Chemical variations across the Alaska-Aleutian Range batholith
Bruce L. Reed, Marvin A. Lanphere
1974, Journal of Research of the U.S. Geological Survey (2) 343-352
A study of 79 chemical analyses of plutonic rocks in the northern part of the Alaska-Aleutian Range batholith shows that K2O and SiO2 in Late Cretaceous and Tertiary rocks decrease toward the Pacific margin and that Al2O3 and CaO increase. Plots for Fe2O3, FeO, MgO, and TiO2 suggest a...
Artificial Recharge — State of the Art
R. F. Brown, D. C. Signor
1974, Groundwater (12) 152-160
The largest potential reservoir for the storage of potable water is in the unsaturated zone. Use of this space for the storage and retrieval of potable water is a multifaceted problem which requires application of the best talent from the scientific community.Artificial recharge has many similarities to liquidwaste disposal through...
Adsorption of MBAS from wastewaters and secondary effluents
David A. Rickert, Joseph V. Hunter
1974, Journal of the Water Pollution Control Federation (46) 911-919
On the basis of adsorption behavior, there seems to be three groups of methylene blue active substances (MBAS) in wastewaters and secondary effluents. The first group is observed at low dosages of activated carbon, contains the bulk of the total MBAS, and is readily adsorbable. The second is noted at...
Estimating survival rates from banding of adult and juvenile birds
Douglas H. Johnson
1974, Journal of Wildlife Management (38) 290-297
The restrictive assumptions required by most available methods for estimating survival probabilities render them unsuitable for analyzing real banding data. A model is proposed which allows survival rates and recovery rates to vary with the calendar year, and also allows juveniles to have rates different from adults. In addition to...
Tectonic evolution of the southern Gulf of Mexico
George W. Moore, Luis Del Castillo
1974, GSA Bulletin (85) 607-618
A detailed magnetic survey in the southern Gulf of Mexico shows subdued irregular magnetic anomalies that are similar in wave length to those attributed to sea-floor spreading on present-day oceanic rises. The small amplitude of these anomalies, about 75γ, would be compatible with an oceanic basalt source at a depth...
Fluid inclusion and light stable isotope study of the climax molybdenum deposits, Colorado
W. E. Hall, Irving Friedman, J. Thomas Nash
1974, Economic Geology (69) 88-901
The Climax mine contains three molybdenite ore bodies and widespread late quartz-pyrite-sericite barren mineralization, each related to separate intrusive phases of the Climax stock. Alteration zones spatially related to each molybdenite ore body include a silica zone below, a potassium-silicate zone that approximately coincides with ore, and overlying quartz-sericite-pyrite-topaz, argillic,...
WATEQ, a computer program for calculating chemical equilibria of natural waters
A. H. Truesdell, Blair F. Jones
1974, Journal of Research of the U.S. Geological Survey (2) 233-248
The computer program, WATEQ, calculates the equilibrium distribution of inorganic aqueous species of major and important minor elements in natural waters using the chemical analysis and in situ measurements of temperature, pH, and redox potential. From this model, the states of reaction of the water with solid and gaseous phases...
Preliminary study of rock alteration in the Catheart Mountain molybdenum-copper deposit, Maine
Robert G. Schmidt
1974, Journal of Research of the U.S. Geological Survey (2) 189-194
Studies of drill cores from the Catheart Mountain molybdenum-copper deposit indicate that the deposit is of the porphyry type. Hydrothermal alteration and sulfide mineralization are probably distributed in complex but systematic alteration zones. Most or all mineralization at Catheart Mountain is in a medium-fine-grained quartz monzonite enclosed within a larger...
Thermal inertia mapping from satellite – Discrimination of geologic units in Oman
H. A. Pohn, Terry W. Offield, Kenneth Watson
1974, Journal of Research of the U.S. Geological Survey (2) 147-158
The Nimbus III and IV satellites provide reflectance and emittance data from the earth's surface at 8-km resolution. These data have been used to derive a physical property of geologic materials termed '"thermal inertia" which appears to have great promise for discriminating surficial units. A thermal inertia map of part...
Geologic interpretation of gravity profiles in the western Marquette district, northern Michigan
John S. Klasner, W.F. Cannon
1974, GSA Bulletin (85) 213-218
The presence of elongate troughs of Precambrian X (middle Precambrian) rocks in Precambrian W (lower Precambrian) rocks in the western Marquette district of northern Michigan has been known since the late 1800s. However, little data can be brought to bear on estimates of...
Preliminary model for extrusion and rifting at the axis of the Mid-Atlantic Ridge, 36°48′ North
James G. Moore, H.S. Fleming
1974, Geology (2) 437-440
The inner rift valley of the Mid-Atlantic Ridge at 36°48′ N. is 1.5 to 3 km wide and 100 to 400 m deep. It is symmetrical in profile with a discontinuous medial ridge 100 to 240 m high and 800 to 1,300 m wide along its axis. The medial ridge...
Floods of January 1974 in Washington
R.J. Longfield
1974, Report
Record floods occurred in parts of Washington during January 14-21, 1974. The floods resulted from runoff from warm, moderately heavy rain that continued most of the week, augmented by runoff from the rapid melting of a near-record snowpack that extended to low elevations. New record peak flows occurred at many...
Sandstone distribution patterns in the Pocahontas Formation of southwest Virginia and southern West Virginia
Kenneth J. Englund
G. Briggs, editor(s)
1974, Book chapter, Carboniferous of the southeastern United States
The Pocahontas Formation is a clastic wedge of sandstone, siltstone, shale, coal, and underclay that is transitional between underlying marine strata of Mississippian age and overlying continental beds of Pennsylvanian age. It attains a maximum thickness of 750 ft. at the southeastern edge of the Appalachian coal field and thins...
