A field test of electromigration as a method for remediating sulfate from shallow ground water
C. G. Patterson, D.D. Runnells
1996, Ground Water Monitoring and Remediation (16) 63-68
Eloctromigraiion offers a potential tool for remediating ground water contaminated with highly soluble components, such as Na+, Cl, NO3 and SO4−. A field experiment was designed to lest the efficacy of electromigration for preconcontrating dissolved SO42 in ground water associated with a fossil-fuel power plant. Two shallow wells, 25 feel apart (one...
Sediment retention in a bottomland hardwood wetland in eastern Arkansas
B.A. Kleiss
1996, Wetlands (16) 321-333
One of the often-stated functions of wetlands is their ability to remove sediments and other particulates from water, thus improving water quality in the adjacent aquatic system. However, actual rates of suspended sediment removal have rarely been measured in freshwater wetland systems. To address this issue, suspended...
Development and evaluation of sediment quality guidelines for Florida coastal waters
Donald D. MacDonald, R. Scott Carr, Fred D. Calder, Edward R. Long, Christopher G. Ingersoll
1996, Ecotoxicology (5) 253-278
The weight-of-evidence approach to the development of sediment quality guidelines (SQGs) was modified to support the derivation of biological effects-based SQGs for Florida coastal waters. Numerical SQGs were derived for 34 substances, including nine trace metals, 13 individual polycyclic aromatic hydrocarbons (PAHs), three groups of PAHs, total polychlorinated biphenyls (PCBs),...
Nutrients in the Nation's Waters--Too Much of a Good Thing?
David K. Mueller, Dennis R. Helsel
1996, Circular 1136
Historical data on nutrients (nitrogen and phosphorus) from about 12,000 ground-water and more than 22,000 stream samples have been compiled and related to possible sources. This existing information was collected by many agencies for a variety of purposes. Therefore, though it can be used to determine where concentrations differ, the...
Proterozoic low-Ti iron-oxide deposits in New York and New Jersey: Relation to Fe-oxide (Cu–U–Au–rare earth element) deposits and tectonic implications: Comment and Reply
Craig A. Johnson, James McLelland, Michael P. Foose
1996, Geology (24) 475-477
No abstract available....
Influence of stretching and density contrasts on the chemical evolution of continental magmas: An example from the Ivrea-Verbano Zone
S. Sinigoi, J. E. Quick, A. Mayer, J. Budahn
1996, Contributions to Mineralogy and Petrology (123) 238-250
The southern Ivrea-Verbano Zone of the Italian Western Alps contains a huge mafic complex that intruded high-grade metamorphic rocks while they were resident in the lower crust. Geologic mapping and chemical variations of the igneous body were used to study the evolution of underplated crust. Slivers of crustal rocks (septa)...
Pliocene and early Pleistocene environments and climates of the western Snake River Plain, Idaho
Robert S. Thompson
1996, Marine Micropaleontology (27) 141-156
Sedimentological, palynological, and magnetic susceptibility data provide paleoenvironmental and paleoclimatic information from a 989 ft (301 m) core of sediments from the upper Glenns Ferry and Bruneau Formations from near the town of Bruneau in Owyhee County, Idaho. Chronology is based on stratigraphic position, paleomagnetism, and biostratigraphic data, which collectively...
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...
Age and character of basaltic rocks of the Yucca Mountain region, southern Nevada
R.J. Fleck, B. D. Turrin, D.A. Sawyer, R.G. Warren, D.E. Champion, M.R. Hudson, S.A. Minor
1996, Journal of Geophysical Research B: Solid Earth (101) 8205-8227
Volcanism in the Yucca Mountain region of southern Nevada in the last 5 m.y. is restricted to moderate-to-small volumes of subalkaline basaltic magmas, produced during at least 6 intervals, and spanning an age range from 4.6 Ma to about 125 ka. Where paleomagnetic evidence is available, the period of volcanism...
The origin of the Bering Sea basalt province, western Alaska
E. J. Moll-Stalcup
1996, Geology of the Pacific Ocean (12) 671-689
Bering Sea basalt province consists of at least 15 late Cenozoic (less than 6 Ma) volcanic fields that occur on islands in the Bering Sea and along the adjacent west coast of Alaska. The fields are composed of widespread flows of tholeiitic and alkali olivine basalt and small cones, flows,...
