Metamorphic differentiates in the blackbird mining district, Lemhi County, Idaho
Economic Geology
By: Wayne A. Roberts
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Abstract
Quartz pods and quartz veins devoid of economic minerals occur in the cobalt-copper mineralized Blackbird mining district in Lemhi County, Idaho. These barren quartz bodies are found in regionally and thermally metamorphosed rocks of the Yellowjacket formation (Belt series) of Pre-cambrian age and are believed to be derived from the enclosing quartz-biotite and quartz-biotite-garnet-chloritoid schists by metamorphic differentiation. Other rocks that possibly are products of metamorphic differentiation are discussed. Two zones of regional metamorphism are recognized, a biotite zone and a garnet zone. Contact metamorphism associated with the granitic intrusive rocks of the Idaho batholith is recognized adjacent to the batholith.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Metamorphic differentiates in the blackbird mining district, Lemhi County, Idaho |
| Series title | Economic Geology |
| DOI | 10.2113/gsecongeo.48.6.447 |
| Volume | 48 |
| Issue | 6 |
| Year Published | 1953 |
| Language | English |
| Publisher | Society of Economic Geologists |
| Description | 10 p. |
| First page | 447 |
| Last page | 456 |
| Country | United States |
| State | Idaho |
| County | Lemhi County |
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