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Abstract
High-temperature quartz veins were identified in drill core at ~600 m below the Sunnyside epithermal base and pre-cious metal deposit in southwestern Colorado. The veins consist of early anhedral quartz that shows a bluish ca-thodoluminescence emission and hosts heterogenous silicate melt inclusions. The early quartz is overgrown by a later generation of quartz that exhibits euhedral termina-tions with oscillatory growth zones showing a bright pink to purple cathodoluminescence emission. Both types of quartz are crosscut by ubiquitous planes of vapor-rich inclusions and some hypersaline liquid inclusions. In addi-tion, secondary planes of intermediate-density inclusions occur. The petrographic characteristics of the two quartz types are similar to those in ‘A’ and ‘B’ veins encountered in shallow- and intermediate-depth porphyry deposits. The relationships at Sunnyside imply that these high-temperature veins formed from magmatic-hydrothermal fluids derived from an intrusion located not far below the lowest level of drilling. Sunnyside appears to be a rare example of an epithermal deposit that is directly connected to a high-level porphyritic intrusion.
Study Area
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Evidence for a high-level porphyritic intrusion below the Sunnyside epithermal vein deposit, Colorado |
| Volume | 1 |
| Year Published | 2023 |
| Language | English |
| Publisher | Society for Geology Applied to Mineral Deposits |
| Contributing office(s) | Geology, Geophysics, and Geochemistry Science Center |
| Description | 4 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proceedings of the 17th SGA biennial meeting |
| First page | 56 |
| Last page | 59 |
| Conference Title | 17th Biennial SGA Meeting |
| Conference Location | Zurich, Switzerland |
| Conference Date | August 28 - September 1, 2023 |
| Country | United States |
| State | Colorado, New Mexico |
| Google Analytic Metrics | Metrics page |