A glass spherule of questionable impact origin from the Apollo 15 landing site: Unique target mare basalt
G. Ryder, J.W. Delano, P.H. Warren, G.W. Kallemeyn, G. B. Dalrymple
1996, Geochimica et Cosmochimica Acta (60) 693-710
A 6 mm-diameter dark spherule, 15434,28, from the regolith on the Apennine Front at the Apollo 15 landing site has a homogeneous glass interior with a 200 ??m-thick rind of devitrified or crystallized melt. The rind contains abundant small fragments of Apollo 15 olivine-normative mare basalt and rare volcanic Apollo...
Characterizing coal beds in western Kentucky with the Al-La-Sc coherent triad
L.L. Chyi, J.H. Medlin
1996, International Journal of Coal Geology (30) 349-359
Cyclic sedimentation and lateral facies changes make coal bed correlations inconclusive and difficult. This uncertainty can be further complicated if a coal basin has been structurally deformed. Coal macerals can be studied to indicate the nature and degree of coalification. Their use in coal bed correlation, however, is limited. Most...
Porphyry deposits of the Canadian Cordillera
W.J. McMillan, J. F. H. Thompson, C.J.R. Hart, S.T. Johnston
1996, Geoscience Canada (23) 125-134
Porphyry deposits are intrusion-related, large tonnage low grade mineral deposits with metal assemblages that may include all or some of copper, molybdenum, gold and silver. The genesis of these deposits is related to the emplacement of intermediate to felsic, hypabyssal, generally porphyritic intrusions that are commonly formed at convergent plate...
Cryptic trace-element alteration of Anorthosite, Stillwater complex, Montana
G.K. Czamanske, P. J. Loferski
1996, Canadian Mineralogist (34) 559-576
Evidence of cryptic alteration and correlations among K, Ba, and LREE concentrations indicate that a post-cumulus, low-density aqueous fluid phase significantly modified the trace-element contents of samples from Anorthosite zones I and II of the Stillwater Complex, Montana. Concentrations of Ba, Ca, Co, Cr, Cu, Fe, Hf, K, Li, Mg,...
Acetochlor in the hydrologic system in the midwestern United States, 1994
D.W. Kolpin, B.K. Nations, D. A. Goolsby, E.M. Thurman
1996, Environmental Science & Technology (30) 1459-1464
The herbicide acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide] was given conditional registration in the United States by the U.S. Environmental Protection Agency in March 1994. This registration provided a rare opportunity to investigate the occurrence of a pesticide during its first season of extensive use in the midwestern United States. Water samples collected and...
A camerate-rich late carboniferous (Moscovian) crinoid fauna from volcanic conglomerate, Xinjiang, People's Republic of China
N.G. Lane, J.A. Waters, C.G. Maples, S.A. Marcus, Z.-T. Liao
1996, Journal of Paleontology (70) 117-128
A low-diversity camerate-rich crinoid fauna from the Qijiagou Formation, Taoshigo Valley near Turpan, Xinjiang-Uygar Autonomous Region, China was collected during field work in May, 1993. The crinoid fauna is dominated by species of Platycrinites. Other camerate crinoids include a species in the Paragaricocrinidae, Actinocrinites, a hexacrinitid, and an acrocrinoid. The...
Sand boils induced by the 1993 Mississippi River flood: Could they one day be misinterpreted as earthquake-induced liquefaction?
Y. Li, J. Craven, E.S. Schweig, S. F. Obermeier
1996, Geology (24) 171-174
In areas that are seismically active but lacking clear surficial faulting, many paleoearthquake studies depend on the interpretation of ancient liquefaction features (sand blows) as indicators of prehistoric seismicity. Sand blows, however, can be mimicked by nonseismic sand boils formed by water seeping...
Mg- and K-bearing borates and associated evaporites at Eagle Borax spring, Death Valley, California: A spectroscopic exploration
J.K. Crowley
1996, Economic Geology (91) 622-635
Efflorescent crusts at the Eagle Borax spring in Death Valley, California, contain an array of rare Mg and K borate minerals, several of which are only known from one or two other localities. The Mg- and/or K-bearing borates include aristarainite, hydroboracite, kaliborite, mcallisterite, pinnoite, rivadavite, and santite. Ulexite and probertite...
