Distribution, facies, ages, and proposed tectonic associations of regionally metamorphosed rocks in Southwestern Alaska and the Alaska Peninsula
Cynthia Dusel-Bacon, Elizabeth O. Doyle, Stephen E. Box
1996, Professional Paper 1497-B
The oldest dated metamorphic sequence in Alaska, the fault-bounded Kilbuck Terrane, consists of continental rocks that were metamorphosed under amphibolite-facies conditions during early Proterozoic (1.77 Ga) time. Proterozoic or early Paleozoic metamorphic ages are also possible for greenschist- and amphibolite-facies continental rocks in interior Alaska (Ruby and Nixon Fork terranes)....
Mineral resource potential of the Survey Pass quadrangle, Brooks Range, Alaska
D. J. Grybeck, S.W. Nelson, J. B. Cathrall, J. W. Cady, J.R. LeCompte
1996, Miscellaneous Field Studies Map 1176-I
No abstract available....
Thermal evolution of sedimentary basins in Alaska
Mark J. Johnsson, David G. Howell, editor(s)
1996, Bulletin 2142
The complex tectonic collage of Alaska is reflected in the conjunction of rocks of widely varying thermal maturity. Indicators of the level of thermal maturity of rocks exposed at the surface, such as vitrinite reflectance and conodont color alteration index, can help constrain the tectonic evolution of such complex regions and, when combined with petrographic, modern...
Complete bouguer and isostatic gravity maps of the Bethel and southern part of the Russian Mission quadrangles, southwestern Alaska
R. L. Morin
1996, Miscellaneous Field Studies Map 2226-B
Generalized thermal maturity map of Alaska
M. J. Johnsson, D. G. Howell
1996, IMAP 2494
No abstract available....
Organic geochemistry applied to environmental assessments of Prince William Sound, Alaska, after the Exxon Valdez oil spill—a review
A.E. Bence, Keith A. Kvenvolden, M.C. Kennicutt II
1996, Organic Geochemistry (24) 7-42
Organic geochemistry played a major role in the environmental assessments conducted following the Exxon Valdez oil spill, which occurred on March 24, 1989, and released about 258,000 bbls (41 million liters) of Alaska North Slope crude oil into Prince William Sound. Geochemical analyses of more than 15,000 sediment, tar, and biological samples...
Overview of studies to determine injury caused by the Exxon Valdez Oil Spill to marine mammals
Thomas R. Loughlin, Brenda E. Ballachey, B.A. Wright
S.D. Rice, R.B. Spies, D.A. Wolfe, B.A. Wright, editor(s)
1996, Book, Proceedings of the Exxon Valdez oil spill symposium, American Fisheries Society Symposium 18
Marine mammal damage assessment studies after the Exxon Valdez oil spill concentrated on sea otters, harbor seals, Steller sea lions, killer whales, and humpback whales. Sea otter and harbor seals were the most affected marine mammal; it was estimated that several...
Comparative demography of sea otter populations
James A. Estes, Daniel F. Doak, James L. Bodkin, Ronald J. Jameson, Daniel H. Monson, Jon Watt, M. Tim Tinker
1996, Endangered Species UPDATE (13) 11-13
Population trends are poorly documented and demographic information is typically lacking for many carnivorous mammals. The sea otter (Enhydru lutris) has a well known history of decline and recovery, and while many other species have declined as precipitously, few have recovered so spectacularly. Generally speaking, northern populations (remnants within the...
The Border Ranges fault system in Glacier Bay National Park, Alaska: Evidence for major early Cenozoic dextral strike-slip motion
K.J. Smart, T.L. Pavlis, V.B. Sisson, S. M. Roeske, L.W. Snee
1996, Canadian Journal of Earth Sciences (33) 1268-1282
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...
20th-century glacial-marine sedimentation in Vitus Lake, Bering Glacier, Alaska, U.S.A.
B. F. Molnia, A. Post, P.R. Carlson
1996, Annals of Glaciology (22) 205-210
Vitus Lake, the ice-marginal basin at the southeastern edge of Bering Glacier, Alaska, U.S.A., is a site of modern, rapid, glacial-marine sedimentation. Rather than being a fresh-water lake, Vitus Lake is a tidally influenced, marine to brackish embayment connected to the Pacific Ocean by an inlet, the Seal River. Vitus...
Late quaternary environments, Denali National Park and Preserve, Alaska
Scott A. Elias, S. K. Short, Christopher F. Waythomas
1996, Arctic (49) 292-305
Late Quaternary pollen, plant macrofossils, and insect fossils were studied from sites along three rivers in the foothills north of the Alaska Range in Denali National Park and Preserve. The aim was to carry out a reconnaissance of late Quaternary organic sediments in the region, emphasizing the mid-Wisconsin, or Boutellier...
Monitoring the status of wild sea otter populations: field studies and techniques
James L. Bodkin, Brenda E. Ballachey
1996, Endangered Species UPDATE (13) 14-20
Assessing variability and trends in Arctic sea ice distribution using satellite data
G. I. Belchansky, Ilia N. Mordvintsev, David C. Douglas
1996, Conference Paper, Proceedings, IGARSS 1996
Trends in the annual minimum, minimum monthly-mean, and the sea ice extent at the end of August were investigated for the Barents and western Kara Seas and adjacent parts of the Arctic Ocean during 1966 to 1994 using data from Russian ice maps (1974-1994), Kosmos-Okean and ALMAZ SAR satellite series...
