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Lead isotope compositions as guides to early gold mineralization: the North Amethyst vein system, Creede district, Colorado

Economic Geology

By:
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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

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Lead isotope compositions as guides to early gold mineralization: the North Amethyst vein system, Creede district, Colorado
Series title:
Economic Geology
Volume
89
Issue:
8
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Economic Geology
First page:
1842
Last page:
1859
Number of Pages:
18