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  • LUNAR AND PLANETARY EXPLORATION  (9)
  • SPACE SCIENCES  (3)
  • Geomagnetics  (2)
  • Rodinia  (2)
  • 31.30.Gs  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Litholog and structure of the Grenville-aged (≈1.1 Ga) basement of heimefrontfjella (East Antarctica) (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 800-821 
    Details
    ISSN: 1437-3262
    Keywords: East Antarctica ; Greenville ; Pan-African ; Rodinia ; Heimefrontfjella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Heimefrontfjella mountains, Western Dronning Maud Land (East Antarctica), are dominantly composed of Grenville-aged (≈ 1.1 Ga) rocks, which were reworked during the Pan -African orogeny at ≈500 Ma. Three discontinuity-bounded Grenville-aged terranes have been recognized namely (from north to south) the Kottas, Sivorg and Vardeklettane terranes. The terranes contain their own characteristic lithological assemblages, although each is made up of an early supracrustal sequence of metavolcanic and/or metasedimentary gneisses, intruded by various (predominantly granitoid) suites. No older basement upon which the protoliths of these older gneisses were deposited has been recognized. In each terrane the older layered gneisses were intruded by various plutonic suites ranging in age from ≈ 1150 to ≈1000 Ma. The Vardeklettane terrane is characterized by abundant charnockites and two-pyroxene granulite facies parageneses in metabasites, whereas the Sivorg and Kottas terranes were metamorphosed to amphibolite facies grade. P-T estimates show that peak metamorphic conditions changed from ≈600°C at 8 kbar in the south, to ≈700 °C at 4 kbar in the northern Sivorg terrane. Regional greenschist retrogression of high-grade assemblages may be of Pan-African age. The Heimefrontfjella terranes were juxtaposed and pervasively deformed during a complex and protracted period of E-W collision orogenesis in a transpressive regime at ≈ 1.1 Ga. This is manifest as early, gently dipping thrust-related shear fabrics (D1), succeeded by the initiation of an important (D2) steep dextral shear zone (Heimefront shear zone, HSZ), during which the early fabrics and structures were steepened and rotated in an anticlockwise sense. The HSZ is a curvilinear structure which changes from a dextral oblique strike-slip lateral ramp in the north to a steep dip-slip frontal ramp in the south, where it forms the boundary between the Sivorg and Vardeklettane terranes. The Pan-African event is manifested as discrete, low- to medium-temperature ductile to brittle shears (D3) and numerous K/Ar cooling ages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440112
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Lithology and structure of the Grenville-aged (∼1.1 Ga) basement of Heimefrontfjella (East Antarctica) (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 800-821 
    Details
    ISSN: 0016-7835
    Keywords: Key words East Antarctica ; Greenville ; Pan-African ; Rodinia ; Heimefrontfjella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The Heimefrontfjella mountains, Western Dronning Maud Land (East Antarctica), are dominantly composed of Grenville-aged (∼1.1 Ga) rocks, which were reworked during the Pan -African orogeny at ∼500 Ma. Three discontinuity-bounded Grenville-aged terranes have been recognized namely (from north to south) the Kottas, Sivorg and Vardeklettane terranes. The terranes contain their own characteristic lithological assemblages, although each is made up of an early supracrustal sequence of metavolcanic and/or metasedimentary gneisses, intruded by various (predominantly granitoid) suites. No older basement upon which the protoliths of these older gneisses were deposited has been recognized. In each terrane the older layered gneisses were intruded by various plutonic suites ranging in age from ∼1150 to ∼1000 Ma. The Vardeklettane terrane is characterized by abundant charnockites and two-pyroxene granulite facies parageneses in metabasites, whereas the Sivorg and Kottas terranes were metamorphosed to amphibolite facies grade. P–T estimates show that peak metamorphic conditions changed from ∼600  °C at 8 kbar in the south, to ∼700  °C at 4 kbar in the northern Sivorg terrane. Regional greenschist retrogression of high-grade assemblages may be of Pan-African age. The Heimefrontfjella terranes were juxtaposed and pervasively deformed during a complex and protracted period of E–W collision orogenesis in a transpressive regime at ∼1.1 Ga. This is manifest as early, gently dipping thrust-related shear fabrics (D1), succeeded by the initiation of an important (D2) steep dextral shear zone (Heimefront shear zone, HSZ), during which the early fabrics and structures were steepened and rotated in an anticlockwise sense. The HSZ is a curvilinear structure which changes from a dextral oblique strike-slip lateral ramp in the north to a steep dip-slip frontal ramp in the south, where it forms the boundary between the Sivorg and Vardeklettane terranes. The Pan-African event is manifested as discrete, low- to medium-temperature ductile to brittle shears (D3) and numerous K/Ar cooling ages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050113
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Test of advanced hyperfine structure theory by precision radio-frequency and laser spectroscopy in molybdenum (1988)
