Disequilibrium in the 238uranium series in samples from Yeelirrie, Western Australia
R.S. Lively, R.S. Harmon, A. A. Levinson, C.J. Bland
1979, Journal of Geochemical Exploration (12) 57-65
Uranium-series disequilibrium studies carried out on samples from the Yeelirrie uranium deposit, Western Australia, indicate that uranium and radium have been migrating within the deposit during recent times, and are actually being removed from the deposit. Samples collected for 230Th/234U age dating were found to be substantially out of equilibrium,...
U-Th-Pb geochronology of the Massabesic Gneiss and the granite near Milford, South-Central New Hampshire: New evidence for avalonian basement and taconic and alleghenian disturbances in Eastern New England
J. N. Aleinikoff, R. E. Zartman, J.B. Lyons
1979, Contributions to Mineralogy and Petrology (71) 1-11
U-Th-Pb systematics for zircon and monazite from Massabesic Gneiss (paragneiss and orthogneiss) and the granite near Milford, New Hampshire, were determined. Zircon morphology suggests that the paragneiss may be volcaniclastic (igneous) in origin, and thus the age data probably record the date (minimum of 646 m.y.) at which the rock...
D/H ratios in speleothem fluid inclusions: A guide to variations in the isotopic composition of meteoric precipitation?
R.S. Harmon, H.P. Schwarcz, J. R. O’Neil
1979, Earth and Planetary Science Letters (42) 254-266
D/H ratios of fluid inclusion waters extracted from230Th/234U-dated speleothems that were originally deposited under conditions of isotopic equilibrium should provide a direct estimate of the hydrogen isotopic composition of ancient meteoric waters. We present here D/H ratios for 47 fluid inclusion...
Surface faults in the gulf coastal plain between Victoria and Beaumont, Texas
Earl R. Verbeek
1979, Tectonophysics (52) 373-375
Displacement of the land surface by faulting is widespread in the Houston-Galveston region, an area which has undergone moderate to severe land subsidence associated with fluid withdrawal (principally water, and to a lesser extent, oil and gas). A causative link between subsidence and fluid extraction has been convincingly reported in...
The genus Platychara from the Western Hemisphere
R.E. Peck, R. M. Forester
1979, Review of Palaeobotany and Palynology (28) 223-236
The systematics of four species belonging to the genus Platychara (Charophyta) from the Western Hemisphere is discussed. Three of the species, as defined herein, occur in Cretaceous and Paleocene rocks from Mexico through South America. The type species, P. compressa (Peck and Reker) Grambast, also of Cretaceous and Paleocene age,...
Volcanic eruption plumes on Io
R.G. Strom, R.J. Terrile, H. Masursky, C. Hansen
1979, Nature (280) 733-736
An umbrella-shaped plume detected above Io confirms that Io is volcanically active. Preliminary analyses of eight such eruptive plumes are presented. ?? 1979 Nature Publishing Group....
Probability weighted moments compared with some traditional techniques in estimating Gumbel Parameters and quantiles
J. Maciunas Landwehr, N.C. Matalas, J.R. Wallis
1979, Water Resources Research (15) 1055-1064
Estimates of the parameters and quantiles of the Gumbel distribution by the methods of probability weighted moments, (conventional) moments, and maximum likelihood were compared. Results were derived from Monte Carlo experiments by using both independent and serially correlated Gumbel numbers. The method of probability weighted moments was seen...
Magnesium correction to the Na K Ca chemical geothermometer
R.O. Fournier, R.W. Potter II
1979, Geochimica et Cosmochimica Acta (43) 1543-1550
Equations and graphs have been devised to correct for the adverse effects of magnesium upon the Na-K-Ca chemical geothermometer. Either the equations or graphs can be used to determine appropriate temperature corrections for given waters with calculated Na-K-Ca temperatures > 70°C and R < 50, where R =...
