Short Papers of the Fourth International Conference, Geochronology, Cosmochronology, Isotope Geology, 1978 |
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عبارات ومصطلحات مألوفة
abundance activity amount analysis apparent argon basalts biotite calculated California carbon chemical chondrites close complex concentrations constant contain correlation crystallization dating deposits determined Earth Earth and Planetary effects elements estimated event evidence Figure fission fission-track formation formed fractionation gases Geological give gneisses granite higher inclusions indicate initial intrusion island isochron isotopic composition Italy Journal K-Ar lead less lower magma major mantle mass material measured melting metamorphism meteorites method minerals natural observed obtained occur oceanic origin oxygen pattern percent permil phases Planetary Science Letters Pleistocene plot plutons points possible present produced range ratios Rb-sr region relative reported represent Research rocks samples sediments separated shown similar South standard studies suggest temperature thermal tion track University upper uranium values variations volcanic zircon zone
مقاطع مشهورة
الصفحة iii - The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the US Geological Survey For additional information write to: District Chief US Geological Survey 333 W.
الصفحة 178 - Sun, SS, and Hanson, GN, 1975. Origin of Ross Island basanitoids and limitations upon the heterogeneity of mantle sources for alkali basalts and nephelinites.
الصفحة 111 - normal segments" of the Reykjanes Ridge, 60°-53°N, MidAtlantic Ridge, 29°S, and East Pacific Rise, 2°-19°S, and evidence on the composition of the underlying lowvelocity layer. J.
الصفحة 175 - Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
الصفحة 137 - Banno, S., 1973. Garnet-orthopyroxene and orthopyroxene-clinopyroxene relationships in simple and complex systems.
الصفحة 418 - ROSHOLT JN, DOE BR and TATSUMOTO M. (1966) Evolution of the isotopic composition of uranium and thorium in soil profiles.
الصفحة 400 - Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA t Mineralogy Department, British Museum (Natural History), Cromwell Road, London SW7 5BD, UK.
الصفحة 462 - O'Nions, RK and Pankhurst, RJ, 1974. Petrogenetic significance of isotope and trace element variations in volcanic rocks from the Mid-Atlantic.
الصفحة 78 - Broecker, WS (1975) Oxygen isotope and cation composition of DSDP pore waters and the alteration of layer II basalts. Earth and Planetary Science Letters 27, 1-10.
الصفحة 51 - GENTNER W., KLEINMANN B. and WAGNER GA (1967) New K-Ar- and fission track ages of impact glasses and tektites. Earth Planet. Sci. Lett. 2, 83-86.