Evidence for Proterozoic and late Cretaceous-early Tertiary ore-forming events in the Coeur d'Alene district, Idaho and Montana
Economic Geology
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Abstract
New 40 Ar/ 39 Ar age spectra on sericite and lead isotope data on tetrahedrite, siderite, galena, bournonite, and stibnite, together with previously published isotopic, geochemical, and geologic studies provide evidence for two major vein-forming events in the Coeur d'Alene district and surrounding areas of the Belt basin. The data suggest that the zinc- and lead-rich veins (e.g., Bunker Hill and Star-Morning mines) formed in the Proterozoic (1.0 Ga), whereas the silver-rich veins (e.g., Silver belt mines), antimony veins (e.g., U.S. Antimony mine), and gold-bearing quartz veins (Murry subdistrict) formed in Late Cretaceous to early Tetitary time.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Evidence for Proterozoic and late Cretaceous-early Tertiary ore-forming events in the Coeur d'Alene district, Idaho and Montana |
| Series title | Economic Geology |
| DOI | 10.2113/gsecongeo.93.3.347 |
| Volume | 93 |
| Issue | 3 |
| Publication Date | May 01, 1998 |
| Year Published | 1998 |
| Language | English |
| Publisher | Society of Economic Geologists |
| Description | 13 p. |
| First page | 347 |
| Last page | 359 |