Minimum age of the Neoproterozoic Seven Hundred Acre Island Formation and the tectonic setting of the Islesboro Formation, Islesboro block, Maine
David B. Stewart, Robert D Tucker, Robert Ayuso, Daniel R. Lux
2001, Atlantic Geology (37) 41-59
Two plat formal stratigraphic sequences occur on Islesboro, Penobscot Bay, Maine. The older Seven Hundred Acre Island Formation is at least 200 m thick, its base is not exposed, and it makes up fault-bounded blocks of siliceous colour-banded dolomitic marble, muscovite-rich quartzite, coarse-grained splendent muscovite-garnet-staurolite-andalusite schist, and calcareous metapelite, with...
Atrazine retention and degradation in the vadose zone at a till plain site in central Indiana
E.R. Bayless
2001, Ground Water (39) 169-180
The vadose zone was examined as an environmental compartment where significant quantities of atrazine and its degradation compounds may be stored and transformed. The vadose zone was targeted because regional studies in the White River Basin indicated a large discrepancy between the mass of atrazine applied to fields and the...
Implications of SHRIMP and microstructural data on the age and kinematics of shearing in the Asir terrane, southern Arabian Shield, Saudi Arabia
P.R. Johnson, F.H. Kattan, J. L. Wooden
2001, Gondwana Research (4) 172-173
The Asir terrane consists of north-trending belts of variably metamorphosed volcanic, sedimentary, and plutonic rocks that are cut by numerous shear zones (Fig. 1). Previous workers interpreted the shear zones as sutures, structures that modify earlier sutures, or structures that define the margins of...
Carbon isotope systematics and CO2 sources in The Geysers-Clear Lake region, northern California, USA
D. Bergfeld, F. Goff, C. J. Janik
2001, Geothermics (30) 303-331
Carbon isotope analyses of calcite veins, organic carbon, CO2 and CH4 from 96 rock and 46 gas samples show that metamorphic calcite veins and disseminated, organically-derived carbon from Franciscan Complex and Great Valley Sequence rocks have provided a primary carbon source for geothermal fluids during past and present hydrothermal activity...
The Precambrian terranes of Yemen and their correlation with those of Saudi Arabia and Somalia: Implications for the accretion of Gondwana
B.F. Windley, M.J. Whitehouse, D. B. Stoeser, S. Al-Khirbash, M. A. O. Ba-Bttat, A. Al-Ghotbah
2001, Gondwana Research (4) 206-207
Most of the basement of Yemen consists of early Precambrian continental high-grade terranes and Neoproterozoic low-grade island arcs that were accreted together to form an arc-continent collage during the Pan-African orogeny (Windley et al., 1996; Whitehouse et al., 1998; Whitehouse et al., in press)....
Occurrence of cyanazine compounds in groundwater: Degradates more prevalent than the parent compound
D.W. Kolpin, E.M. Thurman, S. M. Linhart
2001, Environmental Science & Technology (35) 1217-1222
A recently developed analytical method using liquid chromatography/mass spectrometry was used to investigate the occurrence of cyanazine and its degradates cyanazine acid (CAC), cyanazine amide (CAM), deethylcyanazine (DEC), and deethylcyanazine acid (DCAC) in groundwater. This research represents some of the earliest data on the occurrence of cyanazine degradates in groundwater....
Improving the quality of mass produced maps
Jeffrey D. Simley
2001, Cartography and Geographic Information Science (28) 97-110
Quality is critical in cartography because key decisions are often made based on the information the map communicates. The mass production of digital cartographic information to support geographic information science has now added a new dimension to the problem of cartographic quality, as problems once limited to small volumes can...
Occurrence and Diversity of Tetracycline Resistance Genes in Lagoons and Groundwater Underlying Two Swine Production Facilities
J. C. Chee-Sanford, R.I. Aminov, I.J. Krapac, N. Garrigues-Jeanjean, R.I. Mackie
2001, Applied and Environmental Microbiology (67) 1494-1502
In this study, we used PCR typing methods to assess the presence of tetracycline resistance determinants conferring ribosomal protection in waste lagoons and in groundwater underlying two swine farms. All eight classes of genes encoding this mechanism of resistance [tet(O), tet(Q), tet(W), tet(M), tetB(P), tet(S), tet(T), and otrA] were found...
Sediment quality in Burlington Harbor, Lake Champlain, U.S.A.
