Alaskan Geological and Geophysical Transect - download pdf or read online

By Ruth A. M. Schmidt, Warren J. Nokleberg, Robert A. Page

ISBN-10: 0875906532

ISBN-13: 9780875906539

ISBN-10: 1118667360

ISBN-13: 9781118667361

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Extra resources for Alaskan Geological and Geophysical Transect

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Below VP 4000 the subhorizontal top of the middle reflection band truncates deeper reflections, forming a sharp angular discordance. We believe that many, if not all, reflections forming the middle and upper bands are from thrust faults and that the main structure of reflective rocks is thrust-fault bounded layers that are 1 to 3-km thick. In particular, the large number of reflections that splay upward from the base of the S N 6 O I KILOMETERS FIGURE 3 Detail of the migrated Chugach seismic section.

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.

The northern two-thirds of the Chugach seismic section, the part obtained over the Copper River basin, shows mainly discontinuous reflections between 0 and 4 s and vibrator points (VP) 1000 and 3000 . , in press]. Neither the bottom of the basin nor deep crustal layers of the Peninsular terrane are evident. The pan of the Chugach seismic line collected near the Border Ranges fault system is also unrevealing. No obvious continuous reflections nor lateral discontinuities in the character of faint reflections mark the location of thick ultramafic and m&c rocks (the Border Ranges ultramafic-mafic assem- blage), which outcrop along the north side of the fault system.

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Alaskan Geological and Geophysical Transect by Ruth A. M. Schmidt, Warren J. Nokleberg, Robert A. Page


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