| Reference Type | Journal (article/letter/editorial) |
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| Title | Orogenesis, high-T thermal events, and gold vein formation within metamorphic rocks of the Alaskan Cordillera |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Goldfarb, R. J. | Author |
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| Snee, L. W. | Author |
| Pickthorn, W. J. | Author |
| Year | 1993 (September) | Volume | 57 |
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| Issue | 388 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_57/57-388-375.pdf+ |
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| DOI | doi:10.1180/minmag.1993.057.388.03Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1935 | Long-form Identifier | mindat:1:5:1935:8 |
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| GUID | 0 |
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| Full Reference | Goldfarb, R. J., Snee, L. W., Pickthorn, W. J. (1993) Orogenesis, high-T thermal events, and gold vein formation within metamorphic rocks of the Alaskan Cordillera. Mineralogical Magazine, 57 (388) 375-394 doi:10.1180/minmag.1993.057.388.03 |
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| Plain Text | Goldfarb, R. J., Snee, L. W., Pickthorn, W. J. (1993) Orogenesis, high-T thermal events, and gold vein formation within metamorphic rocks of the Alaskan Cordillera. Mineralogical Magazine, 57 (388) 375-394 doi:10.1180/minmag.1993.057.388.03 |
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| In | (1993, September) Mineralogical Magazine Vol. 57 (388) Mineralogical Society |
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| Abstract/Notes | AbstractMesothermal, 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. Oreforming 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 δ18O values of 7‰- 12‰ and δD 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. Within interior and northern Alaska, latest Paleozoic through Early Cretaceous contractional deformation was characterised by obduction of oceanic crust, low-T/high-P metamorphism, and a lack of gold vein formation. Mid-Cretaceous veining occurred some 50-100 m.y. later, during a subsequent high-T metamorphic/magmatic event, possibly related to extension and uplift. In southern Alaska, gold deposits formed during latter stages of Tertiary, subduction-related, collisional orogenesis and were often temporally coeval with calc-alkaline magmatism. |
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