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...
Population biology of plains cottonwood (Populus sargentii) in northeast Colorado. (Undergraduate honors thesis)
K. McEachern
1979, Thesis
No abstract available at this time...
Random crustal magnetization and its effect on coherence of short-wavelength marine magnetic anomalies
R.J. Blakely
1979, Earth and Planetary Science Letters (46) 43-48
Recent studies of DSDP samples from layer 2A of oceanic basement have found complex magnetic stratigraphies that seem incompatible with the frequent existence of linear short-wavelength anomalies caused by palaeomagnetic field behavior. Statistical models are developed for the lateral variation of...
Removal of contaminants from landfill leachates by filtration through glauconitic greensands
N. Spoljaric, W.A. Crawford
1979, Environmental Geology (2) 359-363
Passing landfill leachate through glauconitic greensand filters reduces the heavy metal cation content, lessens the unpleasant odor, and diminishes the murkiness of the leachate. The capability of the greensand to trap metal cations is increased by prolonging the contact time between the leachate and the greensand. Flushing the charged greensand...
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...
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...
Seismic gaps and source zones of recent large earthquakes in coastal Peru
J. W. Dewey, W. Spence
1979, Pure and Applied Geophysics PAGEOPH (117) 1148-1171
The earthquakes of central coastal Peru occur principally in two distinct zones of shallow earthquake activity that are inland of and parallel to the axis of the Peru Trench. The interface-thrust (IT) zone includes the great thrust-fault earthquakes of 17 October 1966 and 3 October 1974. The coastal-plate interior (CPI)...
An algol program for dissimilarity analysis: a divisive-omnithetic clustering technique
J.C. Tipper
1979, Computers & Geosciences (5) 1-13
Clustering techniques are used properly to generate hypotheses about patterns in data. Of the hierarchical techniques, those which are divisive and omnithetic possess many theoretically optimal properties. One such method, dissimilarity analysis, is implemented here in ALGOL 60, and determined to be competitive computationally with most other methods. ?? 1979....
Rare earth abundances and Rb-Sr systematics of basalts, gabbro, anorthosite and minor granitic rocks from the Indian Ocean Ridge System, Western Indian Ocean
C. E. Hedge, K. Futa, C.G. Engel, R.L. Fisher
1979, Contributions to Mineralogy and Petrology (68) 373-376
Basalts dredged from the Mid-Indian Ocean Ridge System have rare earth, Rb, and Sr concentrations like those from other mid-ocean ridges, but have slightly higher Sr87/Sr86 ratios. Underlying gabbroic complexes are similar to the basalts in Sr87/Sr86, but are poorer K, Rb, and in rare earths. The chemical and isotopic...
Amino-acid racemizarion in Quaternary shell deposits at Willapa Bay, Washington
K.A. Kvenvolden, D.J. Blunt, H.E. Clifton
1979, Geochimica et Cosmochimica Acta (43) 1505-1520
Extents of racemization (dl">dl ratios) of amino acids in fossil Saxidomus giganteus (Deshayes) and Ostrea lurida Carpenter were measured on shell deposits exposed at 21 sites on the east side of Willapa Bay, Washington. Amino acids from Saxidomus show less variability in <span...
Major geochemical processes in the evolution of carbonate-Aquifer systems
B.B. Hanshaw, W. Back
1979, Journal of Hydrology (43) 287-312
As a result of recent advances by carbonate petrologists and geochemists, hydrologists are provided with new insights into the origin and explanation of many aquifer characteristics and hydrologic phenomena. Some major advances include the recognition that: (1) most carbonate sediments are of biological origin; (2) they have a strong bimodal...
Uranium mobility during interaction of rhyolitic obsidian, perlite and felsite with alkaline carbonate solution: T = 120° C, P = 210 kg/cm2
Robert A. Zielinski
1979, Chemical Geology (27) 47-63
Well-characterized samples of rhyolitic obsidian, perlite and felsite from a single lava flow are leached of U by alkaline oxidizing solutions under open-system conditions. Pressure, temperature, flow rate and solution composition are held constant in order to evaluate the relative importance of differences in surface area and crystallinity. Under the...
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 =...
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...
A large submarine sand-rubble flow on kilauea volcano, hawaii
D.J. Fornari, J.G. Moore, L. Calk
1979, Journal of Volcanology and Geothermal Research (5) 239-256
Papa'u seamount on the south submarine slope of Kilauea volcano is a large landslide about 19 km long, 6 km wide, and up to 1 km thick with a volume of about 39 km3. Dredge hauls, remote camera photographs, and submersible observations indicate that it is composed primarily of unconsolidated...
