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...
Cristobalitic stage in the diagenesis of diatomaceous shale
K. J. Murata, J. K. Nakata
1974, Science (184) 567-568
With increasing depth of burial, diagenetic cristobalite in the Monterey Shale of California shows a decrease in the d(101) spacing from 4.115 to 4.040 angstroms, indicative of a progressive change in its internal structure. The spacing is 0.004 to 0.015 angstrom smaller in porcellanite than in associated chert,...
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...
Debris flows originating from soil slips during rainstorms in Southern California
R. H. Campbell
1974, Quarterly Journal of Engineering Geology and Hydrogeology (7) 339-349
Debris flows generated during rainstorms present a greater risk of death and injury to southern California residents than all other kinds of slope failure combined. During the years 1962-1971, twenty-three people in the greater Los Angeles area died from being buried or struck by debris flows, all...
Spring mudflows at Wrightwood, Southern California
D. M. Morton, R. H. Campbell
1974, Quarterly Journal of Engineering Geology and Hydrogeology (7) 377-384
The Wrightwood area in the San Gabriel Mountains of southern California is known as a site of recurring mudflow activity. The community of Wrightwood is built on the coalesced fans of Sheep, Acorn and Heath Creeks, and the fan deposits are probably chiefly of mudflow origin. Historically, mudflows there have...
Preparation and use of isopleth maps of landslide deposits
Robert H. Wright, Russell H. Campbell, Tor H. Nilsen
1974, Geology (2) 483-485
Isopleth maps derived from landslide inventory maps generalize and quantify the areal distribution of landslide deposits in contour form and may be uniquely useful for some types of regional planning. The isopleth format permits incorporation of landslide information with other quantified map data in the preparation of slope stability maps....
Toxicity of formalin, malachite green, and the mixture to four life stages of rainbow trout
Terry D. Bills, Charles F. Advised by: Hosler Jr., Kenneth B. Cumming, Richard P. Nord, Robert E. Senff
1974, Thesis
Formalin, malachite green, or a mixture of them are utilized in fish culture for control of external parasites of fish and control of fungus on fish and fish eggs. Very little information is available concerning the toxicity of these compounds to fish under laboratory test conditions or the differences in...
Some aspects of aquatic insect populations of pools and riffles in gravel bed streams in western United States
Bruce W. Lium
1974, Journal of Research of the U.S. Geological Survey (2) 379-384
Relationships were studied between aquatic-insect populations on rocks of different sizes and variations of populations between different stream localities. All aquatic insects were counted and identified on streambed gravels and cobbles chosen at random from four rivers on three to four types of locations ranging from riffles to pools. The...
The soil creep-curved tree fallacy
Richard L. Phipps
1974, Journal of Research of the U.S. Geological Survey (2) 371-377
No evidence has been found in eastern deciduous forests to substantiate statements that curved tree trunks, downslope tilted tree trunks, and upslope trailing tree root systems are the result of soil creep. Curvature and tilting of trunks are described as geotropic and phototropic responses to physical and physiological conditions unrelated...
Occurrence of dissolved organic carbon in selected ground-water samples in the United States
J. A. Leenheer, Ronald L. Malcolm, P. W. McKinley, Lawrence A. Eccles
1974, Journal of Research of the U.S. Geological Survey (2) 361-369
A study of nonvolatile DOC (dissolved organic carbon) in ground water was conducted to establish base levels of naturally occurring dissolved organic materials. Samples of ground water were obtained at 100 sites in 27 States. Samples were pressure filtered at the time of collection and immediately frozen on dry ice....
Spectrophotometric determination of silica at high concentrations using fluoride as a depolymerizer
Leonard Shapiro
1974, Journal of Research of the U.S. Geological Survey (2) 357-360
Solutions containing in excess of 200μg/ml of silica form polymers which do not react with molybdate in the spectrophotometric determination of silica. Fluoride ions catalyze the depolymerization of silica so that precise spectrophotometric determinations of silica can be made, even when silica is present predominantly as polymers....
Simulated “true color” images from ERTS data
Eric M. Eliason, Pat S. Chavez, Laurence A. Soderblom
1974, Geology (2) 231-234
No abstract available....
Spectrophotometric determination of niobium in rocks
L. Paul Greenland, E.Y. Campbell
1974, Journal of Research of the U.S. Geological Survey (2) 353-355
After acid decomposition and evaporation to volatilize silica, samples containing 0.5 6 μg Nb are fused with pyrosulfate and dissolved in hydrochloric acid tartaric acid. Niobium is separated by thiocyanate extraction with amyl alcohol and back-extracting from the organic solvent with dilute hydrofluoric acid. Niobium is reacted with 4-(2-pyridylazo)-resorcinol to...
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...