Water-management studies of a stream-aquifer system, Arkansas River Valley, Colorado
O. James Taylor, Richard R. Luckey
1974, Groundwater (12) 22-38
A mathematical model was developed and used to simulate the stream-aquifer system in the Arkansas River valley in southeastern Colorado, from Pueblo to the Colorado-Kansas State line. The model simulates the interrelations among ground water and surface water including reservoirs, losses, and transmountain diversions, utilizing various water-distribution rules. The model...
Seasonal water potential changes in Sonoran Desert shrubs in relation to topography
William L. Halvorson, Duncan T. Patten
1974, Ecology (55) 173-177
Water potential in Sonoran Desert shrubs was recorded from September 1968 through September 1969. Special attention was paid to recording maximum and minimum potentials on a seasonal basis and diurnal fluctuations during the wettest and driest periods of the year. Franseria deltoidea developed the lowest potential (—85 bar) of the...
Availability of ground water in the lower Pawcatuck River basin, Rhode Island
Joseph B. Gonthier, Herbert E. Johnston, Glenn T. Malmberg
1974, Water Supply Paper 2033
The lower Pawcatuck River basin in southwestern Rhode Island is an area of about 169 square miles underlain by crystalline bedrock over which lies a relatively thin mantle of glacial till and stratified drift. Stratified drift, consisting dominantly of sand and gravel, occurs in irregularly shaped linear deposits that are...
The regolith at the Apollo 15 site and its stratigraphic implications
M. H. Carr, C.E. Meyer
1974, Geochimica et Cosmochimica Acta (38) 1183-1197
Regolith samples from the Apollo 15 landing site are described in terms of two major fractions, a homogeneous glass fraction and a non-homogeneous glass fraction. The proportions of different components in the homogeneous glass fraction were determined directly by chemical analyses of individual...
Oxygen isotope activities and concentrations in aqueous salt solutions at elevated temperatures: Consequences for isotope geochemistry
A.H. Truesdell
1974, Earth and Planetary Science Letters (23) 387-396
Studies of the effect of dissolved salts on the oxygen isotope activity ratio of water have been extended to 275°C. Dehydrated salts were added to water of known isotope composition and the solutions were equilibrated with CO2 which was sampled for analysis. For...
Ejecta from large craters on the Moon: Comments on the geometric model of McGetchin et al.
R.J. Pike
1974, Earth and Planetary Science Letters (23) 265-271
Amendments to a quantitative scheme developed by T.R. McGetchin et al. (1973) for predicting the distribution of ejecta from lunar basins yield substantially thicker estimates of ejecta, deposited at the basin rim-crest and at varying ranges byond, than does the original model....
The role of lava erosion in the formation of lunar rilles and Martian channels
M. H. Carr
1974, Icarus (22) 1-23
Lava tubes and channels develop around active sources of low viscosity lava. The channels normally form without erosion; however, sustained flow can result in the incision of a lava channel and simulation of fluvial erosion features. Lava erosion by means of thermal incision...
40Ar/39Ar age spectra of some undisturbed terrestrial samples
G. Brent Dalrymple, M. A. Lanphere
1974, Geochimica et Cosmochimica Acta (38) 715-738
40Ar/39Ar age spectra and 40Ar/36Ar vs 39Ar/36Ar isochrons were determined by incremental heating for 11 terrestrial rocks and minerals whose geology indicates that they represent essentially undisturbed systems. The samples include muscovite, biotite, hornblende, sanidine, plagioclase, dacite, diabase and basalt and range in age from...
Mercury's surface: Preliminary description and interpretation from Mariner 10 pictures
B. C. Murray, M. J. S. Belton, G. Edward Danielson, M. E. Davies, D. E. Gault, B. Hapke, B. O'Leary, R.G. Strom, V. Suomi, N. Trask
1974, Science (185) 169-179
The surface morphology and optical properties of Mercury resemble those of the moon in remarkable detail and record a very similar sequence of events. Chemical and mineralogical similarity of the outer layers of Mercury and the moon is implied; Mercury is probably a differentiated planet with a large iron-rich core....
Craters on Earth, Moon, and Mars: Multivariate classification and mode of origin
R.J. Pike
1974, Earth and Planetary Science Letters (22) 245-255
Testing extraterrestrial craters and candidate terrestrial analogs for morphologic similitude is treated as a problem in numerical taxonomy. According to a principal-components solution and a cluster analysis, 402 representative craters on the Earth, the Moon, and Mars divide into two major classes...
Osmium, ruthenium, iridium and uranium in silicates and chromite from the eastern Bushveld Complex, South Africa
R.h. Gijbels, Hugh T. Millard Jr., G. A. Desborough, A.J. Bartel
1974, Geochimica et Cosmochimica Acta (38) 319-337
Osmium, ruthenium, iridium and uranium contents were determined in eight ortho pyroxene, seven plagioclase, and three chromite mineral separates from the eastern Bushveld Complex. Neutron activation analysis was used to measure the platinum metals, and uranium was determined by a fission track technique....
Martian planetwide crater distributions: Implications for geologic history and surface processes
L.A. Soderblom, C.D. Condit, R.A. West, B.M. Herman, T. J. Kreidler
1974, Icarus (22) 239-263
Population-density maps of craters in three size ranges (0.6 to 1.2 km, 4 to 10 km, and >20 km in diameter) were compiled for most of Mars from Mariner 9 imagery. These data provide: historical records of the eolian processes (0.6 to 1.2 km craters); stratigraphic, relative, and absolute timescales...
