Boron isotope systematics of tourmaline formation in the Sullivan Pb-Zn-Ag deposit, British Columbia, Canada
S.-Y. Jiang, M. R. Palmer, J. F. Slack, D.R. Shaw
1999, Chemical Geology (158) 131-144
We report here the results of 54 boron isotope analyses of tourmaline associated with the giant Sullivan Pb-Zn-Ag deposit in southeastern British Columbia, Canada. The ??11B values range from -11.1 to -2.9???, which is almost as great as the range found worldwide in tourmalines from 33 massive sulfide deposits and...
Results of repeated leveling surveys at Newberry Volcano, Oregon, and near Lassen Peak Volcano, California
D. Dzurisin
1999, Bulletin of Volcanology (61) 83-91
Personnel from the U.S. Geological Survey's Cascades Volcano Observatory conducted first-order, class-II leveling surveys near Lassen Peak, California, in 1991 and at Newberry Volcano, Oregon, in 1985, 1986, and 1994. Near Lassen Peak no significant vertical displacements had occurred along either of two traverses, 33 and 44 km long, since...
Nesting habitat of least terns (Sterna antillarum athalassos) on an inland alkaline flat
Sara H. Schweitzer, David M. Leslie Jr.
1999, American Midland Naturalist (142) 173-180
We measured habitat characteristics in colony sites and at nest sites of endangered least terns (Sterna antillarum athalassos) on an expansive alkaline flat at Salt Plains National Wildlife Refuge, Oklahoma, in 1992 and 1993. Least terns nested in 12 colony sites on the alkaline flat during 1992 and 1993....
The importance of SAR wavelength in penetrating blow sand in Northern Arizona
G. G. Schaber, C. S. Breed
1999, Remote Sensing of Environment (69) 87-104
Multifrequency and polarimetric Airborne Synthetic Aperture Radar (AIRSAR) images of a sand streak in northern Arizona demonstrate the ability of C- (6-cm wavelength), L- (24 cm), and P-band (68 cm) radar signals to backscatter, respectively, from increasingly greater depths reaching 2 m or more in active blow sand. The studied...
Molybdenum accumulation in Cariaco basin sediment over the past 24 k.y.: A record of water-column anoxia and climate
W.E. Dean, D.Z. Piper, L.C. Peterson
1999, Geology (27) 507-510
Molybdenum (Mo) concentrations in a sediment core from the Cariaco basin on the Venezuelan continental shelf can be partitioned between a marine fraction and a terrigenous fraction. The accumulation rate of the marine fraction of Mo increased abruptly 15 000 calendar years ago...
Time of day of ovulation by three duck species in subarctic Alaska
Daniel Esler
1999, Condor (101) 422-425
I examined variation in ovulation times of Northern Pintails (Anas acuta), American Wigeon (A. americana), and Lesser Scaup (Aythya affinis) breeding in subarctic Alaskan wetlands. Ovulation times and, by extension, egg-laying times were highly variable in all three species, with ovulations occurring during all hours of the day. Only Lesser...
XAFS measurements on zinc chloride aqueous solutions from ambient to supercritical conditions using the diamond anvil cell
Robert A. Mayanovic, Alan J. Anderson, William A. Bassett, I.-M. Chou
1999, Journal of Synchrotron Radiation (6) 195-197
The structure and bonding properties of metal complexes in subcritical and supercritical fluids are still largely unknown. Conventional high pressure and temperature cell designs impose considerable limitations on the pressure, temperature, and concentration of metal salts required for measurements on solutions under supercritical conditions. In this study, we demonstrate the...
Forced copulation results in few extrapair fertilizations in Ross's and lesser snow geese
P.O. Dunn, A. D. Afton, M.L. Gloutney, R.T. Alisauskas
1999, Animal Behaviour (57) 1071-1081
Extrapair paternity varies from 0 to over 70% of young among various populations of birds. Comparative studies have suggested that this variation is related to nesting density, breeding synchrony and the proportion of extrapair copulations. We used minisatellite DNA fingerprinting to examine levels of extrapair paternity in Ross's geese, Chen...
