Plate-tectonic evolution of the western U.S.A.
W. Hamilton
1987, Episodes (10) 271-276
Changing interactions of lithospheric plates provide the framework for this review of the 3100 m.y. geological history of some 3 million km2 of mountains, deserts, plateaux and plains. The Precambrian to Neogene development of the western U.S.A. is outlined in terms of plate collisions, subduction events and deformation of lithospheric...
Evaluation of the 1985-1990 IGRF secular variation candidates
J.C. Cain, C. Kluth
1987, Physics of the Earth and Planetary Interiors (48) 362-378
The IGRF secular variation model for 1985-1990 was adopted by the International Association of Geomagnetism and Aeronomy at its Prague meeting in August 1985 as an average of the three candidate models submitted to the committee. We compared the three models at epoch 1985.0 against each other and against a...
Petrogenesis of gabbronorite at Yakobi and northwest Chichagof Islands, Alaska
G. R. Himmelberg, R. A. Loney, P.I. Nabelek
1987, Geological Society of America Bulletin (98) 265-279
On Yakobi Island and at Mirror Harbor on the northwest coast of Chichagof Island, gabbronorite occurs as irregular bodies, as much as 5.5 km in maximum dimension, mostly within a 40 to 43 m.y. composite pluton consisting largely of tonalite. The gab-bronorites are the host rocks for a magmatic nickel-copper...
NONHOMOGENEOUS TERMS IN THE UNSTEADY FLOW EQUATIONS: MODELING ASPECTS.
Chintu Lai, Raymond W. Schaffranek, Robert A. Baltzer
1987, Conference Paper
A study is in progress to identify the relative significance, effects, and benefits attributable to the use of one-dimensional, unsteady, open-channel, flow-simulation models employing a variety of nonhomogeneous terms in their equation formulations. Nonhomogeneous terms being analyzed include those representing bed slope, frictional resistance, nonprismatic channel geometry, lateral flow, and...
The ubiquitous ostracode Darwinula stevensoni (Brady and Robertson, 1870), redescription of the species and lectotype designation.
I. G. Sohn
1987, Micropaleontology (33) 150-163
Darwinula stevensoni (Brady and Robertson 1870) is the type species of Darwinula, the ubiquitous living and fossil nonmarine nominate genus of the Darwinulidae and the Darwinulacea. To date, the additional families Darwinuloididae (fossil), Microdarwinulidae (living and fossil), Panxianidae (fossil), and Suchonellidae (fossil) have been referred to the Darwinulacea. A type...
HYDROBIOLOGICAL CHARACTERISTICS OF THE COASTAL LAGOONS AT HUGH TAYLOR BIRCH STATE RECREATION AREA, FORT LAUDERDALE, FLORIDA: A HISTORICAL PERSPECTIVE.
Robert J. Brock
1987, Conference Paper, Oceans Conference Record (IEEE)
The author presents initial results of an ongoing study of Southeast Florida coastal lagoon lakes. Objectives include presenting environmental conditions within and adjacent to the lagoons under a variety of hydrologic conditions and to determine water-quality changes in ground water and surface water and how these changes in water quality...
Carbon and sulfur relationships in Devonian shales from the Appalachian Basin as an indicator of environment of deposition
Joel S. Leventhal
1987, American Journal of Science (287) 33-49
No abstract available....
Confirmation of the empirical correlation of Al in hornblendes with pressure of solidification of calc-alkaline plutons: comment on miscorrelation of plutons.
D. A. Brew, A. B. Ford
1987, American Mineralogist (72) 1017
The distinction between Carlson Creek pluton and the Speel River-Fords Terror sill or pluton is clarified. (A.M. 72-231). -J.A.Z....
Thermodynamics of aragonite-strontianite solid solutions: Results from stoichiometric solubility at 25 and 76°C
Niel Plummer, E. Busenberg
1987, Geochimica et Cosmochimica Acta (51) 1393-1411
Dissolution of synthetic strontianite-aragonite solid solutions was followed analytically to stoichiometric saturation using large solid to solution ratios in CO2-H2O solution at 25 and 76°C. The compositional dependence of the equilibrium constant was calculated from the composition of saturated (stoichiometric) solutions and used to calculate the activities and activity...
Analysis of two-color geodimeter measurements of deformation within the Long Valley caldera: June 1983 to October 1985
J. Langbein, M. Linker, D. Tupper
1987, Journal of Geophysical Research Solid Earth (92) 9423-9442
Line length changes from several baselines in a trilateration network within the Long Valley caldera clearly define a decrease in strain rate from June 1983 through October 1985. The data consist of more than 1600 length measurements on 23 baselines using a two-color geodimeter, which has a precision of 0.2...
GEOMETRIC PROCESSING OF DIGITAL IMAGES OF THE PLANETS.
Kathleen Edwards
1987, Photogrammetric Engineering and Remote Sensing (53) 1219-1222
New procedures and software have been developed for geometric transformations of images to support digital cartography of the planets. The procedures involve the correction of spacecraft camera orientation of each image with the use of ground control and the transformation of each image to a Sinusoidal Equal-Area map projection with...
The chemistry and mineralogy of haloed burrows in pelagic sediment at DOMES Site A: The equatorial North Pacific
D.Z. Piper, P.D. Rude, S. Monteith
1987, Marine Geology (74) 41-55
The chemical and mineralogical composition of burrowed sediment, recovered in 66 box cores at latitude 9°25′N and longitude 151°15′W in the equatorial Pacific, demonstrates the important role of infauna in determining the geochemistry of pelagic sediment. Haloed burrows, approximately 3 cm...
