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

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

doi:10.1139/e87-086

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

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

Geosciences

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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 language	English (US)
Pages (from-to)	866-881
Number of pages	16
Journal	Canadian Journal of Earth Sciences
Volume	24
Issue number	5
DOIs	https://doi.org/10.1139/e87-086
State	Published - 1987

ASJC Scopus subject areas

General Earth and Planetary Sciences

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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",

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T1 - Geology of Annette, Gravina, and Duke islands, southeastern Alaska ( USA).

AU - Gehrels, G. E.

AU - Saleeby, J. B.

AU - Berg, H. C.

PY - 1987

Y1 - 1987

N2 - 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

AB - 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

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

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