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Page 4270, results 106726 - 106750

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Incorporation and redistribution of locally derived lithic fragments within a pyroclastic flow
D.C. Buesch
1992, Geological Society of America Bulletin (104) 1193-1207
The lower Miocene Peach Springs Tuff exposed in the Newberry Mountains, California, was deposited within a paleovalley trending S65°W. Exposures within the paleovalley contain lithic breccia intercalated with ash-rich ignimbrite. The clast assemblage of the lithic breccias matches the rock types of the paleovalley walls, and therefore the clasts were...
Computer simulation of dry layered granular flow down an incline composed of grains
Chi-Hai Ling, Chyan-Deng Jan
1992, Conference Paper, Proceedings of Engineering Mechanics
Experiments show that gravity-driven dry granular flows are essentially layered for smooth spheres. This paper describes layer-to-layer interaction in the flow. Assuming two-dimensional flow and neglecting the interaction of grains within the same layer, one may idealize the problem as an elastic sphere under external forces moving down an incline...
Comparative gas exchange characteristics of potted, glasshouse-grown almond, apple, fig, grape, olive, peach and Asian pear
S. S. Higgins, F. E. Larsen, R. B. Bendel, G. K. Radamaker, J. H. Bassman, W. R. Bidlake, A. A. Wir
1992, Scientia Horticulturae (52) 313-329
Net photosynthesis (Pn), dark respiration (Rd), transpirational flux density (TFD) and leaf conductance (kl) on glasshouse-grown plants of almond, apple, fig, grape, olive, peach and Asian pear were examined under various laboratory environmental conditions. Grape and almond had the highest light-saturated photosynthetic rates, greater than 20 μmol CO2 m−2 s−1. Apple had...
Metallogeny of the midcontinent rift system of North America
S. W. Nicholson, W.F. Cannon, K. J. Schulz
1992, Precambrian Research (58) 355-386
The 1.1 Ga Midcontinent rift system of North America is one of the world's major continental rifts and hosts a variety of mineral deposits. The rocks and mineral deposits of this 2000 km long rift are exposed only in the Lake Superior region. In the Lake Superior region, the...
Campanian ammonites from the Upper Cretaceous Gober Chalk of Lamar County, Texas
W. A. Cobban, W. J. Kennedy
1992, Journal of Paleontology (66) 440-454
The Roxton Limestone Member at the top of the Gober Chalk in northeast Texas yields a rich fauna, dominated by Baculites haresi Reeside, 1927, and Inoceramus balticus Boehm, 1909, with sparse occurrences of pachydiscus cf. P. paulsoni (Young, 1963), Anapachydiscus sp.juv., Placenticeras placenta (DeKay, 1828), Hoplitoplacenticeras aff. H. plasticum (Paulcke,...
Net Late Holocene emergence despite earthquake-induced submergence, south-central Chile
B.F. Atwater, H.J. Nunez, C. Vita-Finzi
1992, Quaternary International (15-16) 77-85
Intertidal deposits show net Late Holocene emergence at three sites along the Pacific coast near Maulli??n and Carelmapu, Chile (latitude 41.6-41.7??S.). The maximum amount of net emergence is ca. 1 m in the past 1500 years and ca. 2 1 2 m in the past 4000 years. Emergence probably would...
Experimental study of iron-chloride complexing in hydrothermal fluids
J.B. Fein, J.J. Hemley, W. M. d’Angelo, A. Komninou, D.A. Sverjensky
1992, Geochimica et Cosmochimica Acta (56) 3179-3190
Mineral assemblage solubilities were measured in cold-seal pressure vessels as a function of pressure, temperature, and potassium chloride concentration in order to determine the nature and thermodynamic properties of iron-chloride complexes under hydrothermal conditions. The assemblage pyritepyrrhotite-magnetite was used to buffer &#x192;S2">ƒS2 and <span...
Highlights of the 13 March 1992 Erzincan (Turkey) earthquake
Mehmet Çelebi
1992, Conference Paper, NIST Special Publication
The March 13, 1992 Ms = 6.8 Erzincan earthquake in Turkey is highlighted here. The epicenter of this earthquake was located 7.7 km from the eastern end of the North Anatolian fault. The strong motions recorded in Erzincan had peak ground accelerations of approximately 0.5 g, accompanied by a pulse...
Sulfur isotopic disequilibrium and fluid-rock interaction during metamorphism of sulfidic black shales from the Waterville-Augusta area, Maine, USA
N.H.S. Oliver, T.C. Hoering, T.W. Johnson, D. Rumble III, Wayne C. Shanks III
1992, Geochimica et Cosmochimica Acta (56) 4257-4265
Sulfur isotope ratios of pyrite (py) and pyrrhotite (po) from regionally metamorphosed graphitic sulfidic schists and related rocks from south-central Maine, USA, were analysed using SO2 and SF6 techniques. There is a broad range in δ34S values for both pyrite and pyrrhotite at most outcrops, up to 8%. and overall the values...
