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Now showing items 7651-7670 of 39004
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(2005)We conducted a year-long, intensive monitoring program of live aquatic gastropods (Helisoma duryi, Melanoides tuberculata, Physa virgata, Pyrgulopsis sp., and Tyronia sp.) and their host springs in the Ash Meadows National ...
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(PANGAEA, 2009-07-11)Isotopic-geochemical study revealed presence of mantle He (3He/4He up to 223x10**-8) in gases from mud volcanoes of Eastern Georgia. This fact confirms that the Middle Kura basin fill encloses an intrusive body previously ...
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(1997)The cause of the nitrogen isotopic anomalies observed by Hashizume and Sugiura (1995) among bulk equilibrated ordinary chondrites has been investigated. The bulk nitrogen isotopic anomalies can be explained by the isotopically ...
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(2002)Hydrogen isotopic exchangeability (Hex) and δDn values of non-exchangeable organic hydrogen were investigated in coal kerogens ranging in rank from lignite to graphite. The relative abundance of Hex is highest in lignite ...
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(2001)Diagenetic incorporation of uranium into bone material establishes a U-Pb system that provides a minimum age for the fossil. Loss of Rn and Ra from the 238U-decay series, recent mobility of U and Pb, and incorporation of ...
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(1997)The evaluation of the economic importance of bacterial methane is still a matter of discussion, linked to the evolution of the geochemical understanding. Methane occurrence or accumulations with light isotopic ratios, both ...
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(1996)We present a new approach for the rationalization of trace element partitioning between silicate melts and minerals, which is not based on the empirical, parameterised continuum models in common use. We calculate the ...
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(PANGAEA, 2010-06-14)
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(2003)Spherical objects, identified as microfossils and named Isuasphaera isua (Pflug), were reported in 1978 from a chert in the 3.7-3.8Ga Isua Greenstone Belt (IGB). Soon afterwards the biological nature of these objects was ...
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(2006)Itatodon tatarinovi Lopatin et Averianov, 2005 известен по двум нижним молярам и фрагменту нижнего моляра из верхней части итатской свиты (батский ярус) Березовского карьера на юге Красноярского края. По наличию псевдоталонида, ...
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(2000)The 1989 IUGS classification of the igneous rocks for the high-Mg and picritic volcanic rocks has been revised. Instead of an 18 wt % MgO minimum limit being applied for all high-Mg and picritic volcanic rocks, that is now ...
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(2017)
Now showing items 7651-7670 of 39004