Some basic considerations in the design of hydrologic data networks
Marshall E. Moss
1979, Water Resources Research (15) 1673-1676
Two preeminent considerations of data network design are the random nature of the hydrologic phenomena and the uses that will be made of the data. Information distilled from the data is usually measured in a parametric statistical sense, although the data user is more concerned with the integrated measure of...
A new instrument system to investigate sediment dynamics on continental shelves
D.A. Cacchione, D.E. Drake
1979, Marine Geology (30) 299-312
A new instrumented tripod, the GEOPROBE system, has been constructed and used to collect time-series data on physical and geological parameters that are important in bottom sediment dynamics on continental shelves. Simultaneous in situ digital recording of pressure, temperature, light scattering, and light transmission, in combination with current velocity profiles...
Determination of nanogram amounts of bismuth in rocks by atomic absorption spectrometry with electrothermal atomization
Jean S. Kane
1979, Analytica Chimica Acta (106) 325-331
Bismuth concentrations as low as 10 ng g-1 in 100-mg samples of geological materials can be determined by atomic absorption spectrometry with electrothermal atomization. After HF—HClO4 decomposition of the sample, bismuth is extracted as the iodide into methyl isobutyl ketone and is then stripped with ethylenediaminetetraacetic acid into the aqueous phase. Aliquots...
Petrology, composition, and age of intrusive rocks associated with the Quartz Hill molybdenite deposit, southeastern Alaska
T. Hudson, James G. Smith, Raymond L. Elliott
1979, Canadian Journal of Earth Sciences (16) 1805-1822
A large porphyry molybdenum deposit (Quartz Hill deposit) was recently discovered in the heart of the Coast Range batholithic complex about 70 km east of Ketchikan, southeastern Alaska. Intrusive rocks associated with the mineral deposit form two composite epizonal to hypabyssal stocks and many dikes in country rocks. The stocks are...
Comparison of XAD macroporous resins for the concentration of fulvic acid from aqueous solution
G. R. Aiken
1979, Analytical Chemistry (51) 1799-1803
Five macroreticular, nonlonlc AmberlHe XAD resins were evaluated for concentration and Isolation of fulvlc acid from aqueous solution. The capacity of each resin for fulvlc acid was measured by both batch and column techniques. Elution efficiencies were determined by desorptlon with 0.1 N NaOH. Highest recoveries were obtained with the...
The determination of silver in silicate rocks by electrothermal atomic absorption spectrometry
P. J. Aruscavage, E.Y. Campbell
1979, Analytica Chimica Acta (109) 171-175
Silver is extracted from a 20% tartaric acid solution by using butyl acetate and diphenylthiourea, and the organic layer is analyzed directly by the graphite-furnace technique. The precisions is ca. 8% as estimated from multiple analysis of 13 standard rocks; there are no systematic errors. The detection limit is 2.4...
Methods of ultimate carbonaceous BOD determination
J. K. Stamer, S. W. McKenzie, R.N. Cherry
1979, Journal of the Water Pollution Control Federation (51) 918-925
Studies were conducted to provide an accurate and practical technique for determining the concentration of ultimate carbonaceous biochemical oxygen demand and the rate at which this demand is exerted. The three methods evaluated were carbon derived, nitrification adjusted, and nitrification inhibited. The studies indicate that comparable concentrations and reaction rates...
Amino acid racemization dating of fossil bones, I. inter-laboratory comparison of racemization measurements
J.L. Bada, E. Hoopes, D. Darling, G. Dungworth, H.J. Kessels, K.A. Kvenvolden, D.J. Blunt
1979, Earth and Planetary Science Letters (43) 265-268
Enantiomeric measurements for aspartic acid, glutamic acid, and alanine in twenty-one different fossil bone samples have been carried out by three different laboratories using different analytical methods. These inter-laboratory comparisons demonstrate that D/L aspartic acid measurements are highly reproducible, whereas the enantiomeric measurements...