Planktonic foraminiferal assemblage of the Yorktown Formation, Virginia, USA
H.J. Dowsett, L.B. Wiggs
1992, Micropaleontology (38) 75-86
Planktonic foraminifers from Coastal Plain deposits in southeastern Virginia provide biochronologic control and paleoceanographic information for the lectostratotype of the Yorktown Formation and type localities of its four members. Faunas recovered from six localities are consistent with faunas reported from the Yorktown in North Carolina and Yorktown correlatives (Duplin and...
An Appalachian isochron: A kaolinized Carboniferous air-fall volcanic-ash deposit (tonstein)
P.C. Lyons
1992, Geological Society of America Bulletin (104) 1515-1527
The Fire Clay tonstein is a kaolinized, airfall volcanic ash bed that was deposited in a widespread late Carboniferous peat-forming mire. Eleven samples from Kentucky and West Virginia, spanning a distance of 200 km, and two samples from Tennessee and Virginia indicate a characteristic mineralogical signature, as compared with other...
High-temperature heat capacity of Co3O4 spinel: thermally induced spin unpairing transition
K. Mocala, A. Navrotsky, David M. Sherman
1992, Physics and Chemistry of Minerals (19) 88-95
A strong anomaly was found in the heat capacity of Co3O4 between 1000 K and the decomposition temperature. This anomaly is not related to the decomposition of Co3O4 to CoO. The measured entropy of transition, ??S=46??4 J mol-1 K-1 of Co3O4, supports the interpretation that this anomaly reflects a spin...
Differential unroofing within the central metasedimentary Belt of the Grenville Orogen: constraints from 40Ar/39Ar thermochronology
M. A. Cosca, E.J. Essene, Michael J. Kunk, J. F. Sutter
1992, Contributions to Mineralogy and Petrology (110) 211-225
An 40Ar/39Ar thermochronological investigation of upper greenschist to granulite facies gneiss, amphibolite and marble was conducted in the Central Metasedimentary Belt (CMB), Ontario, to constrain its cooling history. Incremental 40Ar/39Ar release spectra indicate that substantial differential unroofing occurred in the CMB between ??? 1000 and ??? 600 Ma. A consistent...
Duck virus enteritis
D. E. Docherty, J. C. Franson
A.E. Castro, W.P. Heuschele, editor(s)
1992, Book chapter, Veterinary diagnostic virology: A practitioner's guide
No abstract available....
Volcanic geology and eruption frequency, lower east rift zone of Kilauea volcano, Hawaii
R. B. Moore
1992, Bulletin of Volcanology (54) 475-483
Detailed geologic mapping and radiocarbon dating of tholeiitic basalts covering about 275 km2 on the lower east rift zone (LERZ) and adjoining flanks of Kilauea volcano, Hawaii, show that at least 112 separate eruptions have occurred during the past 2360 years. Eruptive products include spatter ramparts and cones, a shield,...
Reproductive implications of egg-size variation in Black Brant
Paul L. Flint, James S. Sedinger
1992, The Auk (109) 896-903
We analyzed variation in egg size of Black Brant (Branta bernicla nigricans) in relation to clutch size, laying date, female age, year, and position in the laying sequence. A total of 3,478 eggs was measured over three years. Egg size increased with clutch size and female age, and decreased with...
Organizational changes at Earthquakes & Volcanoes
David W. Gordon, editor(s)
1992, Earthquakes & Volcanoes (USGS) (23) 4-4
Primary responsibility for the preparation of <i>Earthquakes & Volcanoes</i> within the Geological Survey has shifted from the Office of Scientific Publications to the Office of Earthquakes, Volcanoes, and Engineering (OEVE). As a consequence of this reorganization, Henry Spall has stepepd down as Science Editor for <i>Earthquakes & Volcanoes(E&V)</i>....
Functional response and capture timing in an individual-based model: predation by northern squawfish (Ptychocheilus oregonensis) on juvenile salmonids in the Columbia River
James H. Petersen, Donald L. DeAngelis
1992, Canadian Journal of Fisheries and Aquatic Sciences (49) 2551-2565
The behavior of individual northern squawfish (Ptychocheilus oregonensis) preying on juvenile salmonids was modeled to address questions about capture rate and the timing of prey captures (random versus contagious). Prey density, predator weight, prey weight, temperature, and diel feeding pattern were first incorporated into predation equations analogous to Holling Type...