E.M. Lacey, J.W. King, J.G. Quinn, E.L. Mecray, P.G. Appleby, A.S. Hunt
2001, Water, Air, & Soil Pollution (126) 97-120
Surface samples and cores were collected in 1993 from the Burlington Harbor region of Lake Champlain. Sediment samples were analyzed for trace metals (cadmium, copper, lead, nickel, silver and zinc), simultaneously extracted metal/acid volatile sulfide (SEM-AVS), grain size, nutrients (carbon and nitrogen) and organic contaminants (polycyclic aromatic hydrocarbons (PAHs) and...
Effects of acidic recharge on groundwater at the St. Kevin Gulch site, Leadville, Colorado
S.S. Paschke, W.J. Harrison, K. Walton-Day
2001, Geochemistry: Exploration, Environment, Analysis (1) 3-14
The acid rock drainage-affected stream of St. Kevin Gulch recharges the Quaternary sand and gravel aquifer of Tennessee Park, near Leadville, Colorado, lowering pH and contributing iron, cadmium, copper, zinc and sulphate to the ground-water system. Dissolved metal mobility is controlled by the seasonal spring runoff as well as oxidation/reduction...
Associations of grassland birds with landscape factors in southern Wisconsin
Christine Ribic, D. W. Sample
2001, American Midland Naturalist (146) 105-121
We investigated the association of grassland birds with field- and landscape-level habitat variables in south-central Wisconsin during 1985–1987. Landscape-level variables were measured and digitized at 200, 400 and 800 m from the perimeter of 38 200 m × 100 m strip transects. A mixture of field and landscape variables was...
Debris-flow generation from recently burned watersheds
S.H. Cannon
2001, Environmental & Engineering Geoscience (7) 321-341
Evaluation of the erosional response of 95 recently burned drainage basins in Colorado, New Mexico and southern California to storm rainfall provides information on the conditions that result in fire-related debris flows. Debris flows were produced from only 37 of 95 (~40 percent) basins examined; the remaining basins produced either...
Mountains on Io: High-resolution Galileo observations, initial interpretations, and formation models
Elizabeth P. Turtle, Windy L. Jaeger, Laszlo P. Keszthelyi, Alfred S. McEwen, Moses P. Milazzo, Jeff Moore, Cynthia B. Phillips, Jani Radebaugh, Damon P. Simonelli, Peter Schuster, Galileo SSI Team
2001, Journal of Geophysical Research E: Planets (106) 33175-33199
During three close flybys in late 1999 and early 2000 the Galileo spacecraft acquired new observations of the mountains that tower above Io's surface. These images have revealed surprising variety in the mountains' morphologies. They range from jagged peaks several kilometers high to lower, rounded structures. Some are very smooth,...
Factors controlling navigation-channel Shoaling in Laguna Madre, Texas
R.A. Morton, R.C. Nava, M. Arhelger
2001, Journal of Waterway, Port, Coastal and Ocean Engineering (127) 72-81
Shoaling in the Gulf Intracoastal Waterway of Laguna Madre, Tex., is caused primarily by recycling of dredged sediments. Sediment recycling, which is controlled by water depth and location with respect to the predominant wind-driven currents, is minimal where dredged material is placed on tidal flats that are either flooded infrequently...
The Upper Pennsylvanian Pittsburgh coal bed: Resources and mine models
W.D. Watson, L.F. Ruppert, S.J. Tewalt, L. J. Bragg
2001, Natural Resources Research (10) 21-34
The U.S. Geological Survey recently completed a digital coal resource assessment model of the Upper Pennsylvanian Pittsburgh coal bed, which indicates that after subtracting mined-out coal, 16 billion short tons (14 billion tonnes) remain of the original 34 billion short tons (31 billion tonnes) of coal. When technical, environmental, and...
Demonstration and Field Evaluation of Streambank Stabilization with Submerged Vanes
H. Whitman, J. Hoopes, D. Poggi, F. Fitzpatrick, K. Walz
Hayes D.F.Hayes D.F., editor(s)
2001, Conference Paper, Proceedings of the 2001 Wetlands Engineering and River Restoration Conference
The effectiveness of submerged vanes for reducing bank erosion and improving aquatic habitat is being evaluated at a site on North Fish Creek, a Lake Superior tributary. Increased runoff from agricultural areas with clayey soils has increased flood magnitudes and the erosion potential/transport capacity of the stream. Most of the...
Slip distribution and tectonic implication of the 1999 Chi-Chi, Taiwan, earthquake
C. Ji, D.V. Helmberger, T.-R.A. Song, K.-F. Ma, D.J. Wald
2001, Geophysical Research Letters (28) 4379-4382
We report on the fault complexity of the large (Mw = 7.6) Chi-Chi earthquake obtained by inverting densely and well-distributed static measurements consisting of 119 GPS and 23 doubly integrated strong motion records. We show that the slip of the Chi-Chi earthquake was concentrated on the surface of a "wedge...
