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This outcrop range lies just 12-km north of the surface trace of the Contact fault system, the suture between the Chugach and the more outboard terranes to the south. The approximate correspondence between the projected outcrop and the suture trace supports our contention that the change in structural style revealed by the reflection zones lies near the lower boundary of the Chugach terrane. MAIN FEATURES OF THE DENALI SEISMIC SECTION Data along the Denali seismic line reveal the crustal structure of the eastern Alaska Range near the strike slip Denali fault.
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, J. Geophys. , 1989, in press. J. S. Lull, Stratigraphy, structure and tectonics of southern Peninsular and northe m Chugach terranes along the Trans-Alaska Crustal transect, eastern Chugach Mountains, Alaska, J. Geophys. , 1989, in press. Silver. J. A. H. S h i ~ l e v . comments on the of accretionary wedges, ~ k o l o gy, u , 6 - 9 , 1985.
J. E. L. Turner, unpub. data, 1986). The oldest age of 1,369 Ma may represent a younger plutonic rock containing excess argon. The intermediate ages of 282 to 306 Ma may be a Late Pennsylvanian and Early Permian age of intrusion. The younger ages of 130 and 131 Ma are interpreted as minimum ages of regional metamorphism, as discussed below. The relatively youngest sequence consists of schistose granitic plutons, mainly biotite granodiorite and granite, with lesser biotite-muscovite trondhjemite and quartz diorite.