Trace fossils from Jurassic lacustrine turbidites of the Anyao Formation (Central China) and their environmental and evolutionary significance
Luis A. Buatois, M. Gabriela Mángano, Xiantao Wu, Guocheng Zhang
1996, Ichnos: An International Journal for Plant and Animal Traces (4) 287-303
The Lower Jurassic Anyao Formation crops out near Jiyuan city, western Henan Province, central China. It is part of the infill of the nonmarine early Mesozoic Jiyuan‐Yima Basin. In the Jiyuan section, this unit is about 100 m thick and consists of laterally persistent, thin and thick‐bedded turbidite sandstones and...
Conodont color and surface textural alteration in the Muschelkalk (Triassic) of the Silesian-Cracow Zn-Pb district, Poland
J.E. Repetski, M. Narkiewicz
1996, Prace - Panstwowego Instytutu Geologicznego (154) 112-120
Limestone and dolostone samples were collected from sites within and adjacent to ore zones in the Trzebionka mine, Silesia-Cracow zinc-lead mining district, southern Poland, to assess the level of thermal alteration of the enclosed conodonts, via the color alteration index (CAI) technique, and to study any surface alteration effects on...
Rare, large earthquakes at the laramide deformation front - Colorado (1882) and Wyoming (1984)
W. Spence, C.J. Langer, G. L. Choy
1996, Bulletin of the Seismological Society of America (86) 1804-1819
The largest historical earthquake known in Colorado occurred on 7 November 1882. Knowledge of its size, location, and specific tectonic environment is important for the design of critical structures in the rapidly growing region of the Southern Rocky Mountains. More than one century later, on 18 October 1984, an mb 5.3 earthquake...
Productivity cycles of 200-300 years in the Antarctic Peninsula region: Understanding linkages among the sun, atmosphere, oceans, sea ice, and biota
A. Leventer, E.W. Domack, S. E. Ishman, S. Brachfeld, C.E. McClennen, P. Manley
1996, Geological Society of America Bulletin (108) 1626-1644
Compared to the rest of the world's oceans, high-resolution late Holocene paleoclimatic data from the Southern Ocean are still rare. We present a multiproxy record from a sediment core retrieved from a deep basin on the western side of the Antarctic Peninsula that reveals a dramatic perspective on paleoclimatic changes...
Paragenetic and minor- and trace-element studies of Mississippi Valley-type ore deposits of the Silesian-Cracow district, Poland
J.G. Viets, D. L. Leach, F.E. Lichte, R.T. Hopkins, C. A. Gent, J. W. Powell
1996, Prace - Panstwowego Instytutu Geologicznego (154) 36-71
Paragenetic and minor- and trace-element studies were conducted on samples of epigenetic ore and gangue minerals collected from mines and drill core in the Silesian-Cracow (S-C) district of southern Poland. Four discrete mineral suites representing four mineralizing stages can be identified throughout the district. The earliest epigenetic minerals deposited during...
Kulshan caldera: A quaternary subglacial caldera in the North Cascades, Washington
W. Hildreth
1996, Geological Society of America Bulletin (108) 786-793
Calderas that collapse during large pyroclastic eruptions are anomalously rare in the Cascade arc. Recognition of the early Pleistocene 4.5 × 8 km Kulshan caldera, filled with rhyodacite ignimbrite at the northeast foot of Mount Baker, brings to only three the Quaternary calderas identified in the Cascades. A near-vertical ring...
Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater
Michael Bau, Andrea Koschinsky, Peter Dulski, James R. Hein
1996, Geochimica et Cosmochimica Acta (60) 1709-1725
In order to evaluate details of the partitioning behaviours of Y, rare earth elements (REEs), and Ti between inorganic metal oxide surfaces and seawater, we studied the distribution of these elements in hydrogenetic marine ferromanganese (Fe-Mn) crusts from the Central Pacific Ocean. Nonphosphatized Fe-Mn crusts display shale-normalized rare earths and...
