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Now showing items 7685-7704 of 40116
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(2003)Comparison of initial Pb-isotope signatures of several early Archaean (3.65–3.82 Ga) lithologies (orthogneisses and metasediments) and minerals (feldspar and galena) documents the existence of substantial isotopic heterogeneity ...
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(1996)The occurrence of inherited radiogenic Pb components in 35 Ma old magmatic titanite is reported here for the first time. The about 810 Ma age of the inherited components is identical to that contained in zircon from the ...
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(1997)Following Shiraki and Brantley (1995), who found different growth mechanisms for calcite crystal growth at 100°C and 100 bars total pressure, we investigated the inhibition of calcite crystal growth by Mg2+ under the same ...
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INHIBITION OF CALCITE PRECIPITATION BY ORTHOPHOSPHATE: SPECIATION AND THERMODYNAMIC CONSIDERATIONS (2006)The inhibition of heterogeneous calcite precipitation by orthophosphate was investigated under four different solution compositions using a pH-stat system. The system composition was designed to maintain a constant degree ...
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(2003)Zircons from the Simmern H5 chondrite and Pomozdino eucrite have been analyzed for their Hf-W isotope systematics. Zircons have high intrinsic Hf contents and coupled with low W, make them ideal Hf-W chronometers. However, ...
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(2004)We report 26 Mg excesses correlated with Al/Mg ratios in five chondrules from the primitive CO3.0 chondrite Yamato 81020 that yield a mean initial 26 Al/27 Al ratio of only (3.8 ± 0.7) * 10-6 , about half that of ordinary ...
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(1999)The alteration mechanism and rate of three aluminosilicate glasses were investigated experimentally in aqueous media between 90 and 200°C. In order to assess their containment properties with regard to minor actinides for ...
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(1999)Data are presented on the Kurga polyphase intrusion, which is located within the Kola alkaline province in the northeastern Baltic Shield. The rock assemblages composing the intrusion are demonstrated to be unique to the ...
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(1997)Mechanisms of sulfide mineral oxidation have been a subject of long-standing interest because of their importance in many industrial, geochemical and environmental processes. Atomic-resolution scanning tunneling microscopy ...
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(2005)We analyzed 17 fragments from a zoned allanite–epidote crystal (ca 2.2mm 4.0mm), which had formed during different prograde and retrograde stages of ultra high pressure (UHP) and amphibolite facies metamorphism (240–230Ma, ...
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(PANGAEA, 1987-05-30)The DSDP Leg 87 expedition was dedicated to drilling active margins and was designed to investigate two very different regions: the Nankai Trough and the Japan Trench. The broad objective was to study the location, directions, ...
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(2006)Carbonate-rich sediments at shoal to shelf depths (<200 m) represent a major CaCO3 reservoir that can rapidly react to the decreasing saturation state of seawater with respect to carbonate minerals, produced by the increasing ...
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(2003)Tonga and Mariana forearc peridotites, inferred to represent their respective subarc lithospheres, are compositionally highly depleted (low Fe/Mg) and thus physically buoyant relative to abyssal peridotites representing ...
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INJECTIVE STRUCTURES AND GOLD-SILVER MINERALIZATION OF THE POKROVSK ORE FIELD (AMUR REGION, RUSSIA) (2003)It is shown that the formation of the Pokrovsk ore field structure is related to injective processes that occurred repeatedly in the Umlekan-Ogodzha volcano-plutonic belt during the Late Mesozoic. This is confirmed by the ...
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(1995)The diffusion of the dynamo-generated magnetic field into the electrically conducting inner core of the Earth may provide an explanation for several problematic aspects of long-term geomagnetic field behavior. We present ...
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(2001)This paper reviews recent research focused on the Earth's inner core. Large inner-core traveltime anomalies and the anomalous splitting of core-sensitive free oscillations strongly suggest that the inner core is anisotropic. ...
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(2004)An integrated inoceramid-foraminiferal zonation for the topmost Turonian and Lower Coniacian near Briansk, SW of Moscow is presented. The inoceramid fauna enables the application of the refined zonal scheme currently applied ...
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(2006)JGOFS results showed that the ocean is a major sink for the increasing atmospheric carbon dioxide resulting from human activity. However, the role of the coastal seas in the global carbon cycling is poorly understood. In ...
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Inorganic nitrogen uptake by Black Sea microplankton in connection with hydro chemical conditions. (PANGAEA, 1994-08-04)To study inorganic nitrogen uptake rates by microplankton in the Black Sea the first 15N-experiments were carried out in August-September 1990 and in November 1991. In surface waters nitrate uptake rates varied from 5.7 ...
Now showing items 7685-7704 of 40116