AN EQUATION FOR THE DETERMINATION OF IRON‐METEORITE COOLING RATES | Zendy

Wasson John T. | Zendy

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AN EQUATION FOR THE DETERMINATION OF IRON‐METEORITE COOLING RATES

Author(s) -

Wasson John T.

Publication year - 1971

Publication title -

meteoritics

Language(s) - English

Resource type - Journals

eISSN - 1945-5100

pISSN - 0026-1114

DOI - 10.1111/j.1945-5100.1971.tb00105.x

Subject(s) - kamacite , range (aeronautics) , rate equation , meteorite , analytical chemistry (journal) , chemistry , materials science , physics , kinetics , chondrite , environmental chemistry , composite material , quantum mechanics , astronomy

The Goldstein‐Short graph for the determination of ironmeteorite cooling rates from kamacite bandwidths and Ni concentrations has been approximated by the equation: log CR = −2.040 log BW — 8.940 log Ni + 8.700 where the cooling rate, CR, is in units of°K/m.y., the bandwidth, BW, in units of mm, and Ni concentration is in weight percent. The equation reproduces the Goldstein‐Short values to within ±7% within the Ni concentration range 7 to 14%, which includes most octahedrites. The discrepancy between the graphical or analytical cooling‐rate estimations and those estimated from microprobe data is a factor of 2.1 at 1σ.

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