Metamorphic facies map of Southeastern Alaska; distribution, facies, and ages of regionally metamorphosed rocks
Dusel-Bacon C, Brew DA, Douglass SL. 1996. Metamorphic facies map of Southeastern Alaska; distribution, facies, and ages of regionally metamorphosed rocks. P 1497-D. U.S. Geological Survey. Reston, VA
Nearly all of the bedrock in Southeastern Alaska has been metamorphosed, much of it under medium-grade conditions during metamorphic episodes that were associated with widespread plutonism. The oldest metamorphisms affected probable arc rocks near southern Prince of Wales Island and occurred during early and middle Paleozoic orogenies. The predominant period of metamorphism and associated plutonism occurred during Early Cretaceous to early Tertiary time and resulted in the development of the Coast plutonic-metamorphic complex that extends along the inboard half of Southeastern Alaska. Middle Tertiary regional thermal metamorphism affected a large part of Baranof Island.
- Type
- Published Report
- Authors
- Dusel-Bacon, Cynthia; Brew, David; Douglass, Susan
- Date of Issue
- 1996
- Publisher
- U.S. Geological Survey
- Units
- GLBA
- Keywords
- Alaska, Alexander Archipelago, Baranof Island, Bedrock, Cenozoic, Chichagof Island, Coast Plutonic Complex, Cretaceous, Explanatory Text, Facies, Geologic Maps, Glacier Bay, grade, igneous activity, medium-grade metamorphism, Mesozoic, metamorphic belts, Metamorphic Rocks, Metamorphism, North America, Orogeny, Paleozoic, polymetamorphism, Prince of Wales Island, P-T conditions, regional metamorphism, site location maps, Southeastern Alaska, Tectonics, Tertiary, USGS