Tide gage measurements of uplift along the south coast of Alaska
James C. Savage, George Plafker
1991, Journal of Geophysical Research B: Solid Earth (96) 4325-4335
Annual mean sea levels along the south coast of Alaska are used to measure uplift along the Alaska‐Aleutian subduction zone. Oceanographic effects are removed from the observed annual mean sea levels by subtracting a correction that is proportional to the sea level fluctuations observed in southeast Alaska. That correction is...
Rapid dewatering of the crust deduced from ages of mesothermal gold deposits
R.J. Goldfarb, L.W. Snee, L.D. Miller, R.J. Newberry
1991, Nature (354) 296-298
The large-scale migration of fluids through the continental crust has been well documented, but there is no consensus regarding the timing of fluid migration relative to orogenic episodes, or rates of crustal dewatering1. Here we present40Ar/39Ar dates for muscovites from quartz veins along a major shear zone in southeast Alaska,...
Strain accumulation along the Denali Fault at the Nenana River and Delta River Crossings, Alaska
James C. Savage, Michael Lisowski
1991, Journal of Geophysical Research B: Solid Earth (96) 14481-14892
Surveys of trilateration networks across the Denali fault at the Nenana River in 1982, 1984, and 1988 and at the Delta River in 1975, 1979, 1982, and 1984 indicate a minor (0.10±0.04 μstrain/yr) northeastward uniaxial extension. The component of right‐lateral shear‐strain accumulation across the fault is not significant at the...
Geochemistry and mineralogy of fumarolic deposits, Valley of Ten Thousand Smokes, Alaska: Bulk chemical and mineralogical evolution of dacite-rich protolith
J. J. Papike, T. E. C. Keith, Michael N. Spilde, K. C. Galbreath, C.K. Shearer, J.C. Laul
1991, American Mineralogist (76) 1662-1673
Samples from a fossil fumarole originating in the 1912 ash-flow tuffin the Valley of Ten Thousand Smokes have been analyzed to ascertain chemical changes resulting from high-temperature fumarolic alteration and subsequent cooling and weathering of the protolith. Samples of the underlying, dominantly leached, dacite-rich portion of the ash-flow tuff adjacent...
Major and trace element mass flux in fumarolic deposits, Valley of Ten Thousand Smokes, Alaska: Rhyolite-rich protolith
J. J. Papike, T. E. C. Keith, Michael N. Spilde, C.K. Shearer, K. C. Galbreath, J.C. Laul
1991, Geophysical Research Letters (18) 1545-1548
Three fossil fumaroles in rhyolite-rich ash-flow tuff from the lower Valley of Ten Thousand Smokes (VTTS) have been studied to ascertain chemical losses and gains and mineralogical evolution during fumarolic alteration and subsequent cooling and weathering processes. Major oxide and trace element data were interpreted using the isocon method of...
Seismic evidence for magma in the vicinity of Mt. Katmai, Alaska
Peter L. Ward, Andrew M. Pitt, Eliot Endo
1991, Geophysical Research Letters (18) 1537-1540
P-wave traveltime delays of as much as 0.9 sec are consistently observed at one seismic station from local and regional earthquakes 70 to 150 km deep. This station is on the southwest flank of Mt. Trident, the most recently active volcano within Katmai National Park, Alaska. Delays from local shallow...
Comment and Reply on "Seismic anisotropy due to preferred mineral orientation observed in shallow crustal rocks in southern Alaska"
Stuart Crampin, Thomas M. Brocher, Nikolas I. Christensen
1991, Geology (19) 859-860
No abstract available....
Seismic reflection/refraction mapping of faulting and regional dips in the eastern Alaska Range
Thomas M. Brocher, Warren J. Nokleberg, N.I. Christensen, William J. Lutter, Eric L. Geist, M. A. Fisher
1991, Journal of Geophysical Research B: Solid Earth (96) 10233-10249
We present the results of a Trans‐Alaska Crustal Transect (TACT) investigation of the upper 2–5 km of the eastern Alaska Range in the vicinity of the Denali fault based on seismic reflection/refraction data, laboratory measurements of rock velocities, and structural mapping. The Denali fault is a major dextral slip structure...
