Metamorphic history of a high-grade blueschist exotic block from the Franciscan complex, California
Diane E. Moore
1984, Journal of Petrology (25) 126-150
A high-grade blueschist tectonic block from the Franciscan Complex of the northeast Diablo Range shows evidence of three episodes of retrograde blueschist facies metamorphism ± deformation developed under progressively declining P-T conditions. The first retrograde metamorphism involved formation of an outer rind of actinolite + chlorite + rutile ± phengite, and...
TOPOLOGICAL STRUCTURING OF RASTER-SCANNED LINE MAP DATA.
Robin G. Fegeas, Richard A. Pearsall
1984, Conference Paper, Technical Papers of the American Congress of Surveying and Mapping
The U. S. Geological Survey has a requirement for the collection of large amounts of digital map data from existing graphic map separates. Prototype production techniques have been developed to capture line data from the map separates using a raster-scanning input device. After minimal editing in raster form, the data...
Moho orientation beneath central California from regional earthquake travel times
David H. Oppenheimer, Jerry P. Eaton
1984, Journal of Geophysical Research (89) 10267-10282
This paper examines relative Pn arrival times, recorded by the U. S. Geological Survey seismic network in central and northern California from an azimuthally distributed set of regional earthquakes. Improved estimates are presented of upper mantle velocities in the Coast Ranges, Great Valley, and Sierra Nevada foothills and estimates of...
Volcanic glasses, their origins and alteration processes
I. Friedman, W. Long
1984, Journal of Non-Crystalline Solids (67) 127-133
Natural glass can be formed by volcanic processes, lightning (fulgarites) burning coal, and by meteorite impact. By far the most common process is volcanic - basically the glass is rapidly chilled molten rock. All natural glasses are thermodynamically unstable and tend to alter chemically or to crystallize. The rate of...
Re-collection of Fish Canyon Tuff for fission-track standardization
C. W. Naeser, G. T. Cebula
1984, Nuclear Tracks and Radiation Measurements (1982) (10) 393
The PURPOSE of this note is to announce the availability of apatite and zircon from a third collection of the Oligocene Fish Canyon Tuff (FC-3). Apatite and zircon separated from the Fish Canyon Tuff have prove to be a useful standard for fission-track dating, both for interlaboratory comparisons and for...
Triple junction magmatism: a geochemical study of Neogene volcanic rocks in western California
C.M. Johnson, J. R. O’Neil
1984, Earth and Planetary Science Letters (71) 241-262
Inception of volcanism at late Oligocene to Recent centers in the eastern Coast Ranges of California (ECR suite) regularly decreases in age northward and is correlated with the northward migration of the transform-transform-trench Mendocino triple junction (MTJ). Miocene volcanism in the...
Drowned reefs as indicators of the rate of subsidence of the Island of Hawaii
J.G. Moore, D.J. Fornari
1984, Journal of Geology (92) 752-759
A major submerged terrace whose seaward edge is at about 150 m depth was investigated in 1983 during 10 dives with the Hawaii Undersea Research Laboratory (HURL) submersible Makali'i off Kealakekua Bay, Hawaii. The seaward termination of the terrace is a steep wall of reef limestone that extends from 150...
Analytical performance of a low-gas-flow torch optimized for inductively coupled plasma atomic emission spectrometry
A. Montaser, G.R. Huse, R.A. Wax, S.-K. Chan, D. W. Golightly, J. S. Kane, A. F. Dorrzapf Jr.
1984, Analytical Chemistry (56) 283-288
An inductively coupled Ar plasma (ICP), generated in a lowflow torch, was investigated by the simplex optimization technique for simultaneous, multielement, atomic emission spectrometry (AES). The variables studied included forward power, observation height, gas flow (outer, intermediate, and nebulizer carrier) and sample uptake rate. When the ICP was operated at...
Review of developments in space remote sensing for monitoring resources
Allen H. Watkins, D. T. Lauer, G. B. Bailey, D. G. Moore, W. G. Rohde
1984, Conference Paper
Space remote sensing systems are compared for suitability in assessing and monitoring the Earth's renewable resources. Systems reviewed include the Landsat Thematic Mapper (TM), the National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR), the French Systeme Probatoire d'Observation de la Terre (SPOT), the German Shuttle Pallet...