Radium-226 contents and Rn emanation coefficients of particle-size fractions of alkaline, acid and mixed U mill tailings
E. R. Landa
1987, Health Physics (52) 303-310
[No abstract available]...
Analysis of extraordinary flood events. U.S.-China bilateral symposium
E.W.H. Kirby, Hua Shi-Qian, L.R. Beard
1987, Journal of Hydrology (96)
The symposium took place in Nanjing on 15-19 October 1985 and this volume contains 29 of the 52 papers presented, most of the authors coming either from China or the USA. The articles are organized into three major topics: 1) detection of historical floods and evaluation of the uncertainties in...
DIGITAL CARTOGRAPHY OF THE PLANETS: NEW METHODS, ITS STATUS, AND ITS FUTURE.
R. M. Batson
1987, Photogrammetric Engineering and Remote Sensing (53) 1211-1218
A system has been developed that establishes a standardized cartographic database for each of the 19 planets and major satellites that have been explored to date. Compilation of the databases involves both traditional and newly developed digital image processing and mosaicking techniques, including radiometric and geometric corrections of the images....
A model for tides and currents in the English Channel and southern North Sea
Roy A. Walters
1987, Conference Paper, Advances in Water Resources
The amplitude and phase of 11 tidal constituents for the English Channel and southern North Sea are calculated using a frequency domain, finite element model. The governing equations - the shallow water equations - are modifed such that sea level is calculated using an elliptic equation of the Helmholz type...
Geological hazards: programs and research in the USA
J.R. Filson
1987, Episodes (10) 292-295
Geological hazards have been studied for centuries, but government support of research to lessen their effects is relatively new. This article briefly describes government programs and research under way in the U.S.A. that are directed towards reducing losses of life and property from earthquakes, volcanic eruptions and landslides. -Author...
LOUISIANA BARRIER ISLAND EROSION STUDY.
Sallenger Jr., Shea Penland, S. Jeffress Williams, John R. Suter
1987, Conference Paper
During 1986, the U. S. Geological Survey and the Louisiana Geological Survey began a five-year cooperative study focused on the processes which cause erosion of barrier islands. These processes must be understood in order to predict future erosion and to better manage our coastal resources. The study area includes the...
SAND SOURCES FOR THE TRANSGRESSIVE BARRIER COAST OF LONG ISLAND, NEW YORK: EVIDENCE FOR LANDWARD TRANSPORT OF SHELF SEDIMENTS.
S.J. Williams, E.P. Meisburger
1987, Conference Paper
During investigations of the regional geologic framework of Long Island shelf by means of seismic-reflection profiles and cores, Williams (1976) identified a rather limited area on the shelf off Jones Beach where Upper Cretaceous or early Tertiary age glauconite-rich lithosomes subcrop at the seabed, seaward of the shoreface. A suite...
Seismic response of dam with soil‐structure interaction
G.N. Bycroft, P. N. Mork
1987, Journal of Engineering Mechanics (113) 1420-1428
An analytical solution to the response of a long trapezoidal‐section dam on a foundation consisting of an elastic half‐space and subjected to simulated earthquake morion is developed. An optimum seismic design is achieved when the cross section of the dam is triangular. The effect of soil structure interaction is to...
The geochemistry of water near a surficial organic-rich uranium deposit, northeastern Washington State, U.S.A.
R. A. Zielinski, J. K. Otton, R. B. Wanty, C. T. Pierson
1987, Chemical Geology (62) 263-289
The chemistry of three stream, three spring and six near-surface waters in the vicinity of a Holocene organic-rich uranium deposit is described, with particular emphasis on the chemistry of U. Results characterize the solution behavior of uranium as U-bearing water interacts with relatively undecomposed, surficial organic matter. Of the measured...
Genesis of marine terrace soils, Barbados, West Indies: evidence from mineralogy and geochemistry
D.R. Muhs, R.C. Crittenden, J.N. Rosholt, C. A. Bush, K. C. Stewart
1987, Earth Surface Processes and Landforms (12) 605-618
Well-developed, clay-rich soils dominated by interstratified kaolinite-smectite are found on the uplifted coral reef terraces on the island of Barbados. The reef limestone is unlikely to have been the soil parent material however, because it is 98% CaCO 3 and geomorphic evidence argues against the 20 m of reef solution...
Diffusivity of a glacial-outwash aquifer by the floodwave- response technique
R.J. Reynolds
1987, Groundwater (25) 290-299
Aquifer diffusivity (transmissivity divided by storage coefficient) was calculated for three sites in a glacial-autwash valley aquifer near Cortland, New York from water-level fluctuations induced by rises in stream stage. The observed response data were analyzed through use of a one-dimensional floodwave-response model to calculate the theoretical head response in...
Seismicity map of the state of Florida
B. Glen Reagor, Carl W. Stover, Sylvester Theodore Algermissen
1987, Miscellaneous Field Studies Map 1056
This map is one of a series of seismicity maps produced by the U. S. Geological Survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000. This map shows only those earthquakes with epicenters located within the boundaries of Florida, even though earthquakes...
Estimating generalized skew of the log-Pearson Type III distribution for annual peak floods in Illinois
Kevin A. Oberg, Dean M. Mades
1987, Water-Resources Investigations Report 86-4008
Four techniques for estimating generalized skew in Illinois were evaluated: (1) a generalized skew map of the US; (2) an isoline map; (3) a prediction equation; and (4) a regional-mean skew. Peak-flow records at 730 gaging stations having 10 or more annual peaks were selected for computing station skews. Station...