Comment and reply on "High-latitude application of 87Sr/86Sr: Correlation of Nuwok beds on North Slope, Alaska, to standard Oligocene chronostratigraphy"
Louie Marincovich Jr., Charles L. Powell II
1991, Geology (19) 537-539
No abstract available....
U–Pb geochronology of Late Cretaceous and early Tertiary plutons in the northern Coast Mountains batholith
G.E. Gehrels, W. C. McClelland, S.D. Sampson, Patchett P. Jonathan, David A. Brew
1991, Canadian Journal of Earth Sciences (28) 899-911
U–Pb geochronologic studies demonstrate that steeply dipping, sheetlike tonalitic plutons along the western margin of the northern Coast Mountains batholith were emplaced between ~83 and ~57 (perhaps ~55) Ma. Less elongate tonalitic–granodioritic bodies in central portions of the batholith yield ages of 59–58 Ma, coeval with younger phases of the tonalitic...
Evolution of sedimentary basins: North Slope Basin
1991, Bulletin 1990
No abstract available....
Taxonomic comments on the Dunlin (Calidris alpina) from northern Alaska and eastern Siberia
M.R. Browning
1991, Bulletin of the British Ornithologists' Club (111) 140-145
No abstract available....
Patterns of seabird and marine mammal carcass deposition along the central California coast, 1980-1986
James L. Bodkin, Ronald J. Jameson
1991, Canadian Journal of Zoology (69) 1149-1155
At monthly intervals from February 1980 through December 1986, a 14.5-km section of central California coastline was systematically surveyed for beach-cast carcasses of marine birds and mammals. Five hundred and fifty-four bird carcasses and 194 marine mammal carcasses were found. Common murres, western grebes, and Brandt's cormorants composed 45% of...
Isotopic and chemical constraints on the petrogenesis of Blackburn Hills volcanic field, western Alaska
E. J. Moll-Stalcup, Joseph G. Arth
1991, Geochimica et Cosmochimica Acta (55) 3753-3776
The Blackburn Hills volcanic field is one of several Late Cretaceous and early Tertiary (75–50 Ma) volcanic fields in western Alaska that comprise a vast magmatic province extending from the Arctic Circle to Bristol Bay. It consists of andesite flows, rhyolite domes, a central granodiorite to quartz monzonite pluton, and...
Erosion and accretion along the arctic coast of Alaska. The influence of ice and climate
Peter W. Barnes, Bonnie P. Rollyson
1991, Conference Paper, Coastal Sediments '91; Volume 2
Coastline comparison on 1951 and 1981 charts to determine erosion and accretion showed that ocean-facing coastal bluffs were retreating while deltas were rapidly expanding. Where the coast is fronted by a lagoon, and coast-parallel sand and gravel islands, bluff retreat was reduced. The extensive bluff erosion was volumetrically balanced by...
A geodetic network in the Novarupta area, Katmai National Park, Alaska
J.W. Kleinman, E.Y. Iwatsubo
1991, Geophysical Research Letters (18) 1517-1519
A small geodetic network was established in 1989 and 1990 to monitor ground deformation in the Novarupta area, Katmai National Park, Alaska. Slope distances and zenith angles for three lines were repeated in 1990. A comparison of the two surveys indicates changes that are within the...
The last interglaciation in Alaska: Stratigraphy and paleoecology of potential sites
T. D. Hamilton, J. Brigham-Grette
1991, Quaternary International (10-12) 49-71
At least 20 localities in Alaska contain deposits that may provide information on the last interglaciation (Oxygen-Isotope Substage 5e). These widely dispersed localities include river bluffs, coastal bluffs and terraces, elevated marine shorelines, lake basins, and artificial excavations. Most of the inferred interglacial deposits contain macrofossils or pollen that are...
