A sensitive and rapid method for the determination of trace amounts of selenium in geologic materials
George L. Crenshaw, Hubert William Lakin
1974, Journal of Research of the U.S. Geological Survey (2) 483-487
A sensitive method for the determination of less than crustal abundance amounts of selenium has been developed that can be useful in the geochemical investigation of selenium. The sample is roasted with a flux of sodium carbonate, chloride, and chlorate and then digested in a mixture of nitric and phosphoric...
Mineralogical studies of the nitrate deposits of Chile IV. Brüggenite, Ca(IO3)2-H2O, a new saline mineral
George E. Ericksen, Mary E. Mrose, John Marinenko
1974, Journal of Research of the U.S. Geological Survey (2) 471-478
Brüggenite, Ca(I0 3 )2 - H2 0, is found in veins of high-purity soda niter in rhyolite tuff at Pampa Pique III, Oficina Lautaro, Chile, as long columnar anhedral crystals, as prismatic crystals, and as irregular anhedral crystals or encrusting masses. The mineral is colorless to bright yellow, and transparent...
Birnessite (delta MnO2-3H2O) in a large spherulite in obsidian near Silver Cliff, Colorado
Fred A. Hildebrand
1974, Journal of Research of the U.S. Geological Survey (2) 467-469
Birnessite and cryptomelane were identified in the montmorillonitic border zone of a large spherulite in obsidian north of Silver Cliff, Colo. The manganese minerals contain no silver and probably formed more recently than argentian cryptomelane which is abundant in the manganiferous silver ores of the surrounding volcanic rocks....
Equilibria of cinnabar, stibnite, and saturated solutions in the system HgS-Sb2S3-Na2S-H2O from 150° to 250°C at 100 bars, with implications concerning ore genesis
R. E. Learned, G. Tunell, F. W. Dickson
1974, Journal of Research of the U.S. Geological Survey (2) 457-466
The common occurrence of cinnabar and stibnite in well-defined districts in the same epithermal environments suggests that similar physiochemical processes are responsible for the genesis of the two minerals; however, cinnabar and stibnite tend to be segregated within these districts and also within individual deposits that contain both minerals. Where...
Activity-product constants of aragonite at 90° and 51°C
R. M. Siebert, P. B. Hostetler, C. L. Christ
1974, Journal of Research of the U.S. Geological Survey (2) 447-455
The activity-product constants of aragonite, KA=[Ca2+][CO32-] (where the brackets denote activities), were determined experimentally at 90°C and at 51°C. Results at 90°C were obtained from four separate dolomite dissolution runs, in which aragonite precipitated and came to equilibrium with the aqueous phase (from the direction of. supersaturation), and from two...
Energy dispersive spectrometry for quantitative mineralogical analyses: An ancillary system on an electron microphobe
George A. Desborough, Robert H. Heidel
1974, Journal of Research of the U.S. Geological Survey (2) 441-446
Investigation of the Li-drifted Si-semiconductor X-ray detector for quantitative elemental analysis of some common rock-forming minerals shows that amounts of certain major elements having K spectra in the energy range of about 1.74 (Si) to 8.64 (Zn) kiloelectronvolts may be accurately determined, if spectral interferences are absent. Elements in major...
Seasonal variation of the upper digestive tract yeast flora of feral pigeons
R. M. Kocan, H.F. Hasenclever
1974, Journal of Wildlife Diseases (10) 263-266
Feral pigeons were sampled over a 16-month period to determine whether their normal yeast flora varied according to season. Candida albicans and Saccharomyces telluris occurred during the entire sampling period, with C. albicans reaching its highest levels between August and January and S. telluris peaking from March through May. Candida krusei was present for 10 months but exhibited no predictable...
Organochlorine residues in brown pelican eggs: Relation to reproductive success
L. J. Blus, B.S. Neely Jr., A. A. Belisle, R. M. Prouty
1974, Environmental Pollution (7) 81-91
This study was conducted to determine the influence of residues of organochlorine pollutants on reproductive success in the brown pelican. A sample egg was taken from each of 93 marked nests in the nesting colony in South Carolina. Periodic visits were made to...
Plasma enzyme activities in coturnix quail fed graded doses of DDE, polychlorinated biphenyl, malathion, and mercuric chloride
M. P. Dieter
1974, Toxicology and Applied Pharmacology (27) 86-98
Male Coturnix quail (Coturnix coturnix japonica) were fed diets for 12 weeks containing graded levels of DDE, polychlorinated biphenyl (Aroclor 1254), malathion, and mercuric chloride. Birds were bled prior to exposure and at 2, 4 and 12 weeks, and the plasma used to measure the activities of creatine kinase, aspartate...
Estimating the “thickness” of the Boulder Batholith, Montana, from heat-flow and heat-productivity data
Robert I. Tilling
1974, Geology (2) 457-460
Estimates of minimum thickness of the Boulder batholith, computed using the linear relation between heat flow and heat productivity and assuming constant heat productivity with depth, are highly nonspecific. They can vary between about 3 and 20 km, depending on values of surface-rock heat productivity and values of assumed contribution...
Status of projects in Minnesota, 1974-75 fiscal years
U.S. Geological Survey
1974, Report
No abstract available....