Estimating methane production rates in bogs and landfills by deuterium enrichment of pore water
D. I. Siegel, J. P. Chanton, P.H. Glaser, L.S. Chasar, D.O. Rosenberry
2001, Global Biogeochemical Cycles (15) 967-975
Raised bogs and municipal waste landfills harbor large populations of methanogens within their domed deposits of anoxic organic matter. Although the methane emissions from these sites have been estimated by various methods, limited data exist on the activity of the methanogens at depth. We therefore analyzed the stable isotopic signature...
New constraints on the pyroclastic eruptive history of the Campanian volcanic Plain (Italy)
B. de Vivo, G. Rolandi, P. B. Gans, A. Calvert, W.A. Bohrson, F. J. Spera, H. E. Belkin
2001, Mineralogy and Petrology (73) 47-65
The ∼ 150 km3 (DRE) trachytic Campanian Ignimbrite, which is situated north-west of Naples, Italy, is one of the largest eruptions in the Mediterranean region in the last 200 ky. Despite centuries of investigation, the age and eruptive history of the Campanian Ignimbrite is still debated, as is the chronology of other significant volcanic...
New general pore size distribution model by classical thermodynamics application: Activated carbon
M. Lordgooei, M.J. Rood, M. Rostam-Abadi
2001, Journal of Environmental Engineering (127) 281-287
A model is developed using classical thermodynamics to characterize pore size distributions (PSDs) of materials containing micropores and mesopores. The thermal equation of equilibrium adsorption (TEEA) is used to provide thermodynamic properties and relate the relative pore filling pressure of vapors to the characteristic pore energies of the adsorbent/adsorbate system...
Olivine-liquid relations of lava erupted by Kilauea volcano from 1994 to 1998: Implications for shallow magmatic processes associated with the ongoing east-rift-zone eruption
Carl R. Thornber
2001, Canadian Mineralogist (39) 239-266
From 1994 through 1998, the eruption of Kîlauea, in Hawai’i, was dominated by steady-state effusion at Pu‘u ‘Ô‘ô that was briefly disrupted by an eruption 4 km uprift at Nāpau Crater on January 30, 1997. In this paper, I describe the systematic relations of whole-rock, glass, olivine, and olivine-inclusion compositions...
Widespread potential for microbial MTBE degradation in surface-water sediments
P. M. Bradley, J. E. Landmeyer, F. H. Chapelle
2001, Environmental Science & Technology (35) 658-662
Microorganisms indigenous to stream and lake bed sediments, collected from 11 sites throughout the United States, demonstrated significant mineralization of the fuel oxygenate, methyl-tert-butyl ether (MTBE). Mineralization of [U-14C]MTBE to 14CO2 ranged from 15 to 66% over 50 days and did not differ significantly between sediments collected from MTBE contaminated...
Paleoclimate and Amerindians: Evidence from stable isotopes and atmospheric circulation
M.B. Lovvorn, G.C. Frison, L.L. Tieszen
2001, Proceedings of the National Academy of Sciences of the United States of America (98) 2485-2490
Two Amerindian demographic shifts are attributed to climate change in the northwest plains of North America: at ???11,000 calendar years before present (yr BP), Amerindian culture apparently split into foothills-mountains vs. plains biomes; and from 8,000-5,000 yr BP, scarce archaeological sites on the open plains suggest emigration during xeric "Altithermal"...
Remote sensing education and Internet/World Wide Web technology
J. A. Griffith, S.L. Egbert
2001, Canadian Journal of Remote Sensing (27) 159-168
Remote sensing education is increasingly in demand across academic and professional disciplines. Meanwhile, Internet technology and the World Wide Web (WWW) are being more frequently employed as teaching tools in remote sensing and other disciplines. The current wealth of information on the Internet and World Wide Web must be distilled,...
Transient storage assessments of dye-tracer injections in rivers of the Willamette Basin, Oregon
A. Laenen, K.E. Bencala
2001, Journal of the American Water Resources Association (37) 367-377
Rhodamine WT dye-tracer injections in rivers of the Willamette Basin yield concentration-time curves with characteristically long recession times suggestive of active transient storage processes. The scale of drainage areas contributing to the stream reaches studied in the Willamette Basin ranges from 10 to 12,000 km2. A transient storage assessment of...