Comparison of the stable-isotopic composition of soil water collected from suction lysimeters, wick samplers, and cores in a sandy unsaturated zone
M.K. Landon, G. N. Delin, S.C. Komor, C.P. Regan
1999, Journal of Hydrology (224) 45-54
Soil water collected from suction lysimeters and wick samplers buried in the unsaturated zone of a sand and gravel aquifer and extracted from soil cores were analyzed for stable oxygen and hydrogen isotope values. Soil water isotopic values differed among the three sampling methods in most cases. However, because each...
Sequential filling of a late paleozoic foreland basin
J. C. Mars’, W.A. Thomas
1999, Journal of Sedimentary Research (69) 1191-1208
Through the use of an extensive data base of geophysical well logs, parasequence-scale subdivisions within a late Paleozoic synorogenic clastic wedge resolve cycles of sequential subsidence of a foreland basin, sediment progradation, subsidence of a carbonate shelf edge, diachronously subsiding discrete depositional centers,...
An example of neotectonism in a continental interior - Thebes Gap, Midcontinent, United States
R.W. Harrison, D. Hoffman, J.D. Vaughn, J. R. Palmer, C.L. Wiscombe, J. P. McGeehin, W. J. Stephenson, J. K. Odum, R. A. Williams, S.L. Forman
1999, Tectonophysics (305) 399-417
Some of the most intense neotectonic activity known in the continental interior of North America has been recently discovered on a fault zone in the Thebes Gap area, Missouri and Illinois. This faulting almost assuredly was accompanied by large earthquakes. The zone is located approximately 30 km north of the...
Volcano-tectonic structures, gravity and helium in geothermal areas of Tuscany and Latium (Vulsini volcanic district), Italy
Filippo M. Di, S. Lombardi, G. Nappi, G.M. Reimer, A. Renzulli, B. Toro
1999, Geothermics (28) 377-393
Since the early 1980s, geological and structural mapping, gravity, and helium soil-gas studies have been performed in the eastern sector of the Vulsini Volcanic District (Roman Magmatic Province) in an attempt to locate potential geothermal reservoirs. This area is characterised by an anomalous geothermal gradient of > 100??C/km, and by...
Diversifying natural resources value measurements: The Trinity River study
J. G. Taylor, A. J. Douglas
1999, Society and Natural Resources (12) 315-336
An interdisciplinary team set out to establish the economic and social values of the Trinity River in northern California . This information was intended to support the Secretary of the Interior's decision on allocation of Trinity River flows . This team set out to measure the values of Trinity River...
Distribution and diurnal behavior of Steller's Eiders wintering on the Alaska Peninsula
M.K. Laubhan, K.A. Metzner
1999, Condor (101) 694-698
We studied the distribution and activities of adult Steller's Eiders (Polysticta stelleri) during winter and spring on a deep-water embayment and a shallow lagoon along the Alaska Peninsula from September 1980 to May 1981. During the remigial molt, eiders were observed on Izembek Lagoon but not on Cold Bay. Following...
The role of disseminated calcite in the chemical weathering of granitoid rocks
A. F. White, T.D. Bullen, D.V. Vivit, M. S. Schulz, D. W. Clow
1999, Geochimica et Cosmochimica Acta (63) 1939-1953
Accessory calcite, present at concentrations between 300 and 3000 mg kg-1, occurs in fresh granitoid rocks sampled from the Merced watershed in Yosemite National Park, CA, USA; Loch Vale in Rocky Mountain National Park CO USA; the Panola watershed, GA USA; and the Rio Icacos, Puerto Rico. Calcite occurs as...
Estimating lake-atmosphere CO2 exchange
D.E. Anderson, Robert G. Striegl, D.I. Stannard, C.M. Michmerhuizen, T.A. McConnaughey, J. W. LaBaugh
1999, Limnology and Oceanography (44) 988-1001
Lake‐atmosphere CO2 flux was directly measured above a small, woodland lake using the eddy covariance technique and compared with fluxes deduced from changes in measured lake‐water CO2 storage and with flux predictions from boundary‐layer and surface‐renewal models. Over a 3‐yr period, lake‐atmosphere exchanges of CO2 were measured over 5 weeks...
No spreading across the southern Juan de Fuca ridge axial cleft during 1994-1996
C.D. Chadwell, J. A. Hildebrand, Fred N. Spiess, J. L. Morton, W. R. Normark, C.A. Reiss
1999, Geophysical Research Letters (26) 2525-2528
Direct-path acoustic measurements between seafloor transponders observed no significant extension (−10±14 mm/yr) from August 1994 to September 1996 at the southern Juan de Fuca Ridge (44°40′ N and 130°20′ W). The acoustic path for the measurement is a 691-m baseline straddling the axial cleft, which bounds...
