Formational history of lunar rocks - Applications of experimental geochemistry of the opaque mineralsExperimental data on the cooling histories of lunar rocks are presented along with a descriptive mineralogy of certain opaque minerals in Apollo 17 samples. Lunar rocks having Zr partitionings of coexisting ilmenite and ulvospinel indicative of high-temperature equilibrium (above 1000 C) appear to have cooled rapidly to temperatures below 800-900 C. The Ti content of troilite coexisting with ilmenite can be used to differentiate rock fragments which are mineralogically and texturally similar. It is found that Cr and Mg partitionings between coexisting armalcolite and ilmenite vary notably between rocks so that they can be used to distinguish otherwise similar samples. The spinels are analyzed as varieties of chromian ulvospinel and titanian chromite.
Document ID
19750055505
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Taylor, L. A. (Tennessee, University Knoxville, Tenn., United States)
Williams, K. L. (Stanford University Stanford, Calif., United States)