A mid-Permian chert event: Widespread deposition of biogenic siliceous sediments in coastal, island arc and oceanic basins
B.L. Murchey, D. L. Jones
1992, Palaeogeography, Palaeoclimatology, Palaeoecology (96) 161-174
Radiolarian and conodont of Permian siliceous rocks from twenty-three areas in teh the circum-Pacific and Mediterranean regions reveal a widespread Permian Chert Event during the middle Leonardian to Wordian. Radiolarian- and (or) sponge spicule-rich siliceous sediments accumulated beneath high productivity zones in coastal, island arc and oceanic basins. Most of...
Application of continuum models to deformation of the Aleutian Island Arc
Eric L. Geist, David W. Scholl
1992, Journal of Geophysical Research Solid Earth (97) 4953-4967
Continuum models were constructed to describe large‐scale deformation of the Aleutian Island Arc over the past 5 m.y. These models consider the island arc as a continuum in the horizontal plane with the velocity boundary condition at the Pacific edge stated as a fraction of Pacific plate convergence transferred to...
Thin, low‐velocity crust beneath the southern Yukon‐Tanana Terrane, east central Alaska: Results from Trans‐Alaska crustal transect refraction/wide‐angle reflection data
Bruce C. Beaudoin, Gary S. Fuis, Walter D. Mooney, Warren J. Nokleberg, Nikolas I. Christensen
1992, Journal of Geophysical Research B: Solid Earth (97) 1921-1942
A seismic refraction/wide‐angle reflection survey for the Trans‐Alaska Crustal Transect program reveals a thin, reflective crust beneath the southern Yukon‐Tanana terrane (YTT) in east central Alaska. These data are the first detailed refraction survey of the southern YTT and compose a 130‐km‐long reversed profile along the Alaska...
Evidence for cenozoic crustal extension in the Bering Sea region
Alan K. Cooper, M. S. Marlow, D.W. Scholl, A.J. Stevenson
1992, Tectonics (11) 719-731
Geophysical and regional geologic data provide evidence that parts of the oceanic crust in the abyssal basins of the Bering Sea have been created or altered by crustal extension and back‐arc spreading. These processes have occurred during and since early Eocene time when the Aleutian Ridge developed and isolated oceanic...
Geographic Variation in Hirundo pyrrhonota (Cliff Swallow) from Northern North America
M. Ralph Browning
1992, Western Birds (23) 21-29
The number of subspecies recognized in Hirundo pyrrhonota Vieillot (Cliff Swallow) from Alaska, Canada, and the northern contiguous United States ranges from one (Peters 1960) to three (e.g., Jewett et al. 1953, Oberholser, 1920, breeding from central Alaska to the central Great Basin, and two disjunct populations of nominate pyrrhonota,...
Earthquakes, May-June 1991
W. J. Person
1992, Earthquakes & Volcanoes (USGS) (23) 77-81
One major earthquake occurred during this reporting period. This was a magntidue 7.1 in Indonesia (Minahassa Peninsula) on June 20. Earthquake-related deaths were reported in the Western Caucasus (Georgia, USSR) on May 3 and June 15. One earthquake-related death was also reported El Salvador on June 21. In the United States,...
Change-in-ratio methods for estimating population size
Mark S. Udevitz, Kenneth H. Pollock
Dale R. McCullough, Reginald H. Barrett, editor(s)
1992, Book chapter, Wildlife 2001: Populations
Change-in-ratio (CIR) methods can provide an effective, low cost approach for estimating the size of wildlife populations. They rely on being able to observe changes in proportions of population subclasses that result from the removal of a known number of individuals from the population. These methods were first introduced in...
Earthquakes, September - October 1992
W. J. Person
1992, Earthquakes & Volcanoes (USGS) (23) 280-287
This reporting period was very active in terms of earthquake occurrence; there were six major earthquakes (7.0≤M<8.0) during the second half of october. Earthquake-related deaths were reported in Iran, Nicaragua, Egypt, Colombia, Morocco, Zaire, and the Republic of Georgia. In the United States, a damaging earthquake occurred in Utah on Septmber...
