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Studies by the U.S. Geological Survey in Alaska, 2004
U.S. Geological Survey
Professional Paper 1709-C

Thermobarometric Constraints on Mid-Cretaceous to Late Cretaceous Metamorphic Events in the Western Metamorphic Belt of the Coast Mountains Complex near Petersburg, Southeastern Alaska

By Glen R. Himmelberg and David A. Brew


photo of volcano summit area covered in snow
Sketch tectonostratigraphic map of southeastern Alaska, showing locations of the Coast Mountains Complex, the Coast shear zone, the western metamorphic belt, the great tonalite sill, and the Chugach, Wrangellia, and Alexander terranes.

The western metamorphic belt is part of the Coast Mountains Complex of southeastern Alaska and western Canada. This complex formed as a result of mid-Cretaceous through middle Eocene crustal shortening between the previously amalgamated Wrangellia and Alexander terranes (Insular superterrane) and previously accreted terranes of the North American continental margin (Intermontane superterrane). The western metamorphic belt, which ranges from a few kilometers to several tens of kilometers in width, records a complex sequence of contact-metamorphic and regional metamorphic events.

Download Professional Paper 1709-C as an 18-page PDF file (936 KB)

For questions about the content of this report, contact Dave Brew

Go to other chapters in this series: Haeussler, Peter J., and Galloway, John P., eds., 2005, Studies by the U.S. Geological Survey in Alaska, 2004: U.S. Geological Survey Professional Paper 1709.

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Maintained by: Michael Diggles
Created: November 29, 2005
Last modified: May 2, 2006 (mfd)