USRA Houston Repository

Browsing LPI Contributions by Author "Donaldson, Colin H."

Browsing LPI Contributions by Author "Donaldson, Colin H."

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  • Experimental modeling of the cooling history of Apollo 12 olivine basalts 
    Donaldson, Colin H.; Usselman, Thomas M.; Williams, Richard J.; Lofgren, Gary E. (Pergamon Press, 1975)
    An analog of the Apollo 12 olivine vitrophyres has been crystallized in a 1-atm gas-mixing furnace at cooling rates ranging between 1250 and 0.7°/hr and isothermally at degrees of supercooling ranging from 10°C to 325°C. ...
  • Experimentally reproduced textures and mineral chemistries of high-titanium mare basalts 
    Usselman, Thomas M.; Lofgren, Gary E.; Donaldson, Colin H.; Williams, Richard J. (Pergamon Press, 1975)
    The purpose of this study was twofold: (1) to investigate the low-pressure equilibrium phase relations of a synthetic HT basalt composition as a function of oxygen fugacity (f 0 2), and (2) to develop petrographic criteria ...
  • Experimentally reproduced textures and mineral chemistry of Apollo 15 quartz normative basalts 
    Lofgren, Gary E.; Donaldson, Colin H.; Williams, Richard J.; Mullins, Jr., Oscar; Usselman, Thomas M. (Pergamon Press, 1974)
    An analog of the Apollo 15 quartz-normative basalts (also called pyroxene-phyric basalts) has been experimentally crystallized at a variety of linear cooling rates between 1250 and 1°C/hr at one atmosphere total pressure ...
  • Geology, petrology, and crystallization of Apollo 15 quartz-normative basalts 
    Lofgren, Gary E.; Donaldson, Colin H.; Usselman, Thomas M. (Pergamon Press, 1975)
    The quartz-normative (QN) basalts collected at the Apollo 15 site have a unique and consistent bulk chemistry, but display a systematic variation in phenocryst morphology and matrix texture. Experimental crystallization ...
  • Glass compositions in Apollo 16 soils 60501 and 61221 
    Ridley, W. I.; Reid, Arch M.; Warner, Jeffrey L.; Brown, Roy W.; Gooley, R.; Donaldson, Colin H. (Pergamon Press, 1973)
    Major element analyses have been made of 309 glasses in two Apollo 16 soils, 60501 and 61221. Averages of preferred glass compositions are used as a guide to the nature of the major rock types contributing to these soils.

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