Lower Cretaceous smarl turbidites of the Argo Abyssal Plain, Indian Ocean
Julie A. Dumoulin
Sondra K. Stewart, Diana Kennett, Elsa K. Mazzullo, editor(s)
1992, Proceedings of the Ocean Drilling Program: Scientific Results 123-5
Sediments recovered during Ocean Drilling Program (ODP) Leg 123 from the Argo Abyssal Plain (AAP) consist largely of turbidites derived from the adjacent Australian continental margin. The oldest abundant turbidites are Valanginian-Aptian in age and have a mixed (smarl) composition; they contain subequal amounts of calcareous and siliceous biogenic components,...
Reconnaissance exploration geochemistry in the central Brooks Range, northern Alaska: Implications for exploration of sediment-hosted zinc-lead-silver deposits
K.D. Kelley, D. L. Kelley
1992, Journal of Geochemical Exploration (42) 273-300
A reconnaissance geochemical survey was conducted in the southern Killik River quadrangle, central Brooks Range, northern Alaska. The Brooks Range lies within the zone of continuous permafrost which may partially inhibit chemical weathering and oxidation. The minus 30-mesh and nonmagnetic heavy-mineral...
Petrogenesis of the Pd-rich intrusion at Salt Chuck, Prince of Wales island: an early Paleozoic Alaskan-type ultramafic body
R. A. Loney, G. R. Himmelberg
1992, Canadian Mineralogist (30) 1005-1022
The early Paleozoic Salt Chuck intrusion has petrographic and chemical characteristics that are similar to those of Cretaceous Alaskan-type ultramafic-mafic bodies. The intrusion is markedly discordant to the structure of the early Paleozoic Descon Formation, in which it has produced a rather indistinct contact aureole a few meters wide. Mineral...
Survival of cackling Canada geese, 1982-1988
Dennis G. Raveling, James D. Nichols, James E. Hines, David S. Zezulak, Joseph G. Silveira, James C. Johnson, Thomas W. Aldrich, John A. Weldon
1992, Journal of Wildlife Management (56) 63-73
We estimated seasonal and annual survival rates of cackling Canada geese (Branta canadensis minima) for the period 1982-1989 to identify periods of high mortality and assess effects of harvest management decisions. We tested hypotheses about age- and sex specific variation in survival, seasonal variation in survival rates, and variation in...
Molt frequency and size class distribution in the California spiny lobster (Panulirus interruptus), at San Nicolas Island, California
James L. Bodkin, L.B. Browne
1992, California Fish and Game (78) 136-144
The timing of wing molt in tundra swans: energetic and non-energetic constraints
S.L. Earnst
1992, Condor (94) 847-856
Date of wing molt initiation, based on the regression of tenth primary length on capture date, was calculated for breeding and nonbreeding Tundra Swans (Cygnus columbianus columbianus) on the Colville River Delta, Alaska. Breeding females initiated wing molt significantly later than breeding males and nonbreeding males and females; the molt...
Toxic elements and organochlorines in harbor seals (Phoca vitulina richardsi), Kodiak, Alaska, USA
A. Keith Miles, Donald Calkins, Nancy C. Coon
1992, Bulletin of Environmental Contamination and Toxicology (48) 727-732
No abstract available....
Volcanoes of Alaska: Kupreanof (Stepovak Bay)
Frederic H. Wilson
Charles A. Wood, Juergen Kienle, editor(s)
1992, Book chapter, Volcanoes of North America: United States and Canada
No abstract available....
Intraspecific mitochondrial DNA variation in North American cervids
M. A. Cronin
1992, Journal of Mammalogy (73) 70-82
Intraspecific variation in mitochondrial DNA of North American cervids was assessed with restriction enzymes to determine relationships among populations and subspecies. No variation was detected in moose (Alces alces) and little in elk (Cervus elaphus). Caribou (Rangifer tarandus), white-tailed deer (Odocoileus virginianus), and mule deer (Odocoileus hemionus) possessed considerable...
