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  • Springer  (31)
  • Cambridge University Press  (3)
  • Society of Exploration Geophysicists  (2)
  • 1970-1974  (21)
  • 1965-1969  (8)
  • 1960-1964  (6)
  • 1955-1959  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Ferrous complexes in the catalase reaction (1963)
    Springer
    Cellular and molecular life sciences 19 (1963), S. 80-82 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'auteur critique l'idée que la polarographie démontra l'existence de complexes d'hématine ferreuse avec le peroxide, actifs dans la catalyse. D'autres expériences montrent que les dérivés de l'hématine et du peroxyde sont instables et provoquent la dégradation de la porphyrine. Les complexes de la catalase et du peroxyde ne sont pas actifs polarographiquement et contiennent probablement le fer à l'état ferrique. La théorie deWestheimer sur l'action de la catalase ne s'accorde pas avec les faits démontrant que les dérivés ferreux n'apparaîssent pas dans la réaction et que les complexes avec le peroxyde, autre que le premier composé, sont inactifs. On ne peut pas établir d'analogie bien fondée entre la catalase proprement dite et l'hématine libre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02148029
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  • 2
    Electronic Resource
    Electronic Resource
    Peralkaline acid liquids: A petrological study (1969)
    Springer
    Contributions to mineralogy and petrology 20 (1969), S. 268-294 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Electron-microprobe analyses of the feldspars and associated ferromagnesian minerals in the peralkaline volcanics, comendites and pantellerites, are presented together with new data on the major and trace-elements of the rocks and residual glasses. The feldspar phenocrysts in the pantellerites span a narrower range (Or33–Or39) than those of the comendites (Or30–Or46); both sets show only limited increase in Or outwards, and the zoning is greatest in quartz-bearing assemblages. The feldspar microlites in the residual glasses are invariably more potassic (2–4% Or) than their associated phenocrysts. In pantellerites the feldspars become more potassic as the residual liquids become more sodic; thus the most potassic feldspar is found in the most sodic (and peralkaline) pantellerite. Of the ferromagnesian phenocrysts, aenigmatite is the most ubiquitous and is commonly associated with hedenbergite±fayalite, or ferrorichterite; in the later stages of crystallization (groundmass), it is associated with acmite, arfvedsonite and tuhualite. Aside from slight variation in Ti/Fe+Ti ratio, aenigmatite is virtually constant in composition. The pyroxenes from the different assemblages have zones which together almost span the range acmitehedenbergite. Both ferrorichterite and arfvedsonite incorporate F but not Cl, and are slightly potassic. Tuhualite exists as two varieties; one blue and potassic, the other violet and sodic; both varieties reject halogens. Using (estimated) free-energy data, a field in fo2, T space is postulated in which Fe-Ti oxides are absent; their place is taken by pyroxene and aenigmatite. The no-oxide field will be intercepted by a cooling liquid in which peralkalinity is increasing and in which fo2 is near but above the FMQ buffer. The characteristic pattern of trace-elements in peralkaline volcanics (e.g., high Nb, Ta, Zr, Mo, Zn, Cd, R.E, etc; low Sr, Ba, Mg) are considered to be as much evidence for the peralkaline (salic) condition as of the genetic process. Several lines of evidence suggest that at liquidus temperatures, peralkaline rhyolites are essentially anhydrous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377480
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  • 3
    Electronic Resource
    Electronic Resource
    Calcareous inclusions in lavas and agglomerates of Santorini volcano (1971)
    Springer
