Browsing ELibrary by Subject "ABSOLUTE AGE"
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Browsing ELibrary by Subject "ABSOLUTE AGE"
Now showing items 1-9 of 9
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(2001)Low-energy cosmic-ray neutrons play an important role in the production of the cosmogenic nuclides 36Cl and 41Ca. Previous approaches to modeling the distribution of low-energy neutrons beneath the surface of the earth ...
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(1999)We report here direct ion microprobe dating of fossil tooth (dentine) of a Permian fresh-water shark, Orthacanthus senckenbergianus using the SHRIMP instrument recently installed at Hiroshima University. Fifteen spots on ...
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ISOTOPIC SEARCH FOR LIVE 135CS IN THE EARLY SOLAR SYSTEM AND POSSIBILITY OF 135CS-135BA CHRONOMETER (2001)Here we report the isotopic excess of 135Ba studied from Ba isotopic measurements of acid leachates of Allende calcium-aluminum rich inclusions (CAIs) and two primitive chondrites, Beardsley (H5) and Zag (H6 clasts). From ...
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(1999)Marine carbonate skeletons like deep-sea corals are frequently coated with iron and manganese oxides/hydroxides which adsorb additional thorium and uranium out of the sea water. A new cleaning procedure has been developed ...
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(1996)Rb-Sr ages of melt inclusions in quartz have the potential to provide a unique and illuminating record of the differentiation and accumulation history of silicic magmas. Here we report the first Sr and Nd isotopic measurements ...
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(2001)Single crystal 40Ar/39Ar dating of K-feldspars from silicic volcanic rocks containing xenocrysts often yields a spectrum of ages slightly older than those of juvenile sanidine phenocrysts. In contrast, feldspars from thin, ...
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(2002)The concepts involved in the construction and interpretation of inverse isochron diagrams used in 40Ar/39Ar geochronology are reviewed. The diagrams can be useful as a means of recognising atmospheric argon and excess 40Ar, ...
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(2005)Рассмотрены петрография, геохимия, результаты датирования 40Аг/39Аг методом и геодинамические обстановки формирования вулканитов из разрезов скважин, пробуренных в последние годы в приуральской части Западно-Сибирской ...
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(2005)Методом 40Аr/39Аr датирования установлен раннекембрийский возраст грано диоритов, вскрытых в призабойной части (4824-5005 м) скв. Вездеходная-4 (Томская область) в юго-восточной части Западно- Сибирской геосинеклизы. ...
Now showing items 1-9 of 9