Interpretation of a high-grade Precambrian terrane in northern Idaho
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Abstract
A terrane of high-grade metamorphic rocks in northern Idaho and northeastern Washington is almost completely surrounded by low-grade rocks of the Precambrian Belt Supergroup. The high-grade terrane includes both Belt and pre-Belt rocks. Four events of folding and metamorphism occurred in the high-grade terrane. The first three events may have been associated with the Late Cretaceous emplacement of quartz monzonite of the Kaniksu batholith; the fourth may have been associated with a slightly later emplacement of granodiorite or with a Tertiary plutonic and volcanic episode. A much older event of plutonism in the high-grade terrane is recorded by zircon, which was dated by the Pb-U method at 1,500 m.y. from pre-Belt meta-igneous augen gneiss. Evidence of regional events intermediate in age between 1,500 and 100 m.y. has been found in the surrounding low-grade rocks but not in the high-grade terrane.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Interpretation of a high-grade Precambrian terrane in northern Idaho |
| Series title | Geological Society of America Bulletin |
| DOI | 10.1130/0016-7606(1973)84<1999:IOAHPT>2.0.CO;2 |
| Volume | 84 |
| Issue | 6 |
| Year Published | 1973 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 5 p. |
| First page | 1999 |
| Last page | 2004 |
| Country | United States |
| State | Idaho |
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