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Additional info for Alaskan Geological and Geophysical Transect: Valdez to Coldfoot, Alaska, June 24 - July 5, 1989 (Field Trip Guidebooks)
Coney, and G. Plafker, Lithotectonic terrane map of Alaska, h N. J. Silberling and D. L. S. Geological Survey Open-File Report 84-523, A1-A12, 4 sheets, scale 1:2,500,000, 1984. Page, R. , C. D. Stephens, and J. C. Lahr, Seismicity of the Wrangell and Aleutian Wadati-Benioff zones and the North American plate along the Trans-Alaska Crustal Transect, Chugach Mountains and Copper River basin, southern Alaska, Journal of Geophysical Research, 1989, in press. , W. J. Nokleberg, and J. S. Lull, Bedrock geology and tectonic evolution of the Wrangellia, Peninsular, and Chugach terranes along the Trans-Alaska Crustal Transect in the northern Chugach Mountains and southern Copper River basin, Journal of Geophysical Research, 1989, in press.
These include the following packages: A--layers 5-7, B--layers 8-9, and C--layer 11A. The inferred underplated sequence terminates southward at or near the Contact fault, northward beneath the southern Peninsular terrane, near a crustal "root" (see below), and downward at the present Wrangell subduction zone. ) age for the interbedded and interfaulted metaflysch of the Chugach terrane and by a 50-Ma age for intrusive granitic rocks. The sequence most likely represents fragments of the Kula plate.
The narrow view of crustal structure afforded by both seismic sections also complicates interpretation because we cannot determine whether or not some layered reflections represent a single horizon that was duplicated along thrust faults. Geosystems Corporation GEOCOR IV, sign bit 4 24 Symmetrical split, 15360 m-0-15360 m 30 1024 128 120 5 Litton 3 11 vibrators 135,000 Varisweep, 6 downsweeps repeated twice at each VP 20 10-30 6 geophones deployed in a 2 m cluster MAIN FEATURES OF THE CHUGACH SEISMIC SECTION The main geologic features that underlie the region crossed by the Chugach seismic line are the Chugach and Peninsular tectonostratigraphic terranes.