Basic magnetic properties of bituminous coal
C.C. Alexander, A. N. Thorpe, F. E. Senftle
1979, Fuel (58) 857-863
Magnetic susceptibility and other static magnetic parameters have been measured on a number of bituminous coals from various locations in the United States. The paramagnetic Curie constant correlates negatively with carbon concentration on a moisture-free basis. The major contribution to the total paramagnetism comes from the mineral matter rather than...
Photogrammetric portrayal of Mars topography
Sherman S.C. Wu
1979, Journal of Geophysical Research Solid Earth (84) 7955-7960
Special photogrammetric techniques have been developed to portray Mars topography, using Mariner and Viking imaging and nonimaging topographic information and earth-based radar data. Topography is represented by the compilation of maps at three scales: global, intermediate, and very large scale. The global map is a synthesis of topographic information obtained...
Diagenetic changes in the elemental composition of unrecrystallized mollusk shells
P.C. Ragland, O. H. Pilkey, B. W. Blackwelder
1979, Chemical Geology (25) 123-134
The Mg, Sr, Mn, Fe, Na and K contents were determined for 230 apparently unrecrystallized mollusk shells (gastropods and bivalves) ranging in age from late Cretaceous to Holocene. Consistent differences between the Holocene and fossil shells with respect to concentrations of all these elements are attributed to postburial diagenetic changes....
Pattern drilling exploration: Optimum pattern types and hole spacings when searching for elliptical shaped targets
L.J. Drew
1979, Journal of the International Association for Mathematical Geology (11) 223-254
In this study the selection of the optimum type of drilling pattern to be used when exploring for elliptical shaped targets is examined. The rhombic pattern is optimal when the targets are known to have a preferred orientation. Situations can also be found where a rectangular pattern is as efficient...
The thermal expansion of anhydrite to 1000° C
Howard T. Evans Jr.
1979, Physics and Chemistry of Minerals (4) 77-82
The thermal expansion of anhydrite, CaSO4, has been measured from 22° to 1,000° C by X-ray diffraction, using the Guinier-Lenné heating powder camera. The heating patterns were calibrated with Guinier-Hägg patterns at 25° C, using quartz as internal standard. Heating experiments were run on natural anhydrite (Bancroft, Ontario), which at...
Concentrations of metals in very small volumes of soil solution
T. Hinkley
1979, Nature (277) 444-446
A new method of sampling very small amounts of soil solution (0.3 g) shows that soil solutions contain high concentrations and unusual proportions of metals. In the soils studied, the solution is close in both metal proportions and total metal mass to what may be taken up annually by the...
Chemical composition of Mars
J. W. Morgan, E. Anders
1979, Geochimica et Cosmochimica Acta (43) 1601-1610
The composition of Mars has been calculated from the cosmochemical model of Ganapathy and Anders (1974) which assumes that planets and chondrites underwent the same 4 fractionation processes in the solar nebula. Because elements of similar volatility stay together in these processes, only 4 index elements (U, Fe, K and Tl or...
Temperature calibration of amino acid racemization: Age implications for the Yuha skeleton
J. L. Bischoff, W.M. Childers
1979, Earth and Planetary Science Letters (45) 172-180
D/L of aspartic acid ranged from 0.52 to 0.56 for femur samples of the Yuha skeleton. Subsurface temperature measurements made at the burial site indicate average annual temperature is 18°C and diagenetic temperature is 21.6°C. These data and a relation derived for...
Geochemical and hydrologic considerations and the use of enthalpy-chloride diagrams in the prediction of underground conditions in hot-spring systems
R.O. Fournier
1979, Journal of Volcanology and Geothermal Research (5) 1-16
Thermal water ascending in a hot-spring system may cool by conduction of heat to the surrounding rock, by boiling, by mixing with cooler water, or by a combination of these processes. Complete or partial chemical reequilibration may occur as a result of this cooling. In spite of these complexities, in...
Modeling and optimizing a gas-water reservoir: Enhanced recovery with waterflooding
M.E. Johnson, E.A. Monash, M.S. Waterman
1979, Journal of the International Association for Mathematical Geology (11) 63-74
Accepted practice dictates that waterflooding of gas reservoirs should commence, if ever, only when the reservoir pressure has declined to the minimum production pressure. Analytical proof of this hypothesis has yet to appear in the literature however. This paper considers a model for a gas-water reservoir with a variable production...
