| Abstract: | The North Amethyst vein system, which is hosted by ~27 Ma Carpenter Ridge Tuff and ~26 Ma Nelson Mountain Tuff, has two mineral associations separated by brecciation and sedimentation in the veins. The early association consists of quartz, rhodonite, hematite, magnetite, electrum, Mn carbonate, Au-Ag sulfide, Ag sulfosalt, and base metal sulfide minerals. The later mineral association cuts the Mn- and Au-bearing assemblages and consists of quartz, calcite, sericite, chlorite, hematite, adularia, fluorite, base metal sulfides, and Ag-bearing tetrahedrite. Detailed studies of the Pb isotope compositions of minerals of the vein system are described. Paragenetically early sulfide-rich vein assemblages have the least radiogenic galenas and generally also have the highest Au contents. Thus, identification of paragenetically early vein assemblages with relatively unradiogenic Pb isotope compositions similar to those of the North Amethyst area provides an additional exploration tool for Au in the central San Juan Mountains area. -from Authors |
| Genre: | Article |
| ProdID: | 70017420 |
| Citation Author: | Foley, N. K.; Ayuso, R. A. |
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| Citation End Page: | 1859 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Economic Geology |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Lead isotope compositions as guides to early gold mineralization: the North Amethyst vein system, Creede district, Colorado; 1994; Article; Journal; Economic Geology; Foley, N. K.; Ayuso, R. A. |
| Citation Start Page: | 1842 |
| Citation Volume: | 89 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Lead isotope compositions as guides to early gold mineralization: the North Amethyst vein system, Creede district, Colorado; 1994; Article; Journal; Economic Geology; Foley, N. K.; Ayuso, R. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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