Thallium-bearing orpiment, Carlin gold deposit, Nevada
Arthur S. Radtke, Charles M. Taylor, F. W. Dickson, Chris Heropoulos
1974, Journal of Research of the U.S. Geological Survey (2) 341-342
A variety of orpiment, As2S3 , containing a significant amount of thallium has been identified in the unoxidized East ore body of the Carlin gold deposit. The mineral occurs in small veinlets with barite, calcite, quartz, and realgar....
Coloradoite, acanthite, and jarosite from the Cripple Creek district, Teller County, Colorado
Fred A. Hildebrand, Garland B. Gott
1974, Journal of Research of the U.S. Geological Survey (2) 339-340
Coloradoite (HgTe), acanthite (Ag2 S), and jarosite (KFe3(S04)2 (OH)6) have been identified in rocks from the Cripple Creek district, Colorado. Neither acanthite nor jarosite has previously been reported from this mining district. Although the occurrence of coloradoite was reported, its identification was never actually verified. The presence of acanthite may...
Paleozoic tectonics in the Edna Mountain quadrangle, Nevada
R. L. Erickson, S. P. Marsh
1974, Journal of Research of the U.S. Geological Survey (2) 331-337
Geologic mapping at scale 1:24,000 of the Edna Mountain 15-minute quadrangle, Humboldt County, Nev., revealed two episodes of pre-Mesozoic deformation that are difficult to reconcile with either the Antler or the Sonoma orogeny. We believe that the older episode predated the Antler orogeny and may be as old as Late...
The Border Ranges Fault in south-central Alaska
E. M. MacKevett, George Plafker
1974, Journal of Research of the U.S. Geological Survey (2) 323-329
The Border Ranges fault, a major fault of southern Alaska, can be traced for more than 1,000 km arcuately eastward from Kodiak Island to the St. Elias Mountains. Throughout its extent, the fault juxtaposes upper Paleozoic and lower Mesozoic rocks on the north against upper Mesozoic and Tertiary rocks. This...
Generalized geology and structure of the Winkelman 15-minute quadrangle and vicinity, Pinal and Gila Counties, Arizona
M. H. Krieger
1974, Journal of Research of the U.S. Geological Survey (2) 311-321
A. northwest-trending belt of steeply east-dipping Precambrian and Paleozoic sedimentary rocks extends across the Winkelman 15-minute quadrangle and separates areas of contrasting structures. To the southwest for 60 mi is an expanse of Precambrian basement, largely granite; to the northeast the Precambrian and Paleozoic sedimentary rocks are gently tilted and...
Silicoflagellate zonation of upper Cretaceous to lower Miocene deep-sea sediment
David Bukry, J. H. Foster
1974, Journal of Research of the U.S. Geological Survey (2) 303-310
A stratigraphic zonation based on silicoflagellates is proposed for the division of Upper Cretaceous to lower Miocene deep-sea sediments into eight independent zones. The occurrence of silicoflagellate siliceous microfossils from Mesozoic and lower Cenozoic sediment has been poorly known in all but the middle Eocene. The most diagnostic occurrences in...
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...
Palaeomagnetism and magnetic–polarity zonation in some Oligocene volcanic rocks of the San Juan Mountains, south–western Colorado
J. F. Diehl, Myrl E. Beck, Peter W. Lipman
1974, Geophysical Journal International (37) 323-332
Palaeomagnetic results have been obtained from thirty sites in intrusive and extrusive rocks of Oligocene age from the San Juan Mountains, south-western Colorado. All specimens from each site were subjected to af demagnetization, and the reliability of each site determined. Twenty-three sites gave reliable results. Because five sites from the...
Tectonic transition zone in the northeastern Caribbean
Michael S. Marlow, Louis E. Garrison, Ray G. Martin, James V. A. Trumbull, Alan K. Cooper
1974, Journal of Research of the U.S. Geological Survey (2) 289-302
Seismic reflection data indicate that the Atlantic plate has been underthrust beneath the Caribbean plate east of the Lesser Antilles. The data further reveal that the transition from underthrust to strike-slip plate motion occurs near lat 19.3° N. and long 62° W. in alinement with the Anegada Trough. Oceanic basement...
Some morphometric properties of experimentally cratered surfaces
Alfred H. Truesdell, Wendy Singers
1974, Journal of Research of the U.S. Geological Survey (2) 279-288
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...
Geochemical indicators of subsurface temperature: Part 2, estimation of temperature and fraction of hot water mixed with cold water
R.O. Fournier, A. H. Truesdell
1974, Journal of Research of the U.S. Geological Survey (2) 263-270
The water in many warm springs with large rates of flow consists of mixtures of hot water that has come from depth and of shallow cold water. Under favorable conditions the original temperature of the hot water and the fraction of the cold water in the mixture can be estimated...
