| Abstract: | Distribution of more than 300 gold-bearing samples from the Livengood (Tolovana) and parts of the Fairbanks and Rampart mining districts in central Alaska, USA, indicate that the concentration of gold in placers is spatially related both to structural features and to Late Cretaceous and (or) Tertiary felsic plutons. The regional consistency of these spatial relationships is demonstrated by proximity analysis using a Geographic Information System (GIS), and suggests a genetic association between faults, felsic plutons, and gold occurrences. The local presence of gold within several of the plutons indicates that these are the source of some of the gold. In addition, some gold occurs proximal to faults where plutons are not present, suggesting that some of the gold was also derived from the country rock. We envision a model whereby weakly mineralized solutions, thermally driven by latent plutonic heat, were enriched by circulation through clastic units that may have had a naturally elevated gold background. The resultant enriched solutions were channeled and reconcentrated along or adjacent to large-scale fault systems. Future exploration to define individual target areas should be directed toward areas where Late Cretaceous and (or) Tertiary felsic plutons occur near major faults. ?? 1993. |
| Genre: | Article |
| ProdID: | 70018230 |
| Citation Author: | Light, T. D.; Moll, S. H.; Bie, S. W.; Lee, G. K. |
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| Citation End Page: | 108 |
| Citation Issue: | 1-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geochemical Exploration |
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| Citation Number Of Pages: | 20 |
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| Citation Search Results Text: | Reconnaissance guidelines for gold exploration in Central Alaska; 1993; Article; Journal; Journal of Geochemical Exploration; Light, T. D.; Moll, S. H.; Bie, S. W.; Lee, G. K. |
| Citation Start Page: | 89 |
| Citation Volume: | 47 |
| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Reconnaissance guidelines for gold exploration in Central Alaska; 1993; Article; Journal; Journal of Geochemical Exploration; Light, T. D.; Moll, S. H.; Bie, S. W.; Lee, G. K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1993 00:00 -0600 |
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