Orogenesis, high-T thermal events, and gold vein formation within metamorphic rocks of the Alaskan Cordillera
Mineralogical Magazine
By: R. J. Goldfarb, L. W. Snee, and W. J. Pickthorn
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Abstract
Mesothermal, gold-bearing quartz veins are widespread within allochthonous terranes of Alaska that are composed dominantly of greenschist-facies metasedimentary rocks. The most productive lode deposits are concentrated in south-central and southeastern Alaska; small and generally nonproductive gold-bearing veins occur upstream from major placer deposits in interior and northern Alaska. Ore-forming fluids in all areas are consistent with derivation from metamorphic devolatilisation reactions, and a close temporal relationship exists between high-T tectonic deformation, igneous activity, and gold mineralization. Ore fluids were of consistently low salinity, CO2-rich, and had ??18O values of 7 ???-12??? and ??D values between -15??? and -35???. Upper-crustal temperatures within the metamorphosed terranes reached at least 450-500??C before onset of significant gold-forming hydrothermal activity. In southern Alaska, gold deposits formed during latter stages of Tertiary, subduction-related, collisional orogenesis and were often temporally coeval with calc-alkaline magmatism. -from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Orogenesis, high-T thermal events, and gold vein formation within metamorphic rocks of the Alaskan Cordillera |
| Series title | Mineralogical Magazine |
| Volume | 57 |
| Issue | 3 |
| Year Published | 1993 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Mineralogical Magazine |
| First page | 375 |
| Last page | 394 |
| Google Analytic Metrics | Metrics page |