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Browsing ELibrary by Title
Now showing items 4440-4459 of 21934
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(1999)Transmission electron microscopy (TEM) observation shows narrow regions in a Ti-containing Mg-rich annite of composition (K (sub 0.90) Na (sub 0.02) ) (Mg (sub 0.72) Fe (super 2+) (sub 1.78) Mn (sub 0.03) Ti (sub 0.27) Al ...
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(1999)The equation of state and high pressure (>200 GPa) behavior of magnesite were investigated using first principles pseudopotential calculations based upon density functional theory within the generalized gradient approximation. ...
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(2003)Ab initio calculations of the surface structure and properties of the (001) surface of galena (PbS) have been performed using two complementary approaches. Both Gaussian and numerical basis functions have been utilized, ...
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(2001)The Earth’s interior is an extreme environment where the pressure and temperature (up to 3.6 Mbar or 360 GPa, and approximately 6000 K, respectively at Earth’s center) are sufficiently high to affect the structure, physics, ...
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(2001)Huge amounts of arthropod cuticular fragments were found in the intestinal contents of 21 specimens of Thaumaturus intermedius, a teleostoid fish from the Messel oil shale. The cuticular fragments are identical to those ...
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(1988)Protasite was first found by us in the USSR at the beginning of the 1970's in close association with bauranoite and metacalciouranoite (metacalsuranoite). New protasite specimens from the same ore deposit were studied in ...
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(2003)Ion-microprobe U–Th–Pb analyses of zircon from three high-level syenite–granite stocks in the western part of the Taimyr fold-and-thrust belt have yielded early Triassic ages of 249–241 Ma. Those syenite–granite bodies ...
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(1990)Anorthosite of the independent type is a typical component of Precambrian granulite-gnesis, and the determination of its origin is very intimately related to a fundamental problem of geology, namely ascertaining the mode ...
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(1990)Investigations done in the northern Caspian Sea more than 20 years ago have defined the general structure of the Jurassic-Cretaceous and Cenozoic deposits, but information on older complexes was lacking until recently. In ...
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(1986)The Alpha Ridge is one of three subparallel trending ridges that cut the Arctic Ocean. It is roughly Late Cretaceous to Eocene in age, and seismic refraction records suggest it comprises a thick sequence of oceanic crust. ...
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FIRST SM-ND DATA ON LATE ORDOVICIAN AGE OF GRANITOIDS OF THE VERKHNYAYA MAYA UPLIFT, OKHOTSK MASSIF (2003)The Verkhnyaya Maya Uplift (VMU), which extends from upper reaches of the Maya River along its left bank to the Inikan River in the eastern part of the Yudoma-Maya Highland, is restricted to the complex junction of ...
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(2001)The structure refinement of associated phlogopite-2O and phlogopite-IM from the Khibiny massif (Kola Peninsula, Russia) is reported. Crystal data are: a = 5.2781(5), b = 9.141(1), c = 20.124(4) Angstrom, Ccmm (2O); a = ...
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(1989)Studying the alkalic igneous activity of ocean islands is a problem that should be solved in the context of reconstructing the geodynamic regime of the oceanic lithosphere, as well as the geochemical evolution and heterogeneity ...
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(2001)A first-order perturbation theory for seismic isochrons is presented in a model independent form. Two ray concepts are fundamental in this theory, the isochron ray and the velocity ray, for which I obtain first-order ...
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FIRST-ORDER REVERSAL CURVE (FORC) DIAGRAMS FOR PSEUDO-SINGLE-DOMAIN MAGNETITES AT HIGH TEMPERATURE (2002)The recently developed first-order reversal curve (FORC) technique for rapidly examining magnetic domain state has great potential for paleomagnetic and environmental magnetic investigations. However, there are still some ...
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(2001)We have recently developed a technique for characterizing the magnetic components within natural particle assemblages. This technique is based on the transformation of magnetization data from first-order reversal curves ...
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(2003)Recently, the Hy-2a hydrous olivine (MgH2 SiO4)·3(Mg2SiO4) occurring as nanometre-sized inclusions in mantle olivines has been found by TEM, and has been suggested to be a new DHMS phase (Khisina et al. 2001). A model of ...
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(2003)Planewave pseudopotential calculations of formation energies for several ordered supercells were used as bases for first principles calculations of the CaCO3}-MgCO{3~ and CdCO3}-MgCO{3~ phase diagrams. Calculated phase ...
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(2002)Several phosphate minerals have been investigated for their usefulness in geochronology and thermochronology by the fission track method. Of these, apatite Ca5(PO4)3(F,Cl,OH)], has proved pre-eminently suitable for this ...
Now showing items 4440-4459 of 21934