Geology of the Portage Pass Area, Alaska

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Abstract: The Portage Pass area is in south-central Alaska, and includes part of the narrow neck of land that joins the Kenai Peninsula with the mainland to the north. This region is in general mountainous, elevations ranging from sea level to more than 4,000 feet on the peaks bordering the area. Several glaciers, all of which are apparently receding, extend into the area. Vegetation, chiefly alder and cottonwood on the valley lowlands and some spruce and hemlock on the lower slopes, extends to an elevation of about 1,000 feet, above which the slopes are bare except for occasional clumps of … continued below

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iii, 25 p. : maps, tables, photographs ; 23 cm.

Creation Information

Barnes, Farrell F. 1943.

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Description

Abstract: The Portage Pass area is in south-central Alaska, and includes part of the narrow
neck of land that joins the Kenai Peninsula with the mainland to the north. This
region is in general mountainous, elevations ranging from sea level to more than
4,000 feet on the peaks bordering the area. Several glaciers, all of which are
apparently receding, extend into the area. Vegetation, chiefly alder and cottonwood
on the valley lowlands and some spruce and hemlock on the lower slopes,
extends to an elevation of about 1,000 feet, above which the slopes are bare
except for occasional clumps of brush.
The bedrock of the entire area is slate, argillite, and graywacke, apparently
part of the same great series that extends from the Kenai Peninsula into the
Prince William Sound region and is at least in part of Cretaceous age. The only
igneous rocks recognized in the area are a few acidic dikes and a small diabase dike.
Small, irregular quartz veinlets are widespread.
The structure is not only complex but, owing to extensive metamorphism, is
in many places obscure. A general northeast strike and steep to vertical dips of
both bedding and cleavage planes are the rule, but there appears to be some broad
folding along steeply northeast-pitching axes. Although no large faults have been
recognized, much movement has occurred along many small faults, shear zones,
and bedding planes. All observed faults and shear zones trend northeastward.
There are no mines in this area. Some mineralization of quartz veins was noted
at a few places, and some prospecting has been done, but no workable deposits
are known.

Physical Description

iii, 25 p. : maps, tables, photographs ; 23 cm.

Source

  • Mineral Resources of Alaska, 1939; pp. 211-235

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  • OCLC: 883401223
  • SuDoc Number: I 19.3:926-D
  • Report No.: USGS Bulletin 926-D
  • Archival Resource Key: ark:/67531/metadc944659

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Technical Report Archive and Image Library

The Technical Report Archive & Image Library (TRAIL) identifies, acquires, catalogs, digitizes and provides unrestricted access to U.S. government agency technical reports. The mission of TRAIL is to ensure preservation, discoverability, and persistent open access to government technical publications regardless of form or format.

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  • 1943

Added to The UNT Digital Library

  • Jan. 14, 2017, 10:15 p.m.

Description Last Updated

  • Jan. 11, 2018, 2:36 p.m.

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Barnes, Farrell F. Geology of the Portage Pass Area, Alaska, report, 1943; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc944659/: accessed June 9, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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