Browsing LPI Contributions by Author "Lofgren, Gary E."

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Catalog of lunar mare basalts greater than 40 grams. Part 1, major and trace chemistry, with megascopic descriptions and rock and thin section photographs

Lofgren, Gary E.; Lofgren, Ellen M. (Lyndon B. Johnson Space Center, 1981-08)

Megascopic descriptions of 133 basaltic rocks returned from the Moon are presented along with photographs of each rock and its thin section, if available. The major and trace element chemistry of each is included wherever ...
Dynamic crystallization of a eucrite basalt

Walker, David, 1946-; Powell, M. A.; Lofgren, Gary E.; Hays, J. F. (Pergamon Press, 1978)

Crystallization textures produced experimentally from eucrite Stannern show variations as a function of initial melting temperature (T 0) and linear cooling rate.
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 ...
Nucleation and growth of plagioclase and the development of textures in a high-alumina basaltic melt

Nabelek, Peter I.; Taylor, Lawrence A.; Lofgren, Gary E. (Pergamon Press, 1978)

Dynamic crystallization experiments were conducted in order to determine the conditions necessary to produce poikilitic, intersertal and subophitic textures from a plagioclase-rich basaltic melt.
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 ...
Relative cooling rates of mare basalts at the Apollo 12 and 15 sites as estimated from pyroxene exsolution data

Takeda, Hiroshi; Miyamoto, Masamichi; Ishii, Teruaki; Lofgren, Gary E. (Pergamon Press, 1975)

X-ray single-crystal diffraction studies, supplemented by electron microprobe analyses of core pigeonites and rim augites from rocks 12031, 15085, 15475, and 15495, have been used to suggest cooling rates for these and ...

Browsing LPI Contributions by Author "Lofgren, Gary E."

Browsing LPI Contributions by Author "Lofgren, Gary E."

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