    Contributions to mineralogy and petrology 30 (1971), S. 261-276 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Thermally metamorphosed and metasomatised fragments of basement actinolite-chlorite-calcite-quartz schists and quartz-bearing marbles are found as inclusions in Quaternary agglomerates and historic (197 B. C.—1950) dacitic lavas of Santorini volcano, Greece. Inclusions in agglomerates preserve the structure of parent schists in the alternation of bands rich in diopside or salite with bands rich in plagioclase. By contrast, inclusions in historic dacites are not banded. Most develop a thin zone of hybrid material at the contact with enclosing lava. The assemblage calcic clinopyroxene-wollastonite-plagioclase is commonly developed. The clinopyroxene is a Fe3+-rich salite or ferrosalite. Andradite-rich garnet and sphene are accessory minerals. Most examples carry interstitial siliceous glass of distinctive chemical composition, and several show minor olivine, augite, hypersthene and calcic plagioclase of magmatic origin. Other inclusions exhibit the assemblage anhydrite-calcic clinopyroxene, the latter mineral ranging widely in Al content. A single example has been observed to develop two distinct assemblages, the first coarsely crystalline melilite-wollastonite-magnetite, the second finely intergrown melilite-wollastonite-andraditic garnet (-xonotlite). Stability data for hedenbergite and andradite as constituents of skarn assemblages suggest that the clinopyroxene-rich assemblages of inclusions in historic dacites formed at temperatures near to or above 800° C and oxygen fugacity (fO2) considerably greater than that which could be imposed upon the inclusions by dacite magma (T ∼900° C, fO2∼10−13 atm.). Thermal breakdown of original carbonates of the inclusions probably supplied the necessary oxygen. T-fO2 data for the reaction 4 Magnetite+18 Wollastonite ⇌ 6 Andradite indicate that the assemblage melilite-wollastonite-magnetite of the last inclusion described formed at higher T and/or lower fO2 than the assemblage melilite-wollastonite-garnet. The latter assemblage undoubtedly formed during inclusion of the fragment by dacite magma, while metamorphism by a more basic, high temperature magma may have produced the former. Temperature data for reactions limiting the stability of melilite in the system CaO-Al2O3-SiO2-H2O indicate a minimum temperature of around 800° C for formation of both assemblages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404722
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  • 4
    Electronic Resource
    Electronic Resource
    Silica activity and P total in igneous rocks (1971)
    Springer
    Contributions to mineralogy and petrology 33 (1971), S. 1-20 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The variation of silica activity with temperature and pressure for a variety of silica buffers (mineral pairs) allows P total to be calculated for a wide range of igneous rocks. The method also depends on evaluating (∂ log a SiO 2/∂P)T and (Δ log a SiO 2/Δ T)p; the former is equivalent to the partial molar volume of silica in silicate liquids, while the latter is estimated from published experiments on natural melts. Results for calc-alkaline rhyolites with phenocrysts of quartz, olivine or orthopyroxene, and iron-titanium oxides, range from 3.45 to 9.58 kilobars; a pantellerite is intermediate at 7.53 kilobars. At 1327° C, the silicate inclusions in diamond equilibrated at 63.5 kilobars, and the kimberlite crystallisation path intersected the baddeleyite-zircon reaction at 55.7 kilobars. Two trachybasalts would equilibrate with their lherzolite xenoliths at 17.0 and 21.0 kilobars at surface quenching temperatures. Potassic lavas such as orendites and ugandites at 1300° C would be in equilibrium with mantle olivine-orthropyroxene at 35.1 and 69.0 kilobars respectively. Basalts and basaltic-andesites could equilibrate (at 1100° C) with quartz at between 24.9 and 26.8 kilobars; quartz can therefore be considered a possible high pressure “xenocryst” in lavas with low Sr87/Sr86 ratios. Andesites will equilibrate at 1300° C with the mantle at a depth of 75 kilometres; at greater depths andesite will have a basaltic precursor. In general, lavas with low silica activity will equilibrate at greater depths in the mantle than those with higher silica activities. The Apollo 11 basalts contain minerals which suggest equilibration at 37 kilobars; the calculated quenching temperature is 1009° C, from which logf O 2 can be derived (−15.2) which in turn indicates approximately 0.10% Fe2O3 in these lavas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373791
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  • 5
    Electronic Resource
    Electronic Resource
    Liquids in equilibrium with peridotitic mineral assemblages at high water pressures (1974)
    Springer
