Chemical zoning and diffusion of Ca, Al, Mn, and CR in olivine of springwater pallasite

Details Chemical zoning and diffusion of Ca, Al, Mn, and CR in olivine of springwater pallasite Chemical zoning and diffusion of Ca, Al, Mn, and CR in olivine of springwater pallasite

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1573z&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1573-1574 (SEE N94-20636 05-91

Computer Science

3

Aluminum, Calcium, Chromium, Diffusion, Inhomogeneity, Manganese, Meteoritic Composition, Olivine, Stony-Iron Meteorites, Chemical Composition, Grain Boundaries, Metamorphism (Geology), Meteoritic Microstructures, Spatial Distribution

Scientific paper

The pallasites, consisting mainly of Fe-Ni metal and olivine, are thought to represent the interior of a planetary body which slowly cooled from high temperature. Although the olivines are nearly homogeneous, ion microprobe studies revealed variations of Ca, Ti, Co, Cr, and Ni near grain edges. These variations were thought to represent diffusion in response to falling temperature of the parent body. Pallasite cooling rates have been estimated based on kamacite taenite textures but results differ by x100. In principle elemental profiles in olivine can allow estimates of cooling rate if diffusion coefficients are known; in addition, given a cooling rate, diffusion coefficients could be derived. Data are presented which show that apparent diffusion profiles can be measured for Al, Ca, Cr, and Mn which qualitatively agree with expected diffusion rates and have the potential of providing independent estimates of pallasite cooling rates.

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