Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana
Professional Paper
1657
By: E. A. Du Bray and L.W. Snee
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Abstract
Cretaceous intrusions hosted by the Proterozoic Newland Formation. The northern intrusion, centered on Boulder Baldy, consists of outer, intermediate, and core zones composed of aegirine-augite quartz monzonite, hornblende quartz monzodiorite, and biotite granodiorite, respectively. The southern intrusion, north of Mount Edith, is compositionally indistinguishable from the intermediate zone of the northern intrusion.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana |
| Series title | Professional Paper |
| Series number | 1657 |
| DOI | 10.3133/pp1657 |
| Year Published | 2002 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Denver, CO |
| Description | 30 p. |
| Country | United States |
| State | Montana |
| County | Broadwater, Meagher |