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Browsing ELibrary by Title
Now showing items 8550-8569 of 21936
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(2004)The average crystal structures of two natural porous titanosilicates of the labuntsovite group, lemmleinite-Ba and lemmleinite-K, ideally Na4K4Ba2Ti8(Si4O 12)4O4(OH)4·8H 2O and Na4K4K2Ti 8(Si4 O12)4O 2(0H)6·8H2O, respectively, ...
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(2005)Lherzolite–wehrlite (LW) series xenoliths from the quaternary Tok volcanic field in the southeastern Siberian craton are distinguished from the more common lherzolite–harzburgite (LH) series by (a) low Mg numbers (0.84–0.89) ...
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(1989)Garnet is rather common in intermediate and silicic plutonic igneous rocks but rare in volcanic rocks, particularly those of mafic composition. Finds of garnet of igneous origin are of great interest because they are a ...
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(1999)In the Bashkir mega-anticline (western Urals) stratabound magnesite, siderite, fluorite and base-metal deposits are hosted by a sequence of Riphean sediments with a thickness of more than 12 km. The giant deposits of ...
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(2004)The occurrence of graphite-coated microdiamonds is a characteristic feature of ultrahigh-pressure metamorphic rocks. Nonetheless, their tiny dimension was an insurmountable obstacle for the study of these aggregates for a ...
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(1995)The composition and amounts of fluids strongly affect phase relations near the liquidus of Group 1A kimberlites. Under CO2-saturated conditions olivine disappears from the liquidus at 45 kbar and orthopyroxene, garnet and ...
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(1989)The authors describe silicate inclusions in chromian spinels and syngenetic platinum minerals from the alpinotype ultramafic rocks of the Koryak Highlands and the alkalic-ultramafic plutons of the Aldan Shield. Both of ...
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(2004)Most hypotheses about the origin of kimberlites explain the specific composition of the rocks (high content of incompatible elements, mainly, LREE) by the low degree of partial melting of the lithospheric mantle during ...
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(1993)A coal-bed wax was fractionated and analyzed using capillary column GC and combined GC/MS. It was found that the major components in the wax were n-alkanes (55.6%), cyclic/branched alkanes (26.0%), and several homologous ...
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ORIGIN OF LOW-CA PYROXENE IN AMOEBOID OLIVINE AGGREGATES: EVIDENCE FROM OXYGEN ISOTOPIC COMPOSITIONS (2005)Amoeboid olivine aggregates (AOAs) in primitive carbonaceous chondrites consist of forsterite (Fa<2), Fe,Ni-metal, spinel, Al-diopside, anorthite, and rare gehlenitic melilite (Åk<15). ~10% of AOAs contain low-Ca pyroxene ...
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(2002)Edingtonite and yugawaralite showing sectoral textures were studied by polarized optical microscopy and X-ray analysis. In edingtonite, the m{110} sector (2Vα = 22°) is optically triclinic and the c{001} sector (2Vα = 52°) ...
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(2000)Phase equilibria experiments on an Apollo 14B green glass composition are used to develop a petrogenetic model for the Apollo 14B green glasses. New compositional data for the Apollo 14B green glasses are presented, which ...
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(1997)Magnetite in the oxidized CV chondrite Allende mainly occurs as spherical nodules in porphyritic-olivine (PO) chondrules, where it is associated with Ni-rich metal and/or sulfides. To help constrain the origin of the ...
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(1988)The depleted chemical signature of MORB has been commonly thought to be a consequence of the progressive extraction of continental crust from the upper mantle, although few attempts have been made to evaluate the exact ...
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(2002)Identifying the mechanisms that drove the evolution of planetary volatiles from primordial to present-day compositions is one of the classic challenges in the planetary sciences. The field bristles with models of one type ...
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(1996)Describes the factors that control the amplitude and frequency of sea-floor seismic noise in the frequency band f=3...20 Hz and discusses some sources of the most significant disturbances. The low frequency disturbances ...
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(1998)I have oversaturated the immiscible system SiO2Al2O3FeOK2O with FeCr2O4 to study the fractionation of chromite between conjugate siliceous and fayalitic melts. Although both melts are oversaturated with chromite, chromite ...
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(2001)The principal isoprenoid hydrocarbons in flash pyrolysates from immature kerogens are prist-1-ene and, to a lesser extent, prist-2-ene. The precise origin of these compounds is still a matter of debate. Chemical degradation ...
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(2006)Silica-rich objects are common minor components in ordinary chondrites (OC), occurring as fragments and as chondrules. Their typical paragenesis is orthopyroxene + SiO2 (with bulk SiO2 >65 wt%) and occasionally with ...
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(1989)The foci of strong tremors are generally confined to long-lived active faults. However, some earthquakes occur at great distances from the boundaries of lithospheric plates, and the seismic events which occur in the stable ...
Now showing items 8550-8569 of 21936