Beach-cusp formation
A. H. Sallenger Jr.
1979, Marine Geology (29) 23-37
Field experiments on beach-cusp formation were undertaken to document how the cuspate form develops and to test the edge-wave hypothesis on the uniform spacing of cusps. These involved observations of cusps forming from an initially plane foreshore. The cuspate form was observed to be a product of swash modification of an...
Barometric fluctuations in wells tapping deep unconfined aquifers
Edwin P. Weeks
1979, Water Resources Research (15) 1167-1176
Water levels in wells screened only below the water table in unconfined aquifers fluctuate in response to atmospheric pressure changes. These fluctuations occur because the materials composing the unsaturated zone resist air movement and have capacity to store air with a change in pressure. Consequently, the translation of any pressure...
Arsenic and fluoride in the upper madison river system: Firehole and gibbon rivers and their tributaries, yellowstone national park, wyoming, and southeast montana
J. M. Thompson
1979, Environmental Geology (3) 13-21
Chemical analyses of 21 water samples from the Firehole and Gibbon Rivers, which combine to form the Madison River, gave arsenic and fluoride values above the Environmental Protection Agency Interim Primary Drinking Water maximum contaminant levels (0.05 mg/l arsenic and 2.0 mg/l fluoride). On 18 October, 1975, during a period...
The flow mechanism in the Chalk based on radio-isotope analyses of groundwater in the London Basin
R.A. Downing, F.J. Pearson, D. B. Smith
1979, Journal of Hydrology (40) 67-83
14C analyses of groundwaters from the Chalk of the London Basin are re-interpreted and the age of the groundwater is revised. Radio-isotope analyses are used to examine the flow mechanism in the aquifer. The evidence supports the view that a network of micro-fissures and larger intergranular pores in the matrix...
Geochemical surveys in the United States in relation to health.
H. A. Tourtelot
1979, Philosophical Transactions of the Royal Society B: Biological Sciences (288) 113-125
Geochemical surveys in relation to health may be classified as having one, two or three dimensions. One-dimensional surveys examine relations between concentrations of elements such as Pb in soils and other media and burdens of the same elements in humans, at a given time. The spatial distributions of element concentrations...
Chemical and isotopic prediction of aquifer temperatures in the geothermal system at Long Valley, California
R.O. Fournier, M.L. Sorey, Robert H. Mariner, A.H. Truesdell
1979, Journal of Volcanology and Geothermal Research (5) 17-34
Temperatures of aquifers feeding thermal springs and wells in Long Valley, California, estimated using silica and Na-K-Ca geothermometers and warm spring mixing models, range from 160/dg to about 220??C. This information was used to construct a diagram showing enthalpy-chloride relations for the various thermal waters in the Long Valley region....
The Palomar planet-crossing asteroid survey, 1973-1978
E. F. Helin, E.M. Shoemaker
1979, Icarus (40) 321-328
Photographic coverage of about 80,000 deg2 of sky with the Palomar 46-cm Schmidt camera has yielded 12 new planet-crossing asteroids as well as many objects in the main asteroid belt. The estimated population of planet-crossing asteroids includes ∼100 Atens, 700 ± 300 Apollos, 1000–2000...
On Chinese earthquake history - An attempt to model an incomplete data set by point process analysis
W.H.K. Lee, D.R. Brillinger
1979, Pure and Applied Geophysics PAGEOPH (117) 1229-1257
Since the 1950s, the Academia Sinica in Peking, People's Republic of China, has carried out extensive research on the Chinese earthquake history. With a historical record dating back some 3000 years, a wealth of information on Chinese earthquakes exists. Despite this monumental undertaking by the Academia Sinica, much work is...
Modern marine sediments as a natural analog to the chemically stressed environment of a landfill
M.J. Baedecker, W. Back
1979, Journal of Hydrology (43) 393-414
Chemical reactions that occur in landfills are analogous to those reactions that occur in marine sediments. Lateral zonation of C, N, S, O, H, Fe and Mn species in landfills is similar to the vertical zonation of these species in marine sediments and results from the following reaction sequence: (1)...
