Geophysical Abstracts, الأعداد 282-287Geological Survey, 1970 |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
13 Natl Absolute age Acad Aeromagnetic series airborne Akad amplitude analysis andesites anomalies Atlantic Ocean Author's abstract Authors basalts basin Canada Canada Geological Survey chondrites composition continental drift correlation craters crust and upper crustal curves deep deformation density deposits depth determined Earth Earth's crust earthquakes Elastic waves electrical English abs English summ explosions fault formation fracture frequency Geol Geologiya geomagnetic Geophysical surveys granitic gravimeter heat flow illus Inst interpretation investigations Island isotopic Japan Jour layer logging lunar magnetic field magnetotelluric measurements metamorphism meteorites method minerals observed obtained Ocean Otdeleniye P-waves paleomagnetic parameters Precambrian problem Quaternary radioactivity ratio Rayleigh waves region Ridge rocks samples sedimentary sediments seismic waves seismograms Seismology stress structure studies surface Survey Geophysics Paper tables techniques tectonic tektites temperature thermal thickness tion U.S. Geological Survey Union Geophys upper mantle variations velocity vertical volcanic Zemli zone
مقاطع مشهورة
الصفحة 951 - Weyl, Peter K. Oceanography, an introduction to the marine environment: New York and London, John Wiley and Sons, 535 p., illus., 1970.
الصفحة 1017 - The geopotential of the earth is represented by the potential of a simple layer distributed over the earth's surface.
الصفحة 1127 - M2 and u , have shed light on the long-standing problem of the indirect influence of ocean tides on the solid-earth tide. The profile consists of nine observational stations distributed almost evenly around latitudes 39 to 41 degrees north across the United States. The observed values of the gravimetric factor and the phase were found to depend on the tidal characteristics of the Atlantic and Pacific oceans. There is no observable correlation between tidal gravity parameters and the regional geology....
الصفحة 955 - Gamma -ray systems that have a wide range response are required for uranium exploration. Low-grade ore bodies with marginal economic feasibility are particularly dependent on reliable, calibrated gamma-ray logs.
الصفحة 1181 - Different species of benthic Foraminifera taken at the same level in an Atlantic core yielded different oxygen isotopic values. It was therefore impossible to deduce paleotemperature values. In addition, pelagic and benthic species showed the same isotopic variations, an indication that pelagic and benthic species reflect only the variation of oxygen- 18 composition of the ocean. — Authors' abstract 285-317 Bray, JR Solar activity index — Validity supported by oxygen isotope dating: Science,...
الصفحة 955 - X-ray fluorejcence drill hole probe of prototype design Is described. The main potential application of such an instrument is for logging uncased and preferably dry drill holes in metalliferous ore deposits; for example, to locate cut-off horizons during development mining operations. A double scintillation detector arrangement is used, with balanced filters. The geometry of the source-detector assembly pays high regard to the importance of cylindrical symmetry and utilizes a simple design and inexpensive...
الصفحة 807 - Glass spherules show multiple high velocity impact craters and are coated with small particles including glass, plagioclase, clinopyroxene, ilmenite, olivine, chromite, rock fragments and frozen droplets of iron, nickel-iron and troilite. These spherules passed through an impact-generated cloud of hot fragmental material, molten iron and iron sulfide droplets and high velocity projectiles. Lunar breccia contains concentric, accretionary lapilli units. Breccia is not shock...
الصفحة 941 - Multifrequency radar systems can be used in an all-weather dayand night program for producing imagery from which reconnaissance maps and larger-scale maps, as well as statistical data, can be derived. Continued monitoring over a period of time can produce significant information relating to mass budget of the ice, calving rates and seasonal limits of pack ice, depth of pack ice, the annual progress of freezeup and breakup of Antarctic seas, development and persistence of fracture and crevasse patterns,...
الصفحة 857 - Nalwalk, AJ, 1970. K, Rb, Cs, and Sr relationships in submarine basalts from the Puerto Rico trench. Geochim. Cosmochim. Acta, 34: 145—155.
الصفحة 1013 - International Conference on Stratigraphy and Structure bearing on the origin of the North Atlantic Ocean, Gander, Newfoundland, August 24-30, 1967.