Development of inverted metamorphic isograds in the western metamorphic belt, Juneau, Alaska
Journal of Metamorphic Geology
By: G. R. Himmelberg, D. A. Brew, and A. B. Ford
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Abstract
An inverted metamorphic gradient is preserved in the western metamorphic belt near Juneau, Alaska. Detailed mapping of pelitic single-mineral isograds, systematic changes in mineral assemblages, and silicate geothermometry indicate that thermal peak metamorphic conditions increase structurally upward over a distance of about 8 km. Silicate geobarometry suggests that the thermal peak metamorphism occurred under pressures of 9-11 kbar. Our preferred interpretation of the cause of the inverted gradient is that it formed during compression of a thickened wedge of relatively wet and cool rocks in response to heat flow associated with the formation and emplacement of tonalite sill magma. -from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Development of inverted metamorphic isograds in the western metamorphic belt, Juneau, Alaska |
| Series title | Journal of Metamorphic Geology |
| Volume | 9 |
| Issue | 2 |
| Year Published | 1991 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Metamorphic Geology |
| First page | 165 |
| Last page | 180 |
| Google Analytic Metrics | Metrics page |