Rapid separation of polychlorinated biphenyls from DDT and its analogues on silica gel
Diane Snyder, Robert E. Reinert
1971, Bulletin of Environmental Contamination and Toxicology (6) 385-390
Polychlorinated biphenyls (PCB's), which are used in industry worldwide (i), have been found as residues in numerous wildlife species (2-7). Because of the similarity in chemical characteristics, PCB compounds interfere with gas liquid chromatographic (GLC) analysis of certain chlorinated hydrocarbon insecticides (8). In the present study, we sought a rapid...
Mechanisms controlling world water chemistry: Evaporation-crystallization process
J. H. Feth
1971, Science (172) 870-871
No abstract available....
Origin and emplacement of the ultramafic rocks of the Emigrant Gap area, California
O.B. James
1971, Journal of Petrology (12) 523-560
The ultramafic bodies of the Emigrant Gap area are part of a mafic complex within a large composite pluton of the northern Sierra Nevada. The pluton was magmatically emplaced and is surrounded by an aureole of hornblende-hornfels facies rocks. Inclusions of country rock in ultramafic rock are of pyroxene-hornfels...
Quadratic elongation: A quantitative measure of distortion in coordination polyhedra
Kelly F. Robinson, G.V. Gibbs, P.H. Ribbe
1971, Science (172) 567-570
Quadratic elongation and the variance of bond angles are linearly correlated for distorted octahedral and tetrahedral coordination complexes, both of which show variations in bond length and bond angle. The quadratic elonga tion is dimensionless, giving a quantitative measure of polyhedral distortion which is independent of the effective size of...
Magnetic anomalies over the continents
Isidore Zietz
1971, Eos Science News (52) 204-209
By far most of the magnetic coverage over continents has been made via aircraft. The obvious advantages of the airborne method over ground measurements are the speed and economy of the survey, the coverage of areas that are inaccessible on the ground, and the nature of the data, which are...
Water levels in carbonate rock terranes
H. E. LeGrand, V. T. Stringfield
1971, Groundwater (9) 4-10
Many subtle aspects of water levels in carbonate rocks need to be put in perspective even though hydrologists have recognized the fundamental value of characteristics of ground-water levels. The depth to the water table in carbonate rocks is controlled by local factors such as permeability and...
Ore fluids in the porphyry copper deposit at Copper Canyon, Nevada
J. Thomas Nash, Ted G. Theodore
1971, Economic Geology (66) 385-399
The large, low-grade copper and gold deposit at Copper Canyon, Lander County, Nevada, formed in the contact metasomatic environment adjacent to a shallow Tertiary intrusion. Vein and disseminated chalcopyrite-pyrite-pyrrhotite-arsenopyrite mineralization, with lesser amounts of gold, galena, sphalerite, marcasite, and siderite occur in the Upper Cambrian...
A Holocene ore body of copper oxides and carbonates at Ray, Arizona
C. H. Phillips, H. R. Cornwall, Meyer Rubin
1971, Economic Geology (66) 495-498
No abstract available....
Man-made earthquakes and earthquake prediction
J. H. Healy, L. C. Pakiser
1971, Eos Science News (52) 171-174
Convincing evidence that man can trigger earthquakes has been developed since the 1963–1967 report. The fact that man can start earthquakes has increased our understanding of earthquake mechanisms and reinforced our judgment that we are approaching the possibility of earthquake prediction.Traditionally, seismologists have avoided the subject of earthquake prediction because...
Mapping from space
Alden P. Colvocoresses
1971, Journal of the Surveying and Mapping Division (97) 125-132
Remote sensing of the earth promises to become an operational tool of the engineer and the scientist within the next few years. There are no real technical limits on the uses of data from space sensors. However, it is not practical to fly special missions, particularly in space, for each...
Primary and secondary sulfates at Goldfield, Nevada
M.L. Jensen, Roger P. Ashley, J. P. Albers
1971, Economic Geology (66) 618-626
High S-34 values for primary alunites (formed during hydrothermal phase) replacing plagioclase and groundmass of altered volcanic rocks, secondary alunite veins (formed during supergene alteration) with S-34 values near zero permil...
Eocene volcanism and the origin of horizon A
T. G. Gibson, K.M. Towe
1971, Science (172) 152-154
A series of closely time-equivalent deposits that correlate with seismic reflector horizon A exists along the coast of eastern North America. These sediments of Late-Early to Early-Middle Eocene age contain an authigenic mineral suite indicative of the alteration of volcanic glass. A volcanic origin for these siliceous deposits onshore is...
