EVIDENCE FOR PROTEROZOIC AND LATE CRETACEOUS EARLY TERTIARY ORE-FORMING EVENTS IN THE COEUR-DALENE DISTRICT, IDAHO AND MONTANA

Authors
LEACH DL HOFSTRA AH CHURCH SE SNEE LW VAUGHN RB ZARTMAN RE
Citation
Dl. Leach et al., EVIDENCE FOR PROTEROZOIC AND LATE CRETACEOUS EARLY TERTIARY ORE-FORMING EVENTS IN THE COEUR-DALENE DISTRICT, IDAHO AND MONTANA, Economic geology and the bulletin of the Society of Economic Geologists, 93(3), 1998, pp. 347-359
Citations number
56
Categorie Soggetti
Geochemitry & Geophysics
Journal title
Economic geology and the bulletin of the Society of Economic Geologists → ACNP
ISSN journal
03610128
Volume
93
Issue
3
Year of publication
1998
Pages
347 - 359
Database
ISI
SICI code
0361-0128(1998)93:3<347:EFPALC>2.0.ZU;2-4
Abstract
New Ar-40/Ar-39 age spectra on sericite and lead isotope data on tetra hedrite, siderite, galena, bournonite, and stibnite, together with pre viously published isotopic, geochemical, and geologic studies provide evidence for two major vein-forming events in the Coeur d'Alene distri ct 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) fo rmed 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 go ld-bearing quartz veins (Murry subdistrict) formed in Late Cretaceous to early Teritary time.