Quick
Search: 
 
advanced search
 GSW Home    GeoRef Home    My GSW Alerts    Contact GSW    About GSW    Journals List    Help 
Geology GSW 2008 Users' Group Meeting
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS

Geology; November 2005; v. 33; no. 11; p. 881-884; DOI: 10.1130/G21822.1
© 2005 Geological Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via ISI Web of Science (4)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Clift, P. D.
Right arrow Articles by Kelemen, P. B.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Subduction erosion of the Jurassic Talkeetna-Bonanza arc and the Mesozoic accretionary tectonics of western North America

Peter D. Clift1, Terry Pavlis2, Susan M. DeBari3, Amy E. Draut4, Matthew Rioux5 and Peter B. Kelemen6

1 School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK
2 Department of Geology and Geophysics, University of New Orleans, New Orleans, Louisiana 70148, USA
3 Department of Geology, Western Washington University, Bellingham, Washington 98225, USA
4 University of California–Santa Cruz, Santa Cruz, California 95060,USA, and U.S. Geological Survey, 400 Natural Bridges Drive, Santa Cruz, California 95060, USA
5 Department of Geological Sciences, University of California–Santa Barbara, Santa Barbara, California 93106, USA
6 Lamont-Doherty Earth Observatory, Columbia University, P.O. Box 1000, 61 Route 9W, Palisades, New York 10964, USA

The Jurassic Talkeetna volcanic arc of south-central Alaska is an oceanic island arc that formed far from the North American margin. Geochronological, geochemical, and structural data indicate that the arc formed above a north-dipping subduction zone after ca. 201 Ma. Magmatism migrated northward into the region of the Talkeetna Mountains ca. 180 Ma. We interpret this magmatism as the product of removal of the original forearc while the arc was active, mainly by tectonic erosion. Rapid exhumation of the arc after ca. 160 Ma coincided with the sedimentation of the coarse clastic Naknek Formation. This exhumation event is interpreted to reflect collision of the Talkeetna arc with either the active margin of North America or the Wrangellia composite terrane to the north along a second north-dipping subduction zone. The juxtaposition of accreted trench sedimentary rocks (Chugach terrane) against the base of the Talkeetna arc sequence requires a change from a state of tectonic erosion to accretion, probably during the Late Jurassic (before 150 Ma), and definitely before the Early Cretaceous (ca. 125 Ma). The change from erosion to accretion probably reflects increasing sediment flux to the trench due to collision ca. 160 Ma.

Key Words: Alaska • terrane accretion • subduction • tectonic erosion • collision




This article has been cited by other articles:


Home page
Geol Soc Am BullHome page
J. M. Amato, A. O. Boullion, A. M. Serna, A. E. Sanders, G. L. Farmer, G. E. Gehrels, and J. L. Wooden
Evolution of the Mazatzal province and the timing of the Mazatzal orogeny: Insights from U-Pb geochronology and geochemistry of igneous and metasedimentary rocks in southern New Mexico
GSA Bulletin, March 1, 2008; 120(3-4): 328 - 346.
[Abstract] [Full Text] [PDF]


Home page
Geol Soc Am BullHome page
J. M. Trop
Latest Cretaceous forearc basin development along an accretionary convergent margin: South-central Alaska
GSA Bulletin, January 1, 2008; 120(1-2): 207 - 224.
[Abstract] [Full Text] [PDF]


Home page
Geol Soc Am BullHome page
M. Rioux, B. Hacker, J. Mattinson, P. Kelemen, J. Blusztajn, and G. Gehrels
Magmatic development of an intra-oceanic arc: High-precision U-Pb zircon and whole-rock isotopic analyses from the accreted Talkeetna arc, south-central Alaska
GSA Bulletin, September 1, 2007; 119(9-10): 1168 - 1184.
[Abstract] [Full Text] [PDF]


Home page
Journal of Sedimentary ResearchHome page
A. E. Draut and P. D. Clift
Sedimentary Processes in Modern and Ancient Oceanic Arc Settings: Evidence from the Jurassic Talkeetna Formation of Alaska and the Mariana and Tonga Arcs, Western Pacific
Journal of Sedimentary Research, March 1, 2006; 76(3): 493 - 514.
[Abstract] [Full Text] [PDF]




JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Geological Society of America