Thermal history and origin of the IVB iron meteorites and their parent body

  title={Thermal history and origin of the IVB iron meteorites and their parent body},
  author={Jijin Yang and Joseph I. Goldstein and J. R. Michael and Paul G. Kotula and Edward R. D. Scott},
We have determined metallographic cooling rates of 9 IVB irons by measuring Ni gradients 3 lm or less in length at kamacite–taenite boundaries with the analytical transmission electron microscope and by comparing these Ni gradients with those derived by modeling kamacite growth. Cooling rates at 600–400 C vary from 475 K/Myr at the low-Ni end of group IVB to 5000 K/Myr at the high-Ni end. Sizes of high-Ni particles in the cloudy zone microstructure in taenite and the widths of the tetrataenite… CONTINUE READING


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