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Browsing Геология России by Title
Now showing items 8365-8384 of 39195
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(2004)It may be difficult to isolate stable palaeomagnetic vectors of different ages if they lie in grain assemblages with overlapping ranges of coercivity or of unblocking temperature. This is because some moments associated ...
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(1999)Early Cambrian sediments on the East European platform in North Estonia, represented mostly by clays and silty clays, were deposited under normal marine conditions. The sediments were never affected by significant tectonic ...
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(2001)The heat capacity of synthetic pentlandite Fe4.60Ni4.54S8 was measured over the temperature range 6-306 K. Experimental values of Cp (T) indicate that there are no phase transitions. The thermodynamic functions Cp (T), ...
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(2001)The temperature dependence of strontianite SrCO3(c) heat capacity was determined within the range 0-336 K. It was measured within 22.13-336.94 K and calculated below 22.13 K. The experimental data were approximated with ...
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(2001)The heat capacity of witherite BaCO3 (c) as a function of temperature was experimentally studied in the interval 20.03-338.81 K and was calculated for temperatures below 20.03 K. At 298.15 K, the standard heat capacity, ...
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(1998)Titanium substitution has a significant effect on the temperature dependence (5-300 K) of low-temperature saturation remanence and of initial susceptibility in synthetic and natural titanomagnetite (Fe3-xTixO4, 0=<x<0.7). ...
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(2002)Hysteresis loops have been measured as a function of temperature between 10 K and room temperature for two samples of pseudo-single-domain magnetite. One sample, with mean grain size of 2-3 μm, displays just surface ...
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LOW-TEMPERATURE MAGNETIZATION AND AC SUSCEPTIBILITY OF MAGNETITE: EFFECT OF THERMOMAGNETIC HISTORY (2003)Saturation isothermal remanent magnetization (SIRM) and AC susceptibility have been measured as a function of temperature between 5 K and room temperature for one multidomain and three pseudo-single-domain magnetite samples ...
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(2003)The Middle Paleozoic Maksyutov Complex is an important component of the Eurasian collisional orogeny. It consists of dominant mica-rich garnet schist and mica-poor quartzofeldspathic gneiss enclosing minor mafic eclogite ...
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(2001)Manganese oxide-hydroxide compounds were synthesized under low temperature conditions (3-22°C). They are represented by X-ray amorphous and crystalline compounds. The latter consist of minerals with layered crystal structures ...
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(1997)The microstructure of the outer taenite rim and cloudy zone of meteoritic metal was investigated using high resolution scanning electron microscopy and analytical electron microscopy. The microstructure is formed by a ...
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LOW-TEMPERATURE PROPERTIES OF A SINGLE CRYSTAL OF MAGNETITE ORIENTED ALONG PRINCIPAL MAGNETIC AXES (1999)We have measured saturation induced and remanent magnetizations and induced magnetization as a function of field at low temperatures, between 300 K and 10 K, on an oriented 1.5-mm single crystal of magnetite. The induced ...
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(2002)Two-dimensional modulation in synthetic akermanite (Ca2MgSi2O7) and hardystonite (Ca2ZnSi2O7) has been studied by the single-crystal X-ray diffraction methods in the temperature range between 18 and 297 K. It is found that ...
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(2003)As is usual for peculiar chemical compositions, melilite-type compounds exhibit a two-dimensional incommensurately modulated structure which can be described with two wave vectors: q1=α(a* + b*) and q2=α(-a* + b*), where ...
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(1999)Measurement of susceptibility (χ) and hysteresis loops below room temperature for large multidomain hydrothermal magnetite and an acicular single domain magnetite are reported. Hydrothermal samples all display frequency ...
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(1999)A comprehensive low-temperature thermodynamic model for the geochemically important Na2CO3-MgCO3-CaCO3-H2O system is presented. The model is based on calorimetrically determined ΔfH°298 values, S°298 values and C°p(T) ...
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(2002)The heat capacity of paranatrolite and tetranatrolite with a disordered distribution of Al and Si atoms has been measured in the temperature range of 6–309 K using the adiabatic calorimetry technique. The composition of ...
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(1996)We studied Lower Jurassic (Pliensbachian-Toarcian) basalts and tuffs and Middle Jurassic (Bajocian) limestones and marls from 9 sites in the southern part of the Lesser Caucasus (ca. 39.3°N, 45.4°E). A component showing ...
Now showing items 8365-8384 of 39195