Browsing LPI Contributions by Author "Usselman, Thomas M."

Now showing items 1-6 of 6

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 ...
The phase relations, textures, and mineral chemistries of high-titanium mare basalts as a function of oxygen fugacity and cooling rate

Usselman, Thomas M.; Lofgren, Gary E. (Pergamon Press, 1976)

The high-titanium mare basalts show a wide diversity of textures and paragenetic sequences. The order of appearance of ilmenite and pyroxene is shown to be very sensitive to oxygen fugacity within the lunar range, using ...
Sulfur in the Apollo 17 basalts and their source regions

Gibson, Everett K.; Usselman, Thomas M.; Morris, Richard V. (Pergamon Press, 1976)

Thirty-two Apollo 17 mare basalts have been analyzed for their total sulfur and metallic iron abundances.

Browsing LPI Contributions by Author "Usselman, Thomas M."

Browsing LPI Contributions by Author "Usselman, Thomas M."

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