Depositional history, nannofossil biostratigraphy, and correlation of Argo Abyssal Plain Sites 765 and 261
Julie A. Dumoulin, Paul R. Bown
Sondra K. Stewart, Diana Kennett, Elsa K. Mazzullo, editor(s)
1992, Proceedings of the Ocean Drilling Program: Scientific Results 123-1
Sediments from the Argo Abyssal Plain (AAP), northwest of Australia, are the oldest known from the Indian Ocean and were recovered from ODP Site 765 and DSDP Site 261. New biostratigraphic and sedimentologic data from these sites, as well as reinterpretations of earlier findings, indicate that basal sediments at both...
Determining baselines and variability of elements in plants and soils near the Kenai National Wildlife Refuge, Alaska
J.G. Crock, R. C. Severson, L. P. Gough
1992, Water, Air, & Soil Pollution (63) 253-271
Recent investigations on the Kenai Peninsula had two major objectives: (1) to establish elemental baseline concentrations ranges for native vegetation and soils; and, (2) to determine the sampling density required for preparing stable regional geochemical maps for various elements in native plants and soils. These objectives were accomplished using an...
Distribution and characteristics of metamorphic belts in the south-eastern Alaska part of the North American Cordillera
D. A. Brew, G. R. Himmelberg, R. A. Loney, A. B. Ford
1992, Journal of Metamorphic Geology (10) 465-482
The Cordilleran orogen in south-eastern Alaska includes 14 distinct metamorphic belts that make up three major metamorphic complexes, from east to west: the Coast plutonic–metamorphic complex in the Coast Mountains; the Glacier Bay–Chichagof plutonic–metamorphic complex in the central part of the Alexander Archipelago; and the Chugach plutonic–metamorphic complex in the...
Suspension freezing of bottom sediment and biota in the Northwest Passage and implications for Arctic Ocean sedimentation
E. Reimnitz, L. Marincovich Jr., M. McCormick, W.M. Briggs
1992, Canadian Journal of Earth Sciences (29) 693-703
Ice observations and sediment collected in a summer transit through the Northwest Passage provide insights on suspension freezing, the most important sediment entrainment mechanism for the Arctic Ocean. No evidence was seen for entrainment by bottom adfreezing, bluff slumping, river flooding, dragging ice keels, or significant eolian transport from land...
Variation of rock-forming metals in sub-annual increments of modern Greenland snow
T. K. Hinkley
1992, Atmospheric Environment - Part A General Topics (26 A) 2283-2293
Modern snowpack from central south Greenland was sampled in sub-seasonal increments and analysed for a suite of major, minor and trace rock-forming metals (K, Rb, Cs, Ca, Sr, Ba). There is a sharp seasonal concentration maximum for all six metals that comes in summer, later than mid-June. Metal concentrations in...
Impact origin of the Avak Structure, Arctic Alaska, and genesis of the Barrow gas fields
C.E. Kirschner, Arthur Grantz, M. W. Mullen
1992, American Association of Petroleum Geologists Bulletin (76) 651-679
Geophysical and subsurface geologic data suggest that the Avak structure, which underlies the Arctic Coastal Plain 12 km southeast of Barrow, Alaska, is a hypervelocity meteorite or comet impact structure. The structure is a roughly circular area of uplifted, chaotically deformed Upper Triassic to Lower Cretaceous sedimentary rocks 8 km...
A comparison of gas geochemistry of fumaroles in the 1912 ash-flow sheet and on active stratovolcanoes, Katmai National Park, Alaska
D.S. Sheppard, C. J. Janik, T. E. C. Keith
1992, Journal of Volcanology and Geothermal Research (53) 185-197
Fumarolic gas samples collected in 1978 and 1979 from the stratovolcanoes Mount Griggs, Mount Mageik, and the 1953-68 SW Trident cone in Katmai National Park, Alaska, have been analysed and the results presented here. Comparison with recalculated analyses of samples collected from the Valley of Ten Thousand Smokes (VTTS) in...
Geochemistry of waters in the Valley of Ten Thousand Smokes region, Alaska
T. E. C. Keith, J. M. Thompson, R. A. Hutchinson, L. D. White
1992, Journal of Volcanology and Geothermal Research (49) 209-231
Meteoric waters from cold springs and streams outside of the 1912 eruptive deposits filling the Valley of Ten Thousand Smokes (VTTS) and in the upper parts of the two major rivers draining the 1912 deposits have similar chemical trends. Thermal springs issue in the mid-valley area along a 300-m lateral...
