Textural and stable isotope studies of the Big Mike cupriferous volcanogenic massive sulfide deposit, Pershing County, Nevada
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Abstract
The massive ore contains two major generations of pyrite, a fine and a coarse grained, both of which show a striking variety of textures involving quartz. Framboidal pyrite in the argillite host rock has delta 34 S values of approximately -24 per mil indicating the presence of a euxinic environment. The delta 34 S values of fine-grained pyrite in the massive ore range from degrees 6.4 to + or -2.0 per mil; those of coarse-grained pyrite range from -3.5 to + or -5.5 per mil. A significant portion of the isotopically light sulfur for the early, fine-grained hydrothermal pyrite in the massive lens was probably derived from framboidal biogenic pyrite in interflow sediments of the underlying greenstone pillow lavas. Microcrystalline quartz in massive ore, hanging-wall jasper, footwall hydrothermal chert and coarse quartz from hanging-wall and footwall stringer zones have delta 18 O values between 15.6 and 19.6 per mil; one sample of vein hematite has a value of 4.4 per mil. The combined sulfur and oxygen isotope and textural data indicate that much of the material in the massive lens originally precipitated as fine-grained pyrite or as a precursor iron sulfide along with some silica from a hydrothermal plume similar to those recently observed at the East Pacific Rise spreading center at lat 21 degrees N. The primary material underwent recrystallization, mineralization, and late-stage quartz deposition in the presence of later fluids which had distinctly different sulfur isotope compositions.
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Textural and stable isotope studies of the Big Mike cupriferous volcanogenic massive sulfide deposit, Pershing County, Nevada |
Series title | Economic Geology |
DOI | 10.2113/gsecongeo.79.1.124 |
Volume | 79 |
Issue | 1 |
Year Published | 1984 |
Language | English |
Publisher | Society of Economic Geologists |
Description | 17 p. |
First page | 124 |
Last page | 140 |
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