and Cu, Pb and Sn are more abundant in thelater phases of the Alta igneous suite. No trend is apparent for Ag andZn. Cu, Co, Ni, Ag and Zn were added to the solid phases of the rockduring chloritic alteration.The release of volatiles associated with the late-stage intrusion ofporphyritic granodiorite, the structural relation of the adjacent ore depositsto this porphyritic granodiorite and the trend in trace-elementabundances suggest that an ore-forming fluid may have been produced at alate stage in the crystallization of the Alta stock." @default.
• W1799087977 created "2016-06-24" @default.
• W1799087977 creator A5082061125 @default.
• W1799087977 date "1961-01-01" @default.
• W1799087977 modified "2023-09-27" @default.
• W1799087977 title "Geology of the Alta stock, Utah" @default.
• W1799087977 doi "https://doi.org/10.7907/8775-nj40." @default.
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