Chemical aspects of agglutinate formation - Relationships between agglutinate composition and the composition of the bulk soilAttention is centered on the nature and intensity of geochemical fractionation accompanying agglutination of several size fractions of the immature Apollo-16 soil sample 67460, from North Ray Crater. The soil features coarse mean grain size about 150 microns, low (20 wt.%) magnetic agglutinate content, and a bimodal grain size distribution. The magnetic fraction included both agglutinates and magnetic non-agglutinates (glass-free microbreccias with 30-60 micron native FeNi grains hosted in a matrix of pyroxene, ilmenite, and olivine). The separation process residue contained nonmagnetic agglutinates with compositions near pure plagioclase. The magnetic agglutinate fraction appears selectively enriched in ferromagnesian elements to the partial exclusion of plagioclase elements. Agglutinate glass chemistry based solely on magnetic separation is deprecated on the basis of the results.
Document ID
19770051822
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Via, W. N. (Tennessee Univ. Knoxville, TN, United States)
Taylor, L. A. (Tennessee, University Knoxville, Tenn., United States)