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  • 1
    Online Resource
    Online Resource
    Chemical Petrology : With Applications to the Terrestrial Planets and Meteorites. (1977)
    New York, NY :Springer,
    Details
    Keywords: Metamorphic rocks. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (407 pages)
    Edition: 1st ed.
    ISBN: 9781461298892
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6864229
    Language: English
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  • 2
    Online Resource
    Online Resource
    Thermodynamics of Rock-Forming Crystalline Solutions. (1973)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Thermodynamics. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (202 pages)
    Edition: 1st ed.
    ISBN: 9783642655586
    Series Statement: Minerals, Rocks and Mountains Series ; v.8
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6563200
    Language: English
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  • 3
    Online Resource
    Online Resource
    Energetics of Geological Processes : Hans Ramberg on His 60th Birthday. (1977)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Geodynamics. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (487 pages)
    Edition: 1st ed.
    ISBN: 9783642865749
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6700735
    DDC: 551.1
    Language: English
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  • 4
    Electronic Resource
    Electronic Resource
    High-pressure Raman study on nanocrystalline CeO2 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2968-2971 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To evaluate the reported change in the physical and electronic properties of nanomaterials as compared to bulk material, we performed high-pressure Raman spectroscopy on nanocrystalline CeO2 at room temperature up to a pressure of 36 gigapascals (GPa) with and without pressure medium. We observed a linear dependence of the first order Raman signal on pressure. The compression and decompression follow the same path under hydrostatic conditions but show hysteresis (∼20 R cm−1) under nonhydrostatic compression and decompression. We found that fluorite type CeO2 undergoes a phase transition to an orthorhombic PbCl2 type structure at a pressure around 26.5 GPa, which is less than that reported for bulk CeO2 (32 GPa). On decompression, we found that the high-pressure phase can exist down to a pressure of 1.8 GPa. The results obtained on compression of sample with CsCl as the pressure medium were compared to that compressed without any medium. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1333720
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    EVOLUTION OF ZIRCONS IN SEDIMENTARY AND METAMORPHIC ROCKS (1966)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 6 (1966), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Zircons have been studied in the sedimentary rocks of the Sparagmite Group (Eocambrian) and their metamorphic associates from the Trondheim area and the adjacent regions in Norway and Sweden. The majority of zircon population (type B) has been formed in the sediments by authigenesis. Another authigenic associate is rutile. The authigenic zircons have irregular, round and ellipsoidal habits. In metamorphic rocks the same grains show a greater tendency of euhedrism, forming drum-like crystals with acute (331) pyramids and short prisms. Authigenic zircons are usually clear and transparent but some grains may show cloudy appearance. A few other grains (type A) with different habit and many inclusions appear to be of detritai nature.Dissolution of a metamictized zircon population in the source rock is possible in many ways. An important possibility is the dissolution of zircons in alkaline solution. Carbonated lime-rich waters or other acidic solutions could be equally effective. Zirconates, so formed, are transported to the basin of deposition as colloidal particles or as ionic complexes. The authigenic process is visualized as a deposition of the zirconates by adsorption or by precipitation as zirconium hydroxide, possibly due to change in the Eh and pH in the environment. The hydrated oxide subsequently reacts with silica to form metastable hydrozircon. In course of time hydrozircon dehydrates and becomes a normal zircon.Numerous growths have been noted and are classified genetically into (l) late authigenic growths, and (2) growths syngenetic with metamorphism. The shape of the host grain usually controls the final shape of the overgrown grain.There is some effect of metamorphism on the morphology of the authigenic zircons. In view of the characters of the newly generated zircons, the use of shape, size, zoning and such other parameters of zircons in petrogenetic problems, has to be retested to ensure its reliability.Rather than being a mineral of igneous derivation only, zircon is from three parentages: igneous, authigenic and metamorphic. It is argued that the persistence of the authigenic zircons should be greatest because of very low concentration of radioactive elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1966.tb01568.x