    Contributions to mineralogy and petrology 45 (1974), S. 289-316 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Pressure-temperature conditions for which “andesitic” liquids (∼60% SiO2) may coexist with mineral assemblages of the type magnesian olivine + orthopyroxene + clinopyroxene±amphibole±phlogopite have been investigated, both by means of partial melting experiments on the pyrolite model composition, and by experiments involving addition of olivine to andesite or basaltic andesite compositions at or near their liquidus temperatures. In the latter experiments, reaction relationships between quartz-normative liquid and olivine were made to proceed until olivine persisted. The composition of the final liquid in equilibrium with olivine (plus pyroxenes etc.) was then estimated by microprobe analysis of its quench products (glass, quench crystals). The inferred liquid compositions were tested for equilibrium with coexisting crystals using criteria based on mass balance within the total assemblage, equilibrium element partition relationships, and the requirement that the liquidus temperatures and near-liquidus crystalline phases of these compositions should closely match the temperature of the original olivine-addition experiment and the crystalline phases developed during it. At 1000° C–1050° C, liquids which satisfy these criteria for equilibrium with assemblages which include olivine are “andesitic” (58–60% SiO2, 5–12% normative Qz) only at water pressures ≤ 10kb. At 15 kb, liquids in equilibrium with olivine at 1000° C and 980° C have ∼56% SiO2, high alkali contents, and 5–10% normative olivine. Similar compositions are in equilibrium with orthopyroxene and garnet alone at 20 kb. These results show that andesitic magmas are unlikely to be produced by melting of a peridotitic mantle at pressures 〉10 kb (depths〉35 km). If hydrous, but otherwise geochemically primitive peridotitic compositions are partially melted at pressures〈10 kb, then “andesitic” products will be much more magnesian and poorer in alkalies than typical natural andesites. These conclusions raise serious difficulties for models of andesite genesis by the melting of hydrous peridotitic mantle immediately overlying Benioff zones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371749
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  • 6
    Electronic Resource
    Electronic Resource
    A note on the significance of the assemblage calcite-quartz-plagioclase-paragonite-graphite (1970)
    Springer
    Contributions to mineralogy and petrology 28 (1970), S. 112-116 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The biotite zone assemblage: calcite-quartz-plagioclase (An25)-phengite-paragonite-chlorite-graphite, is developed at the contact between a carbonate and a pelite from British Columbia. Thermochemical data for the equilibrium paragonite+calcite+2 quartz=albite+ anorthite+CO2+H2O yields: $$\log f{\text{H}}_{\text{2}} {\text{O}} + \log f{\text{CO}}_{\text{2}} = 5.76 + 0.117 \times 10^{ - 3} (P - 1)$$ for a temperature of 700°K and a plagioclase composition of An25. By combining this equation with equations describing equilibria between graphite and gas species in the system C-H-O, the following partial pressures: $$P{\text{H}}_2 {\text{O}} = 2572{\text{b, }}P{\text{CO}}_2 = 3162{\text{b, }}P{\text{H}}_2 = 2.5{\text{b, }}P{\text{CH}}_4 = 52.5{\text{b, }}P{\text{CO}} = 11.0{\text{b}}$$ are obtained for $$f{\text{O}}_2 = 10^{ - 26}$$ . If total pressure equals fluid pressure, then the total pressure during metamorphism was approximately 6 kb. The total fluid pressure calculated is extremely sensitive to the value of $$f{\text{O}}_2$$ chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00404993
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  • 7
    Electronic Resource
    Electronic Resource
    Origin and crystallization history of Permian tholeiites from the Saar-Nahe trough, SW Germany (1973)
    Springer
