Geology of Annette, Gravina, and Duke islands, southeastern Alaska ( USA).

G. E. Gehrels, J. B. Saleeby, H. C. Berg

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

Geological mapping, U-Pb (zircon) geochronometry, and conodont studies indicate that the major pre-Jurassic assemblages on Annette, Gravina, Duke, and adjacent small islands include pre-Middle Ordovician metavolcanic and metasedimentary rocks (Wales metamorphic suite): Cambrian metaplutonic rocks; Ordovician - Early Silurian volcanic (Descon Formation), dioritic, and gabbroic rocks; Silurian trondhjemitic plutons; Early Devonian sedimentary (Karheen Formation) and volcanic rocks; Late Triassic sedimentary and volcanic rocks (Hyd Group); and a large body of Late Triassic pyroxene gabbro.-from Authors

Original languageEnglish (US)
Pages (from-to)866-881
Number of pages16
JournalCanadian Journal of Earth Sciences
Volume24
Issue number5
DOIs
StatePublished - Jan 1 1987

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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