Duncan Canal


Facts


  • Official Name:
  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 15m (49ft)
  • Latitude: 56.5
  • Longitude: -133.1
  • Smithsonian VNum: 315050
  • Nearby Towns:
    • Petersburg 22 mi (36 km) NE
    • Kupreanof 22 mi (36 km) NE
    • Point Baker 22 mi (36 km) SW
    • Port Protection 23 mi (37 km) SW
    • Whale Pass 27 mi (43 km) SW

Description

From Wood and Kienle (1990) [1] : "Olivine-bearing tholeiitic basalt with average K-content, together with minor sodic alkalic basalts, overlie volcanic-rich gravel and glacial till along the southern coast of Kupreanof Island west of Duncan Canal. The flows are recognized in the field by their conspicuous fresh-appearing pahoehoe and aa surfaces. Two probable vents lie within the Mesozoic and Paleozoic rocks of the Duncan Canal fault zone north of the main exposures; the northern one contains scattered peridotite nodules. The relations of the main exposures to the subjacent middle Tertiary volcanic rocks of the Kuiu-Etolin volcanicplutonic belt are not clear at the western end of the field because the Holocene basalt is difficult to differentiate from the adjacent older basalt."

Name Origin

"Duncan Canal", as applied to the group of volcanic vents near the Duncan Canal waterway, is an informal name.


References Cited

[1] Volcanoes of North America: United States and Canada, 1990

Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.

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