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- W293313112 abstract "Early magmatic sulfides have been identified in nearly all recent ash flow eruptions and in many prehistoric eruptions as well. However, they rarely have been documented in fresh volcanic rocks associated with porphyry or hydrothermal deposits. Large (up to 500 [mu]m), abundant (up to 0.1%) magmatic sulfides occur in some latite lava vitrophyres and vitric dikes from the Bingham district and the East Tintic Mountains, Utah. Individual sulfide blebs exhibit a significant amount of exsolved Cu-Fe sulfide. Compositional relations in the East Tintic lavas indicate that sulfide saturation may have occurred in response to injection of S- and Cu-rich (80 ppm) shoshonitic magma; however, a melanephelinite flow contains the highest Cu (125 ppm) of any of the fresh lava flows from the Great Basin that the authors have analyzed (289 samples). The S- and Cu-rich mafic alkaline magmas in both districts may have originated from partial melting of metasomatized lithospheric mantle. Sulfide saturation may not have occurred until the mafic (oxidized) magmas mixed with more silicic magmas or fractionated at mid- to upper-crustal levels. Not all of the comagmatic latite flows in the East Tintic Mountains have large, abundant magmatic sulfides. Some fresh flow vitrophyres have 1,000 times more sulfidesmore » (0.1% vs. [approximately]0.0001%) than other flows of approximately the same bulk composition. This appears to be a real magmatic variation rather than an artifact of variable sulfide preservation after eruption. A barren intrusion in the East Tintic volcanic field may be the same age as sulfide-poor flows.« less" @default.
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- W293313112 date "1993-04-01" @default.
- W293313112 modified "2023-09-27" @default.
- W293313112 title "The role of mafic alkaline magmas and magmatic sulfides in ore genesis: Examples from the Bingham district and the East Tintic Mountains, Utah" @default.
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