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Exsolution in Iron Meteorites. Bands of kamacite (Fe-Ni metal low in Ni) formed by exsolution in taenite, Fe-Ni higher in Ni. The two phases have different crystal structures. Kamacite exsolved along octahedral planes in taenite. IVA Iron Meteorite, Gibeon.

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exsolution in iron meteorites
Exsolution in Iron Meteorites
  • Bands of kamacite (Fe-Ni metal low in Ni) formed by exsolution in taenite, Fe-Ni higher in Ni.
  • The two phases have different crystal structures.
  • Kamacite exsolved along octahedral planes in taenite.

IVA Iron Meteorite, Gibeon

Photo by Jeffrey Gillis-Davis, U. of Hawaii

COSMOCHEMISTRY iLLUSTRATED

cooling rates
Cooling Rates

Iron-Nickel Phase Diagram

Growth of Kamacite

COSMOCHEMISTRY iLLUSTRATED

cooling rates1
Cooling Rates

Matching the measured profile with calculated profiles indicates that the cooling rate of this sample is 1000 K/My.

In total, iron meteorite cooling rates range from about 1 to almost 10,000 K/My

COSMOCHEMISTRY iLLUSTRATED

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