Cooling rate of chondrules from diffusion profiles in relict olivine grains

Stockdale, Shannon; Franchi, Ian; Morgan, Dan; Anand, Mahesh and Grady, Monica (2018). Cooling rate of chondrules from diffusion profiles in relict olivine grains. In: LPI Contribution(2067).

URL: https://www.hou.usra.edu/meetings/metsoc2018/pdf/6...

Abstract

The cooling rates of chondrules are one of the important constraints on chondrule formation and can be used to distinguish between competing chondrule formation mechanisms. Proposed mechanisms range from shockwaves in the solar nebula to impacts between planetesimals. Dynamic crystallisation experiments are the most widely cited methods of determining chondrule cooling rates and this indirect method has provided cooling rates from 1 to 3000 Kh-1. In order to assess whether this is a true representation of chondrule cooling rates, it should be validated or better constrained by using a more direct method. Modelling of diffusion profiles observed across the boundary between forsteritic- olivine relict grains and more fayalitic overgrowth provides a more direct approach to determining chondrule cooling rates.

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