    Springer
    The European physical journal 10 (1988), S. 59-70 
    Details
    ISSN: 1434-6079
    Keywords: 35.10.Fk ; 32.10.Hq ; 32.10.Tb ; 31.30.Gs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure splittings of 32 even parity states and of 26 odd partity states of molybdenum have been measured by atomic beam magnetic resonance and by laser induced fluorescence. The analysis of the hyperfine structure data of the even parity configurations (4d+5s)6 yields experimental evidence for second order hyperfine interactions. In addition, theg J factors of 19 fine structure levels have been determined in order to test the quality of intermediate coupling wave functions for the (4d+5s)6 configurations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425581
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  • 4
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    Geomagnetism (1987)
    Academic Press
    In:  London, Academic Press, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Details
    Publication Date: 1987
    Keywords: Textbook of geophysics ; Geomagnetics ; Applied geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Geomagnetism, Vol. 4 (1991)
    Academic
    In:  San Diego, Calif., Academic, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Details
    Publication Date: 1991
    Keywords: Geomagnetics ; Textbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Major and trace element chemistry of Boulder 1 at Station 2, Apollo 17 (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Twenty-seven samples from Boulder 1 at Station 2 are analyzed for major and trace elements by atomic absorption spectrophotometry and neutron activation analysis. Two types of matrix and several types of clast materials are characterized on the basis of their chemistry. It is shown that one matrix type is a common material at the Apollo 17 site, while the other is probably exotic to that site. The most unusual clast materials found are coarse norite (an old rock no longer found in millimeter fragments at the site) and pigeonite basalt (possibly a highland volcanic rock). It is concluded that the boulder-forming process combined materials from at least two different localities or vertical strata.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: The Moon; 14; Nov
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Major and trace element concentrations in samples from 72275 and 72255 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Analytical data have been obtained for Co, Sc, Hf, Zn, Cr, Ga, Rb, Cs, Ni, major elements, and rare earth elements in eight samples from boulder 1. The data for trace elements were obtained by radiochemical neutron activation analysis. Major elements, except Na and Mn, were obtained by atomic absorption spectral photometry. Values for Na and Mn were obtained by neutron activation analysis of the same powder that was later dissolved to provide the atomic absorption analyses.
    Keywords: SPACE SCIENCES
    Type: Smithsonian Astrophys. Obs. Interdisciplinary Studies of Samples from Boulder 1, Sta. 2, Apollo 17, Vol. 1; p 121-129
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    NASA TECHNICAL REPORTS
  • 8
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    Rare earths, other trace elements and iron in Luna 20 samples. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The results of the analysis by neutron activation of six samples from the Luna 20 mission and one sample of less than 1 mm fines from Apollo 16 are reported. The concentrations of the rare-earth elements (REE) in the samples of fines from Luna 20 and Apollo 16 are less than those found for corresponding materials from the mare areas but a negative Eu anomaly is still present. The concentrations of the REE in fines from Luna 20 are only about two-thirds as great as in the sample of Apollo 16 fines, but the concentration of Co, Sc and Cr are greater by factors ranging from 1.5 to 2.3.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 9
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    A geochemical and petrographic study of 1-2-mm fines from Apollo 17 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Samples of fines less than 1-mm and 155 1-2 mm particles from several Apollo 17 sites were analyzed for Na, Sc, Cr, Mn, Fe, Co, Ni, Hf, Ta, Th, and REE. Products of comminution and construction are present in the 1-2 mm particles, and the compositions of the rock fragments clearly indicate the general chemical characteristics of their parent rock types. The likely sources of materials for the glassy particles are considered. Glasses are enriched over their parent soils in Fe, Sc, Mn, and Cr, and are relatively enriched in light REE, so that some chemical fractionation accompanies glass-forming processes. Elements were determined by instrumental neutron activation analysis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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    NASA TECHNICAL REPORTS
  • 10
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    Major and trace element compositions of matrix and aphanitic clasts from consortium breccia 73215 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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