Crystalline rocks of the Strawberry Lake area, Front Range, Colorado

Bulletin 1937



This report is a petrographic and geochemical study of the bedrock and a petrologic discussion based on felsic-mafic and silica-saturation ratios of the Strawberry Lake area. This volume is published as chapters A and B. These chapters are not available separately

The Strawberry lake area lies between the Continental Divide and Granby, Colorado, just north of Tabernash. It is underlain by Proterozoic rocks composed of biotite gneiss and two plutons-Boulder Creek Granodiorite of the Routt Plutonic Suite and Silver Plume Granite of the Berthoud Plutonic Suite. Relict enclaves of biotite gneiss are not uncommon in the Boulder Creek Granodiorite, in the Silver Plume Granite, and in the granitic enclaves in the biotite gneiss. Granitic and mafic enclaves in the Boulder Creek Granodiorite, granitic enclaves in the Silver Plume Granite and in the biotite gneiss, and a Tertiary andesite porphyry dike complete the rock types.

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Crystalline rocks of the Strawberry Lake area, Front Range, Colorado
Series title Bulletin
Series number 1937
DOI 10.3133/b1937
Year Published 1991
Language English
Publisher U.S. Geological Survey
Description Report: 61 p.; Plate: 20.03 x 18.13 inches
Country United States
State Colorado
Other Geospatial Strawberry Lake area