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Some accreted volcanic rocks of Alaska and their elemental abundances

By
Fred Barker
Fred Barker
U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225
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John N. Aleinikoff
John N. Aleinikoff
U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225
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Stephen E. Box
Stephen E. Box
U.S. Geological Survey, Room 656, West 920 Riverside Avenue, Spokane, Washington 99201
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Bernard W. Evans
Bernard W. Evans
Department of Geological Sciences, University of Washington, Seattle, Washington 98195
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George E. Gehrels
George E. Gehrels
Department of Geosciences, University of Arizona, Tucson, Arizona 85721
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Malcolm D. Hill
Malcolm D. Hill
Department of Geology, Northeastern University, Boston, Massachusetts 02115
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Anthony J. Irving
Anthony J. Irving
Department of Geological Sciences, University of Washington, Seattle, Washington 98195
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John S. Kelley
John S. Kelley
U.S. Geological Survey, P.O. Box 53, Anchorage, Alaska 99513
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William P. Leeman
William P. Leeman
National Science Foundation, Washington, D.C. 20550
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John S. Lull
John S. Lull
U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025
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Warren J. Nokleberg
Warren J. Nokleberg
U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025
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John S. Pallister
John S. Pallister
U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225
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Brian E. Patrick
Brian E. Patrick
Department of Geological Sciences, University of Washington, Seattle, Washington 98195
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George Plafker
George Plafker
U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025
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Charles M. Rubin
Charles M. Rubin
Division of Geological Sciences, California Institute of Technology, Pasadena, California 91125
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Published:
January 01, 1994

Abstract

This chapter describes and gives elemental abundances of many of the accreted volcanic rocks and of a few hypabyssal rocks of Alaska. These rocks range from early Paleozoic (or perhaps late Precambrian) to Eocene age. All formed prior to accretion of the terrane containing them and thus were generated either as primary features in the ancestral Pacific Ocean or on terranes or superterranes carried by plates underlying that ocean.

These accreted volcanic rocks are important in terms of continental growth by accretion of oceanic rocks. Various workers have asserted that such growth is by accretion of intraoceanic island arcs. This assertion, however, must be appreciably modified for the ca. 400,000-km2 region of southern and central Alaska that is underlain by accreted rocks. Though these rocks are not known in sufficient detail to yield a precise figure, I estimate that no more than 70 to 75 percent of this newly formed crust consists of former island arcs and arc-derived epiclastic sedimentary rocks.

Most of the tectonostratigraphic (lithotectonic) terranes of Alaska have minor exposures of volcanic rocks. Accounts of local and regional geology of the state contain cursory to extensive descriptions of such rocks. However, a catalog of such occurrences is not considered appropriate for this volume, and we discuss here only rocks studied by modern methods. The particular terranes containing these rocks are shown on Plate 13 (Barker and others, this volume), whereas all tectonostratigraphic terranes of Alaska are shown on Plate 3 (Silberling and others, this volume).

Though virtually all

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Contents

DNAG, Geology of North America

The Geology of Alaska

George Plafker
George Plafker
U.S. Geological Survey MS 904, 345 Middlefield Road Menlo Park, California 94025
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Henry C. Berg
Henry C. Berg
115 Malvern Avenue Fullerton, California 92632
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Geological Society of America
Volume
G-1
ISBN electronic:
9780813754536
Publication date:
January 01, 1994

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