GEOLOGY OF SOUTHERN PRINCE OF WALES ISLAND, SOUTHEASTERN ALASKA.

George E Gehrels, Jason B. Saleeby

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Geologic mapping on southern Prince of Wales Island combined with U-Pb (zircon) geochronologic, geochemical, and conodont studies yield new information about the early Paleozoic geologic framework and evolution of the southern Alexander terrane. The oldest rocks recognized consist of arc-type(? ) metavolcanic and metasedimentary rocks (Wales metamorphic suite) which were derived from late Proterozoic(? )-Cambrian protoliths. The middle Silurian-earliest Devonian Klakas orogeny marked the end of arc-type magmatism; it is manifest on southern Prince of Wales Island by regional imbrication on southwest-vergent thrust faults, penetrative brecciation and pervasive hydrothermal alteration of pre-Devonian rocks in some areas, and at least several kilometers of structural uplift. Post-Devonian rocks on southern Prince of Wales Island include the Bokan Mountain Granite (Jurassic), basaltic to dacitic(? ) dike swarms, and mid-Cretaceous granodiorite and diorite bodies.

Original languageEnglish (US)
Pages (from-to)123-137
Number of pages15
JournalBulletin of the Geological Society of America
Volume98
Issue number2
StatePublished - Feb 1987

Fingerprint

geology
rock
imbrication
metavolcanic rock
dike swarm
conodont
metasedimentary rock
diorite
thrust fault
hydrothermal alteration
protolith
granodiorite
orogeny
Silurian
magmatism
terrane
Proterozoic
zircon
granite
Paleozoic

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

GEOLOGY OF SOUTHERN PRINCE OF WALES ISLAND, SOUTHEASTERN ALASKA. / Gehrels, George E; Saleeby, Jason B.

In: Bulletin of the Geological Society of America, Vol. 98, No. 2, 02.1987, p. 123-137.

Research output: Contribution to journalArticle

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