Engineering topics
Publications and source records attributed to McCallum, I. S..
Sample 67215c is a ferroan anorthosite clast with an age of 4.4 Ga and a positive Nd. The sample has a well preserved microcumulate texture. Relatively rapid cooling rates coupled with preserved pigeonite are consistent with a shallow (<1 km) origin. Additional information is contained in the original extended abstract.
Pasamonte is an unequilibrated eucrite with finely exsolved (nanometer scale) pigeonites and augites showing a primary magmatic zoning trend. Fractured grains show a unique pattern of zoning consistent with metasomatism by a Fe-rich fluid/melt. Additional information is contained in the original extended abstract.
Fe-Mg site occupancy determinations of orthopyroxene from troctolite 76535 yield closure temperatures of ordering of 500-550 C and cooling rates of 1-10 C per year corresponding to shallow burial. 76535 was excavated from deep lunar crust before it had cooled to approx. 550 C. Additional information is contained in the original extended abstract.
Nonmare rock types known from lunar sample studies are placed in a global context using results from recent remote-sensing missions and constraints based on sample studies, including thermobarometric, geochemical, and isotopic data. Additional information is contained in the original extended abstract.
Equilibrated eucrite, Haraiya, shows a range of textures with sharp boundaries between textural domains. However, calculations show a uniform cooling rate indicating a three-stage history of magmatic crystallization, brecciation, and thermal metamorphism. Additional information is contained in the original extended abstract.