Subdivision of Holocene Baltic sea sediments by their physical properties [Gliederung holozaner ostseesedimente nach physikalischen Eigenschaften]
Jan Harff, Geoffrey C. Bohling, R. Endler, J.C. Davis, Ricardo A. Olea
1999, Petermanns Geographische Mitteilungen (143) 50-55
The Holocene sediment sequence of a core taken within the centre of the Eastern Gotland Basin was subdivided into 12 lithostratigraphic units based on MSCL-data (sound velocity, wet bulk density, magnetic susceptibility) using a multivariate classification method. The lower 6 units embrace the sediments until the Litorina transgression, and the...
Active tectonics of the Seattle fault and central Puget sound, Washington - Implications for earthquake hazards
S. Y. Johnson, S. V. Dadisman, J.R. Childs, W. D. Stanley
1999, Geological Society of America Bulletin (111) 1042-1053
We use an extensive network of marine high-resolution and conventional industry seismic-reflection data to constrain the location, shallow structure, and displacement rates of the Seattle fault zone and crosscutting high-angle faults in the Puget Lowland of western Washington. Analysis of seismic profiles extending 50 km across the Puget Lowland from...
CFIRP: What we learned in the first ten years
C. L. Chambers, W.C. McComb, J. C. Tappeiner II, L.D. Kellogg, R.L. Johnson, G. Spycher
1999, Conference Paper, Forestry Chronicle
In response to public dissatisfaction with forest management methods, we initiated the College of Forestry Integrated Research Project (CFIRP) to test alternative silvicultural systems in Douglas-fir (Pseudotsuga menziesii stands in western Oregon. We compared costs and biological and human responses among a control and three replicated silvicultural alternatives to clearcutting...
Effectiveness of an existing estuarine no-take fish sanctuary within the Kennedy Space Center, Florida
D.R. Johnson, N.A. Funicelli, James A. Bohnsack
1999, North American Journal of Fisheries Management (19) 436-453
Approximately 22% of the waters of the Merritt Island National Wildlife Refuge, which encompasses the Kennedy Space Center, Florida, have been closed to public access and fishing since 1962. These closed areas offer an opportunity to test the effectiveness of “no-take” sanctuaries by analyzing two replicated estuarine areas. Areas open...
The significance of pre-existing, deeply weathered crystalline rock in interpreting the effects of glaciation in the Minnesota River valley, U.S.A.
C. J. Patterson, Terrence Boerboom
1999, Annals of Glaciology (28) 53-58
Minnesota is largely underlain by Precambrian crystalline bedrock that was weathered to an average depth of 30 m prior to Late Cretaceous time. The fresh-rock-weathered-rock interface is irregular, with as much as 45 m of relief. Weathering exploited joints, locally isolating meter-sized volumes of rock known as corestones. Variable amounts...
Annual minerals review
M.J. Potter
1999, American Ceramic Society Bulletin (78) 117-131
No abstract available....
Coupling groundwater and riparian vegetation models to assess effects of reservoir releases
Abraham E. Springer, Julie M. Wright, Patrick B. Shafroth, Juliet C. Stromberg, Duncan T. Patten
1999, Water Resources Research (35) 3621-3630
Although riparian areas in the arid southwestern United States are critical for maintaining species diversity, their extent and health have been declining since Euro‐American settlement. The purpose of this study was to develop a methodology to evaluate the potential for riparian vegetation restoration and groundwater recharge. A numerical groundwater flow...
Possible sand resources on the reef front around Oahu
M. A. Hampton, M.E. Torresan, F. L. Wong, C.S. Frazee
Ewing L.Magoon O.T.Robertson S.Ewing L.Magoon O.T.Robertson S., editor(s)
1999, Conference Paper, Sand Rights 1999 Bringing Back the Beaches
Large sediment deposits on the reef front around Oahu are a possible resource for replenishing eroded beaches. An overview is given on the collection of closely spaced, high-resolution subbottom profiles that clearly depict the deposits in three areas, namely, the Kailua Bay off the windward coast, Makua to Kahe Point...