A new stratification of mourning dove call-count routes
L. H. Blankenship, A.B. Humphrey, Duncan MacDonald
1971, Journal of Wildlife Management (35) 319-326
The mourning dove (Zenaidura macroura) call-count survey is a nationwide audio-census of breeding mourning doves. Recent analyses of the call-count routes have utilized a stratification based upon physiographic regions of the United States. An analysis of 5 years of call-count data, based upon stratification using potential natural vegetation, has demonstrated...
Radiometric age (Late Ordovician) of the Quincy, Cape Ann, and Peabody Granites from eastern Massachusetts
Robert E. Zartman, Richard F. Marvin
1971, Bulletin of the Geological Society of America (82) 937-957
A geochronologic study of several intrusive bodies of alkalic granite from eastern Massachusetts yields the following radiometric ages (in millions of years).Rock unitAmphibole K-ArWhole-rock Rb-Sr isochron ...
Nationwide study of the streamflow data program
R. W. Carter, M. A. Benson
1971, Journal of the American Water Resources Association (7) 383-385
During 1970 the Geological Survey conducted a study to evaluate the surface-water data collection program. Objectives were formulated, specific goals were set, a massive analysis of available data was made to determine the extent to which the present system enables the goals to be met, alternatives...
Petrologic and geophysical nature of serpentinites
Robert G. Coleman
1971, Bulletin of the Geological Society of America (82) 897-917
Mineralogically, serpentinites consist predominantly of lizardite, clinochrysotile, and antigorite. Recent work has shown that these minerals are not polymorphs. Chrysotile is the only mineral recognized as a synthetic product in experimental studies of the system MgO-SiO2-H2O. Antigorite seems to be stable at higher temperatures than lizardite or chrysotile. The density...
Correlation of uranium, thorium, and potassium with aeroradioaetivity in the Berea Area, Virginia
S.K. Neuschel, C. M. Bunker, C.A. Busa
1971, Economic Geology (66) 302-308
In the Berea area, a small quartz monzonite pluton intrudes chlorite-actinolite schist and is overlapped by Coastal Plain sand and gravel deposits. A detailed aeroradioactivity survey of the area shows unusually high radioactivity (1,150 counts per second) over the quartz monzonite. A total of 22 auger samples was taken across...
Gravitational sliding and the foreland thrust and fold belt of the North American Cordillera: Reply
Melville Rhodes Mudge
1971, Bulletin of the Geological Society of America (82) 1139-1140
No abstract available....
Elevation-relief ratio, hypsometric integral, and geomorphic area-altitude analysis
Richard J. Pike, Stephen E. Wilson
1971, Bulletin of the Geological Society of America (82) 1079-1083
Mathematical proof establishes identity of hypsometric integral and elevation-relief ratio, two quantitative topographic descriptors developed independently of one another for entirely different purposes. Operationally, values of both measures are in excellent agreement for arbitrarily bounded topographic samples, as well as for low-order fluvial watersheds. By...
Gold content of natural waters in Colorado
Arthur W. Gosling, E. A. Jenne, T. T. Chao
1971, Economic Geology (66) 309-313
Neutron activation analysis of 67 samples of water draining from gold-barren and gold-enriched sedimentary, igneous, and metamorphic rocks of the Colorado Front Range reveals a relatively small range in total gold content (nondetectable to 150 nanograms per liter). "Solute" gold concentrations were generally higher than...
Basin and range structure: A system of horsts and grabens produced by deep-seated extension
John H. Stewart
1971, Bulletin of the Geological Society of America (82) 1019-1043
Basin and Range structure can be interpreted as a system of horsts and grabens produced by the fragmentation of a crustal slab above a plastically extending substratum. According to this view, the extension...
The age of porphyry-type copper mineralization in the Bingham mining district, Utah — A refined estimate
William J. Moore, Marvin A. Lanphere
1971, Economic Geology (66) 331-334
No abstract available....
Flooded area of Lake St. Croix Beach, Minnesota
G.H. Carlson
1971, Report
No abstract available....
Sierra Nevada plutonic cycle: Part I, origin of composite granitic batholiths
R. W. Kistler, J. F. Evernden, H. R. Shaw
1971, Bulletin of the Geological Society of America (82) 853-868
Intrusion of Mesozoic batholiths in California and the western North America Cordillera began in the Late Triassic 210 m.y. ago and ended in the Late Cretaceous 80 m.y. ago. Emplacement of granitic rocks was apparently not continuous but was accomplished during five major epochs of...
Sierra Nevada plutonic cycle: Part II, tidal energy and a hypothesis for orogenic-epeirogenic periodicities
H. R. Shaw, R. W. Kistler, J. F. Evernden
1971, Bulletin of the Geological Society of America (82) 869-895
The dissipative power of the solid earth tides is the order of 1019 ergs/sec, or a few percent of terrestrial heat flow. It is proposed that this energy is concentrated along oceanic ridge systems and in the asthenosphere by mechanisms of viscous dissipation involving shear melting....