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  • 6
    Electronic Resource
    Electronic Resource
    EVOLUTION OF ZIRCONS IN SEDIMENTARY AND METAMORPHIC ROCKS: A REPLY (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 10 (1968), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In a discussion Kalsbeek (1967) suggests that my idea of an authigenic origin of zircons seems to be the result of mis-identification of authigenic titaniferous minerals as zircon. Kalsbeek appears to have formed this opinion firstly because he sees all the crystals (Saxena, 1966a, plate IV) as zircons. I never mentioned this. Since 70% of the matrix in the sandstones consists of such aggregate, the very idea of having so much zircon in the rock would be fantastic and absurd.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1968.tb01106.x
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental and theoretical identification of a new high-pressure phase of silica (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 362-365 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Following the discovery of stishovite (the highest-pressure polymorph of silica known from natural samples), many attempts have been made to investigate the possible existence of denser phases of silica at higher pressures. Based on the crystal structures observed in chemical analogues of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388362a0
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the fixed charge density and permselectivity of parchment supported manganese ferrocyanide membrane (1971)
    Springer
    Colloid & polymer science 243 (1971), S. 67-70 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Es wurden Membranpotentiale von Manganferrocyanid-Membranen auf Pergamentträgern in Lösungen verschiedener Elektrolyte über weite Konzentrationsbereiche untersucht. Das Membranpotential nahm mit der zunehmenden Verdünnung zu. Die fixierte Ladungsdichte wurde nachAltug undHair ermittelt und betrug −0.06 N. Die Änderung der Überführungszahl der Gegenionen in die Membranphase und die Permselektivität der Membran wurden ebenfalls bestimmt.
    Notes: Summary Membrane potentials across parchment supported manganese ferrocyanide membrane for various electrolytes over a wide concentration range have been studied. It was found that the membrane potential increases with dilution of the external electrolyte solutions. The fixed charge density of the membrane has been evaluated byAltug andHair's method and comes out to be −0.06 N. The variation of the transport number of the counterions in the membrane phase and perm-selectivity of the membrane with dilution have also been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500617
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  • 9
    Electronic Resource
    Electronic Resource
    Fluids at crustal pressures and temperatures (1987)
    Springer
    Contributions to mineralogy and petrology 95 (1987), S. 370-375 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The pressure-volume-temperature data of several gases (H2, O2, CO, CH4, N2 and CO2) have been used to obtain the following corresponding states equation (P〉1 kbar; T〉400 K): Z(±0.0878)=A+BP r +CP r /2 (21) where Z is the compressibility factor, P r reduced pressure (P/critical P), T r reduced temperature (T/critical T) and the coefficients are given by: A=1−0.5917 T r /−2 B=0.09122 T r /−1 C=1.4164×10−4 T r /−2 −2.8349×10−6 ln T r (P〉1 kbar; T〉400 K). At pressures below 1 kbar, Z is given by: Z(±0.0761)=1+BP r +CP r /2 (23) where B=0.09827 T r /−1 −0.2709 T r /−3 C=0.01472 T r /−4 −0.00103 T r /−1.5 . For water (P〉1 kbar; T〉400 K): Z(±0.0209)=A+BP+CP 2 (22) where A=−0.7025+1.16×10−3 T+99.6799 T −1 B=0.2143 T −1−3.1423×10−14 T 3 C=−2.249×10−6 T −1−0.1459 T −3+2.1690×10−15 T 2. At pressure below 1 kbar, the equation is (P〉100 bar; T 〉673 K): Z(±0.0601)=1+B′/V+C′/V 2 (24) where B′=−2.20960 T0.5+3.35460×10−8 T3 C′=3.4569×10−5T2.5+64.9764 ln T Fugacities of the gases may be obtained by integrating the Z equations separately and combining the results as follows: (26) $$\int\limits_1^P {VdP = RT} {\text{ }}\left( {\int\limits_1^{1000} {Z_{23} /PdP + } \int\limits_{1000}^1 {Z_{21} /PdP} } \right)$$ The subscript in Z denotes the equation which is to be used for calculating Z.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371850
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of carbon sources on germination of chlamydospores of Ustilago scitaminea Syd (1971)
    Springer
    Mycopathologia 43 (1971), S. 317-322 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02051751
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