SPECTRAL REFLECTANCE OF THE CARBONATITE COMPLEXES AT MOUNTAIN PASS, CALIFORNIA AND IRON HILL, COLORADO.
Lawrence C. Rowan, Williams Collins, Marguerite J. Kingston, James K. Crowley
1984, Conference Paper
This paper describes the distinctive spectral reflectance of these two carbonatites and their related rocks, and also discusses the possible use of spectral reflectance measurements for exploring carbonatites. Laboratory spectra recorded in the 0. 4-2. 5 micrometer wavelength range showed absorption features discussed in the abstract. High spectral-resolution airborne radiance...
Geophysical investigation of a Suture Zone: The Border Ranges Fault of southern Alaska
M. A. Fisher, Roland E. von Huene
1984, Journal of Geophysical Research Solid Earth (89) 11333-11351
The Border Ranges fault separates structurally complex accreted Cretaceous rocks from less deformed middle or late Paleozoic and younger rocks in the Cook-Shelikof basin. Of the five types of geophysical data used to investigate this fault, gravity data give the clearest indication of its presence and crustal structure. For at...
Bedding types in Holocene tidal channel sequences, Knik Arm, Upper Cook Inlet, Alaska
S. Bartsch-Winkler, H. R. Schmoll
1984, Journal of Sedimentary Petrology (54) 1239-1250
Uplifted convoluted and horizontal to subhorizontal beds of varying thickness in intertidal silt as old as 3,280 + or - 90 yr B.P. are exposed in the banks of tidal channels of unknown depth in the intertidal zone in Knik Arm of Upper...
Calculations of seabird population recovery from potential oilspills in the mid-Atlantic region of the United States
William B. Samuels, A. Ladino
1984, Ecological Modelling (21) 63-84
Calculations were made of herring gull and common tern population recovery from potential oilspill damage in the U.S. mid-Atlantic Outer Continental Shelf (OCS) oil leasing area. Population recovery was examined using a density-dependent age-specific life history table for each species. Both a deterministic and a stochastic approach were used in...
Application of mineral-solution equilibria to geochemical exploration for sandstone-hosted uranium deposits in two basins in west central Utah
W. R. Miller, R. B. Wanty, J. B. McHugh
1984, Economic Geology (79) 266-283
A geochemical survey utilizing mainly ground waters was conducted in the Milford and Beaver basins. Waters were collected mainly from wells and springs at 100 sites and analyzed for major and minor elements. A computer model (WATEQ3) was used to calculate the redox potential and the state of saturation of...
ANALYSIS AND REDUCTION OF LANDSAT DATA FOR USE IN A HIGH PLAINS GROUND-WATER FLOW MODEL.
Gail Thelin, Leonard Gaydas, Walter Donovan, Carol Mladinich
1984, Conference Paper
Data obtained from 59 Landsat scenes were used to estimate the areal extent of irrigated agriculture over the High Plains region of the United States for a ground-water flow model. This model provides information on current trends in the amount and distribution of water used for irrigation. The analysis and...
Accretionary lapilli in altered tuffs associated with coal beds
B.F. Bohor, Don M. Triplehorn
1984, Journal of Sedimentary Petrology (54) 317-325
Accretionary lapilli have been identified in claystones (tonsteins) associated with coal beds of Late Cretaceous age in Wyoming, Utah, and New Mexico. The presence of accretionary lapilli in these tonstein partings confirms their volcanic origin. Similar concentric structures in other claystones not in...
Low-temperature heat capacities of CaAl2SiO6 glass and pyroxene and thermal expansion of CaAl2SiO6 pyroxene.
H.T. Haselton Jr., B. S. Hemingway, R. A. Robie
1984, American Mineralogist (69) 481-489
Low-T heat capacities (5-380 K) have been measured by adiabatic calorimetry for synthetic CaAl2SiO6 glass and pyroxene. High-T unit cell parameters were measured for CaAl2SiO6 pyroxene by means of a Nonius Guinier-Lenne powder camera in order to determine the mean coefficient of thermal expansion in the T range 25-1200oC. -J.A.Z....
