Plessite formation by discontinuous precipitation reaction from gamma-Fe,Ni in Richardton /H5/ ordinary chondrite

Details Plessite formation by discontinuous precipitation reaction from gamma-Fe,Ni in Richardton /H5/ ordinary chondrite Plessite formation by discontinuous precipitation reaction from gamma-Fe,Ni in Richardton /H5/ ordinary chondrite

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.301..322g&link_type=abstract

Nature, vol. 301, Jan. 27, 1983, p. 322-324.

Computer Science

3

Chondrites, Iron Meteorites, Meteoritic Composition, Precipitation (Chemistry), Face Centered Cubic Lattices, Grain Boundaries, Kamacite, Metallicity, Meteoritic Microstructures, Nickel Compounds, Phase Transformations, Shock Heating, Solid Solutions

Scientific paper

A discontinuous precipitation reaction in zoned gamma-Fe,Ni (taenite) to produce plessite is described as a complement to the alpha yields alpha+gamma precipitation reactions previously observed in the Richardton H-group chondrite. The discontinuous precipitations involve the formation of two or more stable phases behind a grain boundary that migrates into a supersaturated solid-solution. The process is considered as a mechanism for producing rapid diffusion paths in chondrites, and subsequent formation of the structures detected. Analysis of the discontinuous plessitic transformations in the Richardton chondrite indicate nucleation and inward growth occurring in high Ni, metal silicate grain boundary regions of the zoned gamma-taenite grains. The heating source is discussed, together with laboratory-produced alpha yields alpha+gamma and gamma yields gamma+alpha reactions in Fe,Ni alloys, resulting in structures similar to those in the chondrite, and taking place at 350 C.

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