Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nasa.reptq....s&link_type=abstract
Final Report, Feb. 1977 - Sep. 1982 National Aeronautics and Space Administration. Lyndon B. Johnson Space Center, Houston, TX.
Physics
Crystallography, Electron Microscopy, Feldspars, Lunar Geology, Physical Chemistry, Planetary Geology, Chemical Analysis, Crystallization, Magma, Photomicrography, Statistical Analysis
Scientific paper
Natural and experimentally grown zoned plagioclase feldspars were examined by electron microprobe. The analyses revealed discontinuous, sector, and oscillary chemical zoning superimposed on continuous normal or reverse zoning trends. Postulated mechanisms for the origin of zoning are based on either physical changes external to the magma (P, T, H2O saturation) or kinetic changes internal to the magma (diffusion, supersaturation, growth rate). Comparison of microprobe data on natural zoned plagioclase with zoned plagioclase grown in controlled experiments show that it may be possible to distinguish zonal development resulting from physio-chemical changes to the bulk magma from local kinetic control on the growth of individual crystals.
Lofgren Gary E.
Smith Randall K.
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