Paleomagnetism in the Klamath Mountains, California and Oregon
William P. Irwin, Edward A. Mankinen, C. Sherman Gromme
D. G. Howell, D. L. Jones, A. Cox, A. Nur, editor(s)
1984, Stanford University Publications in Geological Science (18) 122-125
No abstract available....
The Jeanie Point complex revisited
Julie A. Dumoulin, Marti L. Miller
1984, Circular 868
The so-called Jeanie Point complex is a distinctive package of rocks within the Orca Group, a Tertiary turbidite sequence. The rocks crop out on the southeast coast of Montague Island, Prince William Sound, approximately 3 km northeast of Jeanie Point (loc. 7, fig. 44). These rocks consist dominantly of fine-grained...
Proton and metal ion binding to natural organic polyelectrolytes—I. Studies with synthetic model compounds
J.A. Marinsky, M.M. Reddy
1984, Organic Geochemistry (7) 207-214
A unified physico-chemical model, based on a modified Henderson-Hasselbalch equation, for the analysis of ion complexation reactions involving charged polymeric systems is presented and verified. In this model pH = pKa+p(ΔKa) + log(α/1 − α) where Ka is the intrinsic acid dissociation constant of the ionizable functional groups on the polymer, ΔKa is the deviation...
Geomagnetic paleointensities from excursion sequences in lavas on Oahu, Hawaii
Robert S. Coe, Sherman Gromme, Edward A. Mankinen
1984, Journal of Geophysical Research B: Solid Earth (89) 1059-1069
Paleomagnetic data demonstrating three late Tertiary excursions in the direction of the geomagnetic field recorded in sequences of basaltic lavas on the island of Oahu, Hawaii were published by R. R. Doell and G. B. Dalrymple in 1973. We have determined geomagnetic paleointensities by the Thelliers' method for 14 lavas...
Implications of paleomagnetism for the tectonic history of the Eastern Klamath and related terranes in California and Oregon
Edward A. Mankinen, William P. Irwin, C. Sherman Gromme
T. H. Nilsen, editor(s)
1984, Pacific Section S.E.P.M. (42) 221-229
Paleomagnetic study of Permian to Jurassic volcanic and sedimentary strata of the Eastern Klamath terrane has shown the remanent magnetism of these rocks to be prefolding and primary. The Permian and Triassic rocks are both indicated to have rotated 100° clockwise, while the Jurassic strata have rotated 60° clockwise. The...
Lithotectonic assemblages as portrayed on the new bedrock geologic map of Massachusetts.
Norman L. Hatch Jr., E-An Zen, Richard Goldsmith, Nicholas M. Ratcliffe, Peter Robinson, Rolfe S. Stanley, David R. Wones
1984, American Journal of Science (284) 1026-1034
Scale of 1:250,000. The map units are grouped into eight lithotectonic packages. Five "zones" of older rocks that cover the whole state are, from west to east, the Taconic-Berkshire, Rowe-Hawley, Bronson Hill, Nashoba, and Milford-Dedham. In central and western Massachusetts, these zones are overlain by the Connecticut Valley and Merrimack...
Resin rodlets in shale and coal (Lower Cretaceous), Baltimore Canyon Trough
P.C. Lyons, Patrick G. Hatcher, J.A. Minkin, C.L. Thompson, R.R. Larson, Z. A. Brown, R.N. Pheifer
1984, International Journal of Coal Geology (3) 257-278
Rodlets, occurring in shale and coal (uppermost Berriasian to middle Aptian, Lower Cretaceous), were identified from drill cuttings taken from depths between 9330 ft (2844 m) and 11, 460 ft (3493 m) in the Texaco et al., Federal Block 598, No....
Use of radar with a stationary antenna to estimate birds in a low-level flight corridor
C. E. Korschgen, W. L. Green, W.L. Flock, E.A. Hibbard
1984, Journal of Field Ornithology (55) 369-375
Abstract has not been submitted...