Evidence from cytochrome b sequences and allozymes for a new species of alcid: The long-billed murrelet (Brachyramphus perdix)
Vicki L. Friesen, John F. Piatt, Allan J. Baker
1996, The Condor (98) 681-690
Marbled Murrelets (Brachyramphus marmoratus) are coastal seabirds that breed predominantly in old-growth forest throughout the North Pacific. Presently they are classified into two phenotypically distinct subspecies: one in North America (B. m. marmoratus) and one in Asia (B. m. perdix). The Asian form was classified as a separate species in...
Nesting success of Northern Pintails on the coastal Yukon-Kuskokwim Delta, Alaska
Paul L. Flint, J. Barry Grand
1996, The Condor (98) 54-60
We studied nesting chronology and success of Northern Pintails (Anas acuta) on the coastal Yukon-Kuskokwim Delta, Alaska during the summers of 1991-1993. We found a total of 795 nests during three annual searches of a 27.4 km2 area. Minimum nest density averaged 9.67 nests per km2. Nesting success varied among...
A catastrophic flood caused by drainage of a caldera lake at Aniakchak Volcano, Alaska, and implications for volcanic hazards assessment
C. F. Waythomas, J. S. Walder, R. G. McGimsey, C.A. Neal
1996, Geological Society of America Bulletin (108) 861-871
Aniakchak caldera, located on the Alaska Peninsula of southwest Alaska, formerly contained a large lake (estimated volume 3.7 × 109 m3) that rapidly drained as a result of failure of the caldera rim sometime after ca. 3400 yr B.P. The peak discharge of the resulting flood was estimated using three methods:...
Use of SAR data to study active volcanoes in Alaska
K.G. Dean, K. Engle, Z. Lu, J. Eichelberger, T. Near, M. Doukas
1996, Earth Observation Quarterly 21-23
Synthetic Aperture Radar (SAR) data of the Westdahl, Veniaminof, and Novarupta volcanoes in the Aleutian Arc of Alaska were analysed to investigate recent surface volcanic processes. These studies support ongoing monitoring and research by the Alaska Volcano Observatory (AVO) in the North Pacific Ocean Region. Landforms and possible crustal deformation...
Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U.S.A.
T.A. Heinrichs, L.R. Mayo, K.A. Echelmeyer, W.D. Harrison
1996, Journal of Glaciology (42) 110-122
Black Rapids Glacier, a surge-type glacier in the Alaska Range, most recently surged in 1936–37 and is currently in its quiescent phase. Mass balance, ice velocity and thickness change have been measured at three to ten sites from 1972 to 1994. The annual speed has undergone cyclical...
Population delineation of polar bears using satellite collar data
R. Bethke, Mitchell K. Taylor, Steven C. Amstrup, Francois Messier
1996, Ecological Applications (6) 311-317
To produce reliable estimates of the size or vital rates of a given population, it is important that the boundaries of the population under study are clearly defined. This is particularly critical for large, migratory animals where levels of sustainable harvest are based on these estimates, and where small errors...
Results of Bayesian methods depend on details of implementation: An example of estimating salmon escapement goals
Milo D. Adkison, R. M. Peterman
1996, Fisheries Research (25) 155-170
Bayesian methods have been proposed to estimate optimal escapement goals, using both knowledge about physical determinants of salmon productivity and stock-recruitment data. The Bayesian approach has several advantages over many traditional methods for estimating stock productivity: it allows...
Isolation and characterization of novel microsatellite loci: Cross-species amplification and population genetic applications
Kim T. Scribner, Judy R. Gust, Raymond L. Fields
1996, Canadian Journal of Fisheries and Aquatic Sciences (53) 833-841
Observations and analysis of self-similar branching topology in glacier networks
D.B. Bahr, S.D. Peckham
1996, Journal of Geophysical Research B: Solid Earth (101) 25511-25521
Glaciers, like rivers, have a branching structure which can be characterized by topological trees or networks. Probability distributions of various topological quantities in the networks are shown to satisfy the criterion for self-similarity, a symmetry structure which might be used to simplify future models of glacier dynamics. Two analytical methods...
Outburst floods from glacier-dammed lakes: The effect of mode of lake drainage on flood magnitude
Joseph S. Walder, John E. Costa
1996, Earth Surface Processes and Landforms (21) 701-723
Published accounts of outburst floods from glacier‐dammed lakes show that a significant number of such floods are associated not with drainage through a tunnel incised into the basal ice—the process generally assumed—but rather with ice‐marginal drainage, mechanical failure of part of the ice dam, or both. Non‐tunnel floods are strongly correlated with...
Breeding populations of northern pintails have similar mitochondrial DNA
M. A. Cronin, J.B. Grand, Daniel Esler, D.V. Derksen, K.T. Scribner
1996, Canadian Journal of Zoology (74) 992-999
Northern pintails (Anas acuta) are highly nomadic, which may result in high levels of gene flow among nesting areas. To assess the extent of genetic differentiation among nesting areas, we analyzed mitochondrial DNA (mtDNA) variation in northern pintail females from three regions: Alaska, California, and midcontinent prairies and parklands. Abundant mtDNA...
Late Paleocene Arctic Ocean shallow-marine temperatures from mollusc stable isotopes
Karen L. Bice, Michael A. Arthur, Louie Marincovich Jr.
1996, Paleoceanography (11) 241-249
Late Paleocene high-latitude (80°N) Arctic Ocean shallow-marine temperatures are estimated from molluscan δ18O time series. Sampling of individual growth increments of two specimens of the bivalve Camptochlamys alaskensis provides a high-resolution record of shell stable isotope composition. The heavy carbon isotopic values of the specimens support a late Paleocene age...
