The cooling histories of Copiapo and Landes (IA) irons
1979; Elsevier BV; Volume: 40; Issue: 3 Linguagem: Inglês
10.1016/0019-1035(79)90042-3
ISSN1090-2643
AutoresY. Benkheiri, P. Pellas, D. Störzer,
Tópico(s)Metallurgical Processes and Thermodynamics
ResumoThe cooling rate of one silicate inclusion from Copiapo (IA iron) was determined by means of the multiple fission-track-detector method [P. Pellas and D. Storzer, 1977, in Comets, Asteroids, Meteorites (A. H. Delsemme, Ed.), pp. 335–362, University of Toledo]. The preliminary value comes to 1.1−0.5+0.6°C/my for the temperature range 30–350°C. Within the limits of errors this cooling rate agrees with the less precise value of 0.9−0.5+0.8°C/my obtained for one inclusion from Landes (IA). An extrapolation of the fission-track cooling rate through the temperature interval 500–600°C gives a value of ∼4°C/my in good agreement with metallographic data for IA irons (2–4°C/my).
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