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  • 1
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    Continental crustal composition and lower crustal models (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The composition of the upper crust is well established as being close to that of granodiorite. The upper crustal composition is reflected in the uniform REE abundances in shales which represent an homogenization of the various REE patterns. This composition can only persist to depths of 10-15 km, for heat flow and geochemical balance reasons. The composition of the total crust is model dependent. One constraint is that it should be capable of generating the upper granodioritic (S.L.) crust by partial melting within the crust. This composition is based on the andesite model, which assumes that the total crust has grown by accretion of island arc material. A representation of the growth rate of the continental crust is shown. The composition of the lower crust, which comprises 60-80% of the continental crust, remains a major unknown factor for models of terrestrial crustal evolution. Two approaches are used to model the lower crust.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust; p 87-91
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Composition of meteorite impact glass across the Henbury strewnfield. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Chemical analysis of meteorite impact glass from separated areas across Henbury strewnfield
    Keywords: GEOPHYSICS
    Type: GEOCHIMICA ET COSMOCHIMICA ACTA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Excess europium content in Precambrian sedimentary rocks and continental evolution (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is proposed that the europium excess in Precambrian sedimentary rocks, relative to those of younger age, is derived from volcanic rocks of ancient island arcs, which were the source materials for the sediments. Precambrian sedimentary rocks and present-day volcanic rocks of island arcs have similar REE patterns, total REE abundances, and excess Eu, relative to the North American shale composite. The present upper crustal REE pattern, as exemplified by that of sediments, is depleted in Eu, relative to chondrites. This depletion is considered to be a consequence of development of a granodioritic upper crust by partial melting in the lower crust, which selectively retains europium.
    Keywords: GEOPHYSICS
    Type: Geochimica et Cosmochimica Acta; 38; May 1974
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Geochemistry of andesites. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Trace element geochemistry of calc-alkaline andesites, discussing crustal composition models and trace elements distribution
    Keywords: GEOPHYSICS
    Type: ORIGIN AND DISTRIBUTION OF THE ELEMENTS; May 08, 1967 - May 11, 1967; PARIS; FRANCE
    Format: text
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    NASA TECHNICAL REPORTS
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