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Www.psrd.hawaii.edu/April07/irons.html When Worlds Really Did Collide Iron meteorite cooling rates –Compositional zoning –Size of intergrowths Intergrowths.

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Presentation on theme: "Www.psrd.hawaii.edu/April07/irons.html When Worlds Really Did Collide Iron meteorite cooling rates –Compositional zoning –Size of intergrowths Intergrowths."— Presentation transcript:

1 www.psrd.hawaii.edu/April07/irons.html When Worlds Really Did Collide Iron meteorite cooling rates –Compositional zoning –Size of intergrowths Intergrowths in taenite “cloudy zone” Zoning in taenite

2 www.psrd.hawaii.edu/April07/irons.html When Worlds Really Did Collide Cooling rates of group IVA irons (fourth largest group) range over a factor of almost 100 Implies cooling of a metallic core with little or no rocky insulation How do we produce a huge (300 km) blob of molten metal?

3 www.psrd.hawaii.edu/April07/irons.html When Worlds Really Did Collide Collisions of molten planetesimals may be the answer Consistent with dynamical models of planetary accretion


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