    Contributions to mineralogy and petrology 40 (1973), S. 327-344 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Hirschberg and Rödern diatremes, within the Permian Saar-Nahe trough, SW Germany, are composed chiefly of basaltic tuffs, with associated small intrusions of K-rich tholeiites. Several tholeiite bodies carry 2–20 mm crystals of magnesian clinopyroxene and orthopyroxene, the latter containing up to 5.5% Al2O3 and often extensively resorbed and rimmed by fine-grained olivine and clinopyroxene. Experimental duplication of these pyroxenes has been achieved under conditions of Pload=6–10 kb, T=1280–1080° C and 2–4 wt.-% H2O, confirming that they represent a rare occurence of high pressure phenocrysts in tholeiitic basalts. These conditions of pyroxene crystallization also place constraints on processes of magma generation, indicating that the tholeiites originated by partial melting of unusually hydrous peridotite mantle (0.4–0.8% H2O) beneath a relatively thin continental crust (maximum thickness approximately 30 km). Water present in the mantle at the site of magma generation may have been derived from the dehydration of oceanic lithosphere prior to the formation of the Saar-Nahe trough. This lithosphere probably underwent subduction at the margin of the Palaeozoic European continent during the Hercynian cycle of sedimentation, andesitic volcanism and folding. The termination of this cycle was followed by a period of basin-range type tensional faulting, leading to the formation of the Permian basins of present-day Central Europe, and widespread bimodal basalt/rhyolite volcanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371023
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  • 8
    Electronic Resource
    Electronic Resource
    The isolation of indole-3-acetyl-2-O-myo-inositol from Zea mays (1966)
    Springer
    Planta 72 (1966), S. 258-264 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The isolation and crystallization of an ester of myo-inositol and indole-3-acetic acid is described. The ester was extracted from mature corn (maize) kernels. On the basis of data for solubility in acetone, acetone-water mixtures and water, chromatographic data, and data on acyl migration the ester, as isolated, is tentatively identified as indole-3-acetyl-2-O-myo-inositol. The compound promoted growth in a flax callus culture and in the standard Avena coleoptile straight-growth test, the biological activity in the former tissue being relatively greater than in the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386752
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  • 9
    Electronic Resource
    Electronic Resource
    The photoperiodic control of reproduction inCoturnix quail. The temporal pattern of LH Secretion (1974)
    Springer
    Journal of comparative physiology 93 (1974), S. 301-313 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Secretion of LH in quail is a photoperiodically-controlled response. The temporal pattern of secretion was determined in an attempt to gain information on the possible rhythmic nature of secretion of this hormone. Sexually mature birds undergoing gonadal regression in response to short photoperiods (8L∶16D) had low plasma levels of LH but showed markedly increased titres after restimulation with a single long photoperiod (20L∶4D). Secretion of the gonadotrophin occurred late in the photoperiod some 18–19 hr from “dawn” and persisted at a high level during the period of darkness; during a second long photoperiod plasma levels decreased in the first few hours but then the pattern of secretion recurred at a similar time to that in day 1 (Figs. 2, 4). When regressing birds were restimulated with daylengths of 14L∶10D, LH secretion was still delayed until some 18 hr from dawn, occurring under these conditions during the dark period (Fig. 3). If LH secretion results from processes initiated during coincidence of light with a “sensitive” phase of a rhythm of photoinducibility, it would appear that there is a delay of several hours between such coincidence and pituitary response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00606799
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  • 10
    Electronic Resource
    Electronic Resource
    An interpretive view of refiner pulping (1970)
    Springer
    Wood science and technology 4 (1970), S. 292-300 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Recent developments in refiner pulping are interpretively reviewed in terms of various aspects. These are the mode of chip breakdown, thermoplasticity, the influence of temperature on fiber breaks, torsion effects, physical state as a factor in the breakdown to coarse fiber bundles as well as fiber fraction characteristics, within fiber changes, observations on a hardwood, the introduction of chemicals, and future developments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386405
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