Two-event genesis of Butte lode veins: Geologic and geochronologic evidence from ore veins, dikes, and host plutons

By: , and 

Links

Abstract

The long-standing ore-genesis model for world-class deposits of the Butte mining district, Montana, is of deep pre-Main Stage porphyry Cu-Mo and overlying Main Stage Ag-Zn-Cu-zoned lode veinsformed from discrete hydrothermal systems related to rhyolite dikes. The lode-specific model describes metals zones that formed in the lode veins as hydrothermal processes diminished in intensity (changing temperature and chemical characteristics) outward from the district center. New geologic and multi-method geochronologic studies pro- vide new timing constraints on the lode veins and reevaluation of geologic relations (Lund and others, 2018), leading to a new model for formation of the lode veins and their relations to stockwork Cu-Mo deposits and igneous events.

Study Area

Publication type Conference Paper
Publication Subtype Conference Paper
Title Two-event genesis of Butte lode veins: Geologic and geochronologic evidence from ore veins, dikes, and host plutons
Year Published 2021
Language English
Publisher Montana Bureau of Mines and Geology
Contributing office(s) Central Mineral and Environmental Resources Science Center, Eastern Mineral and Environmental Resources Science Center, Geology, Geophysics, and Geochemistry Science Center
Description 3 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Proceedings of the Montana Mining and Mineral Symposium 2019
First page 71
Last page 73
Conference Title Montana Mining and Mineral Symposium 2019
Conference Date October 9-11, 2019
Country United States
State Montana
Other Geospatial Butte mining district
Google Analytic Metrics Metrics page
Additional publication details