Pelitic and quartzose schist of the Alaska Range

Unit symbol: Pzarqm
Age range Devonian or older (541 to 358.9 Ma)
Lithology: Metamorphic
Group name: Schist and phyllite of the Alaska Range
Dominantly pelitic and quartz-rich schist and quartzite in the Mount Hayes (Nokleberg and others, 1992a), Healy (Csejtey and others, 1992), and Mount McKinley (Bela Csejtey, Jr., written commun., 1993) quadrangles; includes subordinate calc-schist and feldspathic schist. Generally underwent greenschist to amphibolite facies metamorphism, with or without greenschist facies retrogression. Unit is lithologically similar to units PzPxyqs and PzPxyqm in the Yukon-Tanana Upland; all three units contain metaigneous rocks that yield Devonian zircon ages

Source map information

Source map Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey, Miscellaneous Investigation Series Map I-1174, 15 pages, 1 plate, scale 1:250,000.
Symbol Pzsv
Unit name Quartzite, semischist, and metavolcanic rocks
Description Tan to light-greenish-gray, low-grade (greenschist facies), regionally metamorphosed quartzite, quartz semischist, quartz grit, metavolcanic rocks, and minor conglomerate, limestone, phyllite, and quartz-muscovite schist. Isoclinally folded.
Lithology Metamorphic

Correlated geologic units

Label PzZaqs
Description Pelitic and quartzose schist of the Alaska Range
Geologic age Paleozoic to Devonian
Geologic setting Sedimentary, undivided
Lithology Form Importance
Pelitic-schist < Metaclastic < Metasedimentary < Metamorphic Greenschist Major
Quartzite < Metaclastic < Metasedimentary < Metamorphic Greenschist Major
Phyllite < Metaclastic < Metasedimentary < Metamorphic Greenschist Minor