The calculation of aquifer chemistry in hot-water geothermal systems
Alfred H. Truesdell, Wendy Singers
1974, Journal of Research of the U.S. Geological Survey (2) 271-278
The temperature and chemical conditions (pH, gas pressure, and ion activities) in a geothermal aquifer supplying a producing bore can be calculated from the enthalpy of the total fluid (liquid + vapor) produced and chemical analyses of water and steam separated and collected at known pressures. Alternatively, if a single...
The natural quality of ground water in Minnesota
T. C. Winter
1974, Bulletin 26
No abstract available....
Nature of the angular unconformity between the Paleozoic metasedimentary rocks and the mesozoic metavolcanic rocks in the eastern Sierra Nevada, California
C.A. Brook, Warren J. Nokleberg, Ronald W. Kistler
1974, GSA Bulletin (85) 571-576
Two major wall-rock sequences, the Paleozoic metasedimentary rocks and the Mesozoic metavolcanic rocks, in the eastern Sierra Nevada, California, are separated by an angular unconformity rather than by a fault as has been proposed by other investigators. The unconformity is parallel to formation contacts in the younger metavolcanic rocks and...
Preliminary report on geology along Atlantic continental margin of northeastern United States
J. P. Minard, W. J. Perry, Elaine G. A. Weed, E. C. Rhodehamel, E. I. Robbins, R. B. Mixon
1974, American Association of Petroleum Geologists Bulletin (58) 1169-1178
The U.S. Geological Survey is conducting a geologic and geophysical study of the northeastern United States outer continental shelf and the adjacent slope from Georges Bank to Cape Hatteras. The study also includes the adjacent coastal plain because it is a more accessible extension of the shelf. The total study...
An optimum reduction of gauges to meet data program constraints
Thomas Maddock III
1974, Hydrological Sciences Bulletin (19) 337-345
Budget or manpower constraints may force a reduction in data collection activities. However, information may be transferred from continued gauge sites to discontinued gauge sites provided there is ‘sufficient’ correlation between flow sequences. Information defined as the reciprocal of variance (of the parameter estimator for which the gauge has been...
Changes in oxygen and primary production of the Patuxent estuary, Maryland, 1963 through 1969
R. L. Cory
1974, Chesapeake Science (15) 78-83
From 1963 through 1969, the U.S. Geological Survey operated a water-quality monitor system in the upper-middle Patuxent estuary, near Benedict, Maryland. Over the period of record, a pronounced change occurred in the diel (24 hr.) oxygen measurement, particularly during the months of July, August, and September. Annual variations of dissolved...
Pesticides in selected western streams, 1968-71
Jean A. Schulze, Douglas B. Manigold, Freeman L. Andrews
1974, Pesticides Monitoring Journal (7) 73-84
No abstract available....
Channel changes
William W. Emmett
1974, Geology (2) 271-272
Environmental impacts may alter the quantities of water and sediment carried in a stream and thus may increase or diminish naturally occurring rates of channel changes and the pre-impact frequency of flows. Repetitive cross-channel surveys to determine changes in channel size or location are a measure of the response of...
The literature of the California black rail
Sanford R. Wilbur
1974, Special Scientific Report - Wildlife 179
Few birds have remained so little known as the California black rail (Laterallus jamaicensis coturniculus). Although first collected in 1859 or before and reported in 1874 (Ridgway 1874), its life history, distribution, and status have remained so obscure that even a sight record of the bird is deemed worthy of...
Selected chlorinated hydrocarbons in bottom material from streams tributary to San Francisco Bay
LeRoy M. Law, Donald F. Goerlitz
1974, Pesticides Monitoring Journal (8) 33-36
As part of a study of the environmental quality of San Francisco Bay, bottom material from 26 streams tributary to the Bay were analyzed for chlordane, DDD, DDE, DDT, and PCB residues. These compounds were present in essentially all streams tested. Chlordane proved to be ubiquitous, with a concentration range...
Relationships among three criteria of puberty in Peromyscus leucopus noveboracensis
J.G. Rogers Jr., G.K. Beauchamp
1974, Journal of Mammalogy (55) 461-462
No abstract available. ...
MER: Ultimate recovery and production rate
W. K. Savage, A. R. Thachuk, Hassan Beykpour, J. H. Lohrenz
1974, Conference Paper
No abstract available....
K-Ar Age Relations of Granodiorite Emplacement and Tungsten and Gold Mineralization near the Getchell Mine, Humboldt County, Nevada
Miles L. Silberman, B. R. Berger, Randolph A. Koski
1974, Economic Geology (69) 646-656
A granodiorite stock intrudes complexly folded and thrust-faulted Paleozoic sedimentary rocks in the Osgood Mountains of eastern Humboldt County, Nevada. Within the metamorphic aureole surrounding the pluton, the sedimentary rocks are converted to cordierite hornfels and marble; tungsten-bearing tactites developed along the contacts of the granodiorite. Cutting the granodiorite and...
North polar region of Mars: Imaging results from Viking 2
J.A. Cutts, K.R. Blasius, G.A. Briggs, M. H. Carr, Ronald Greeley, Harold Masursky
1974, Science (194) 1329-1337
During October 1976, the Viking 2 orbiter acquired approximately 700 high-resolution images of the north polar region of Mars. These images confirm the existence at the north pole of extensive layered deposits largely covered over with deposits of perennial ice. An unconformity within the layered deposits suggests a complex history...
