LIDAR-BASED MAPS OF ACTIVE TRACES OF THE FAIRWEATHER FAULT IN GLACIER BAY NATIONAL PARK, ALASKA

Making a National Park Service (NPS) visitor map of a large, famous park such as Glacier Bay involves careful planning and many people. Preliminary work on the Glacier Bay map required a site visit to Alaska, consultations with park staff, and observing visitors using maps on board a cruise ship. The paper examines various mountain-mapping challenges, including shaded relief, landcover, glaciers, fjord bathymetry, braided rivers, and place names. The paper then ties these strands together by discussing the design of the final brochure map.

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Colonization and succession of invertebrate communities in a new stream in Glacier Bay National Park, Alaska

Freshwater Biology ◽

10.1111/j.1365-2427.1994.tb01134.x ◽

1994 ◽

Vol 32 (2) ◽

pp. 387-400 ◽

Cited By ~ 37

Author(s):

ALEXANDER M. MILNER

Keyword(s):

National Park ◽

Invertebrate Communities ◽

Glacier Bay ◽

Glacier Bay National Park

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The Border Ranges fault system in Glacier Bay National Park, Alaska: evidence for major early Cenozoic dextral strike-slip motion

Canadian Journal of Earth Sciences ◽

10.1139/e96-096 ◽

1996 ◽

Vol 33 (9) ◽

pp. 1268-1282 ◽

Cited By ~ 12

Author(s):

Kevin J. Smart ◽

Terry L. Pavlis ◽

Virginia B. Sisson ◽

Sarah M. Roeske ◽

Lawrence W. Snee

Keyword(s):

National Park ◽

Strike Slip ◽

Fault System ◽

Glacier Bay ◽

Oblique Convergence ◽

Glacier Bay National Park ◽

Wrangellia Terrane ◽

Early Cenozoic ◽

Dextral Strike Slip ◽

Slip Motion

The Border Ranges fault system of southern Alaska, the fundamental break between the arc basement and the forearc accretionary complex, is the boundary between the Peninsular–Alexander–Wrangellia terrane and the Chugach terrane. The fault system separates crystalline rocks of the Alexander terrane from metamorphic rocks of the Chugach terrane in Glacier Bay National Park. Mylonitic rocks in the zone record abundant evidence for dextral strike-slip motion along north-northwest-striking subvertical surfaces. Geochronologic data together with regional correlations of Chugach terrane rocks involved in the deformation constrain this movement between latest Cretaceous and Early Eocene (~50 Ma). These findings are in agreement with studies to the northwest and southeast along the Border Ranges fault system which show dextral strike-slip motion occurring between 58 and 50 Ma. Correlations between Glacier Bay plutons and rocks of similar ages elsewhere along the Border Ranges fault system suggest that as much as 700 km of dextral motion may have been accommodated by this structure. These observations are consistent with oblique convergence of the Kula plate during early Cenozoic and forearc slivering above an ancient subduction zone following late Mesozoic accretion of the Peninsular–Alexander–Wrangellia terrane to North America.

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