Isotopic evidence for early Proterozoic age of the Idono Complex, west-central Alaska
Marti L. Miller, J.Y. Bradshaw, D.L. Kimbrough, T. W. Stern, T. K. Bundtzen
1991, Journal of Geology (99) 209-223
The Idono Complex of west-central Alaska is a fault-bounded, fragment of Early Proterozoic continental crust surrounded by overlap assemblages and younger terranes accreted in Mesozoic time. It is composed of granitic to dioritic orthogneiss, amphibolite, and metasedimentary rocks. Trace...
Apparatus for precise regulation and chilling of water temperatures in laboratory studies
D.B. Wangaard, John P. McDonell, Carl V. Burger, R.L. Wilmot
1991, Progressive Fish-Culturist (53) 251-255
Laboratory simulation of water temperature regimes that occur in subarctic rivers through winter necessitates the ability to maintain near‐freezing conditions. A heat‐exchanging apparatus is described that provided a convenient means of simulating the range of temperatures (0.5–12°C) that incubating eggs of salmon (Oncorhynchus spp.) typically experience in south‐central Alaskan watersheds. The...
Evolution of deep structure along the trans-Alaska crustal transect, Chugach Mountains and Copper River Basin, southern Alaska
G. S. Fuis, George Plafker
1991, Journal of Geophysical Research (96) 4229-4253
One of the most important results of the Trans-Alaska Crustal Transect investigations is the discovery that more than one third of the North American plate in southern Alaska (Chugach Mountains and Copper River basin) consists of tectonically underplated oceanic lithosphere. In southern Alaska, exposed accreted...
Observations on habitat use, breeding chronology and parental care in Bristle-thighed Curlews on the Seward Peninsula, Alaska
Robert E. Gill Jr., Richard B. Lanctot, J.D. Mason, Colleen M. Handel
1991, Wader Study Group Bulletin (61) 23-36
Results from an intensive survey in 1989 of one of the two known breeding localities of Bristle-thighed Curlews Numenius tahitiensis are reported. During the pre-nesting period birds confined most of their activity to two vegetation communities: shrub meadow tundra and low shrub/tussock tundra. During nesting more than half the Curlews...
The ecological and evolutionary consequences of body size: Introductory remarks
John F. Piatt
Ben D. Bell, R.O. Cossee, J.E.C. Flux, B.D. Heather, R.A. Hitchmough, C.J.R. Robertson, M.J. Williams, editor(s)
1991, Conference Paper, Proceedings: 20th international ornithological congress
No abstract available....
How do foraging seabirds sample their environment?
G.L. Hunt Jr., John F. Piatt, Kjell Einar Erikstad
Ben D. Bell, R.O. Cossee, J.E.C. Flux, B.D. Heather, R.A. Hitchmough, C.J.R. Robertson, M.J. Williams, editor(s)
1991, Conference Paper, Proceedings: 20th international ornithological congress
No abstract available....
Birds of the Kilbuck and Ahklun mountain region, Alaska
Margaret R. Petersen, Douglas N. Weir, Matthew H. Dick
1991, Report
Between 1952 and 1988, we studied the abundance, distribution, occurrence, and habitats used by birds in the northwest portion of Bristol Bay and the adjacent Kilbuck and Ahklun mountains. In the 809 days we were present, we conducted 53 studies or surveys of birds in the region. We gathered...
Effects of oil pollution on marine bird populations
John F. Piatt, Harry R. Carter, David N. Nettleship
Jan White, editor(s)
1991, Conference Paper, The effects of oil on wildlife: Research, rehabilitation, and general concerns; Proceedings from the oil symposium, Herndon, Virginia, October 16-18, 1990
Worldwide oil pollution has killed millions of marine birds in this century but it has been difficult to directly link these losses to population declines. Estimated bird losses from acute spills and chronic pollution are not precise because we usually do not know the proportion of birds killed at sea...
